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Smith RJ, Chen Y, Lafleur CI, Kaur D, Bede JC. Effect of sublethal concentrations of the bioinsecticide spinosyn treatment of Trichoplusia ni eggs on the caterpillar and its parasitoid, Trichogramma brassicae. PEST MANAGEMENT SCIENCE 2024; 80:2965-2975. [PMID: 38298017 DOI: 10.1002/ps.8004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 01/18/2024] [Accepted: 01/30/2024] [Indexed: 02/02/2024]
Abstract
BACKGROUND Integrated Pest Management (IPM) seeks to combine multiple management strategies for optimal pest control. One method that is successfully employed in IPM is the use of beneficial organisms. However, in severe circumstances when pest insects exceed threshold limits, insecticides may still need to be implemented. Thus, understanding the effects of insecticides on biocontrol agents, such as parasitoid wasps, is paramount to ensure sustainable agroecosystems. Sublethal effects of the bioinsecticide spinosyn, a mixture of the bacterial Saccharopolyspora spinosa (Mertz and Yao) fermentation products spinosyn A and D, on eggs of Trichoplusia ni (Hübner), a cruciferous crop pest, and its egg parasitoid Trichogramma brassicae (Bezdenko) was investigated. RESULTS The LC50 for spinosyn A and D (dissolved in ethanol) on T. ni eggs is 54 ng mL-1. Transcriptomics on caterpillars (1st and 3rd instars) that hatched from eggs treated with sublethal concentrations of spinosyn identified the upregulation of several genes encoding proteins that may be involved in insecticide resistance including detoxification enzymes, such as cytochrome P450s, glutathione S-transferases and esterases. Sublethal T. ni egg treatments did not affect parasitoid emergence, however, there was a marked increase in the size of T. brassicae hind tibia and wings that emerged from spinosyn-treated eggs. CONCLUSIONS For the caterpillar, treatment of eggs with sublethal concentrations of spinosyn may induce insecticide resistance mechanisms. For the parasitoids, their increased size when reared in spinosyn-treated eggs suggests that the emerged wasps may have higher performance. © 2024 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Ryan J Smith
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Canada
| | - Yinting Chen
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Canada
| | | | - Diljot Kaur
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Canada
| | - Jacqueline C Bede
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Canada
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Dang YQ, Duan JJ, Li AY. Parasitoid-induced changes in metabolic rate and feeding activity of the emerald ash borer (Coleoptera: Buprestidae): implications for biological control. Sci Rep 2023; 13:22663. [PMID: 38114572 PMCID: PMC10730522 DOI: 10.1038/s41598-023-50147-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 12/15/2023] [Indexed: 12/21/2023] Open
Abstract
Parasitoid-host interactions form the foundation of biological control strategies against many agriculture and forest insect pests. The emerald ash borer (EAB), Agrilus planipennis (Coleoptera: Buprestidae), is a serious invasive pest of ash (Fraxinus spp.) trees in North America. Tetrastichus planipennisi (Hymenoptera: Eulophidae) is a gregarious, koinobiont endoparasitoid, attacking late (3rd to 4th) instars of EAB larvae, which feed in the live phloem of ash trunks or branches, making serpentine-like galleries filled with larval frass. In the present study, we tested the hypothesis that T. planipennisi regulates the host metabolism and feeding activity to optimize its offspring development and fitness. We first compared the respiration rate of parasitized and unparasitized host larvae at different times after parasitism, and then measured feeding activity of both parasitized and unparasitized host larvae inside their feeding galleries. Although parasitized host larvae increased metabolic rate and feeding activity in the first few days of parasitism, T. planipennisi parasitism induced an overall reduction of the metabolic rate and decrease in feeding activity of parasitized host larvae over their development period. In addition, there was a negative relationship between feeding activity of parasitized hosts and brood sizes of the parasitoid progeny-i.e., the more parasitoid progeny a host larva received, the less feeding activity the host had. These findings suggest that T. planipennisi has limited ability to optimize its offspring development and fitness through regulations of the host metabolism and feeding activity and its parasitism reduces feeding damage of parasitized EAB larvae to infested ash trees.
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Affiliation(s)
- Ying-Qiao Dang
- Agriculture Research Service, Beneficial Insects Introduction Research Unit, U.S. Department of Agriculture, Newark, DE, 19713, USA
- Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, 100091, China
| | - Jian J Duan
- Agriculture Research Service, Beneficial Insects Introduction Research Unit, U.S. Department of Agriculture, Newark, DE, 19713, USA.
| | - Andrew Y Li
- Agriculture Research Service, Invasive Insect Biocontrol and Behavior Laboratory, U.S. Department of Agriculture, Beltsville, MD, 20705, USA
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Nath A, Gadratagi BG, Maurya RP, Ullah F, Patil NB, Adak T, Govindharaj GPP, Ray A, Mahendiran A, Desneux N, Chandra Rath P. Sublethal phosphine fumigation induces transgenerational hormesis in a factitious host, Corcyra cephalonica. PEST MANAGEMENT SCIENCE 2023; 79:3548-3558. [PMID: 37183345 DOI: 10.1002/ps.7542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 03/31/2023] [Accepted: 05/06/2023] [Indexed: 05/16/2023]
Abstract
BACKGROUND The rice moth, Corcyra cephalonica (Stainton) (Lepidoptera: Pyralidae) is a pest of stored grains and widely used as a factitious host during the mass rearing of several natural enemies of crop pests. Hormesis is well-documented in pest insects, to some extent in natural enemies of pests. RESULTS We report transgenerational stimulatory effects of the widely used fumigant, phosphine. The study reports the consequences of sublethal, low lethal and median lethal concentrations (LC5 , LC25 and LC50 ) and untreated control for two sequential generations of the species (G1 to G2 ). In this study, we investigated the life-history traits, nutrient reserves (protein, lipid and carbohydrate) and larval gut microbiome (using 16 s rRNA V3-V4 metagenomics sequencing) of C. cephalonica. Stimulatory effects were observed for various biological traits of C. cephalonica, notably adult longevity, emergence and increased egg hatchability when exposed to LC5 of phosphine. The total protein, lipid and carbohydrate contents of C. cephalonica also were found to be significantly increased by LC5 in both generations. The microbial diversity of LC5 treated larval gut was higher and found to be different from the rest of the treatments. This is the first report showing hormesis to a fumigant insecticide. CONCLUSION Our findings increase knowledge on the interaction between hormesis, nutrient reserves and gut bacteria in C. cephalonica exposed to insecticides. Overall, the present study establishes phosphine-induced hormesis at LC5 in the host C. cephalonica, which might help improve the quality of mass rearing of various natural enemies. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Anshuman Nath
- Department of Entomology, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, India
- Crop Protection Division, ICAR-National Rice Research Institute, Cuttack, Odisha, India
| | | | - Ravi Prakash Maurya
- Department of Entomology, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, India
| | - Farman Ullah
- Department of Plant Biosecurity, College of Plant Protection, China Agricultural University, Beijing, China
- Key Laboratory of Surveillance and Management for Plant Quarantine Pests, Ministry of Agriculture and Rural Affairs, Beijing, P. R. China
| | - Naveenkumar B Patil
- Crop Protection Division, ICAR-National Rice Research Institute, Cuttack, Odisha, India
| | - Totan Adak
- Crop Protection Division, ICAR-National Rice Research Institute, Cuttack, Odisha, India
| | | | - Aishwarya Ray
- Crop Protection Division, ICAR-National Rice Research Institute, Cuttack, Odisha, India
- Department of Entomology, College of Agriculture, Indira Gandhi Krishi Vishwavidyalaya, Raipur, India
| | - Annamalai Mahendiran
- Crop Protection Division, ICAR-National Rice Research Institute, Cuttack, Odisha, India
| | | | - Prakash Chandra Rath
- Crop Protection Division, ICAR-National Rice Research Institute, Cuttack, Odisha, India
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Li ZX, Ji MQ, Zhang C, Yang YB, Chen ZZ, Zhao HP, Xu YY, Kang ZW. The Influence of Host Aphids on the Performance of Aphelinus asychis. INSECTS 2022; 13:795. [PMID: 36135496 PMCID: PMC9500855 DOI: 10.3390/insects13090795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/24/2022] [Accepted: 08/30/2022] [Indexed: 06/16/2023]
Abstract
The aphid parasitoid Aphelinus asychis Walker is an important biological control agent against many aphid species. In this study, we examined whether the rearing host aphid species (the pea aphid, Acyrthosiphon pisum and the grain aphid, Sitobion avenae) affect the performance of A. asychis. We found that A. pisum-reared A. asychis showed a significantly larger body size (body length and hind tibia length) and shorter developmental time than S. avenae-reared A. asychis. There was no difference in the sex ratio between them. The longevity of A. pisum-reared A. asychis was also significantly longer than that of S. aveane-reared A. asychis. Furthermore, A. pisum-reared A. asychis presented stronger parasitic capacity and starvation resistance than S. aveane-reared A. asychi. In addition, host aphid alteration experiments showed that A. asychis only takes two generations to adapt to its new host. Taken together, these results revealed that A. pisum is a better alternative host aphid for mass-rearing and releasing of A. asychis. The body size plasticity of A. asychis is also discussed.
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Affiliation(s)
- Zhen-Xiang Li
- College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China
| | - Meng-Qi Ji
- School of Life Science, Institutes of Life Science and Green Development, Hebei University, Baoding 071002, China
| | - Chi Zhang
- Rural Energy and Environment Agency, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
| | - Yi-Bing Yang
- Jinxiang County Agriculture and Rural Bureau, Jining 272200, China
| | - Zhen-Zhen Chen
- College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China
| | - Hai-Peng Zhao
- College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China
| | - Yong-Yu Xu
- College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China
| | - Zhi-Wei Kang
- College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China
- School of Life Science, Institutes of Life Science and Green Development, Hebei University, Baoding 071002, China
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Parra LM, Garcia AG, Alves GR, Magro SR, Parra JRP. Effect of Different Wheat-Based Diets and Corn Meal Addition on Development Parameters of Ephestia kuehniella (Zeller, 1879) (Lepidoptera: Pyralidae). JOURNAL OF INSECT SCIENCE (ONLINE) 2022; 22:10. [PMID: 35596588 PMCID: PMC9123304 DOI: 10.1093/jisesa/ieac029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Indexed: 06/15/2023]
Abstract
The expansion of Integrated Pest Management (IPM), including biological control, has had several positive consequences for the agricultural environment and participants in the production chain. To enable successful operation and applications of biological control, production of insects used for rearing natural enemies (parasitoids and predators) must be optimized to reduce time and costs and improve production both qualitatively and quantitatively. The present study evaluated the effect of wheat varieties, the main component of artificial diets for Ephestia kuehniella, on the reproductive performance and biological parameters of this flour moth, which is used for mass production of Trichogramma spp. (Hymenoptera: Trichogrammatidae) and other parasitoids and predators. Four varieties of wheat were compared: BRS 327, BRS Marcante, BRS Parrudo, and KBR, with and without the addition of corn E. kuehniella reared on 97% BRS 327 wheat flour + 3% nutritional yeast had the best biological parameters and substitution of corn for about half of the wheat increased the number of eggs per female.
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Affiliation(s)
| | - A G Garcia
- ESALQ/USP, Insect Biology Laboratory, Avenida Pádua Dias, 11, Piracicaba, São Paulo, 13418900, Brazil
| | - G R Alves
- Research and Development Department, Koppert Biological Systems Brazil, Via Vicente Verdi, 528, Charqueada, São Paulo, 13515000, Brazil
| | - S R Magro
- Research and Development Department, Koppert Biological Systems Brazil, Via Vicente Verdi, 528, Charqueada, São Paulo, 13515000, Brazil
| | - J R P Parra
- ESALQ/USP, Insect Biology Laboratory, Avenida Pádua Dias, 11, Piracicaba, São Paulo, 13418900, Brazil
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Häner N, Amiresmaeili N, Stähli N, Romeis J, Collatz J. Overwintering of two pupal parasitoids of Drosophila under natural conditions. J Therm Biol 2022; 106:103231. [DOI: 10.1016/j.jtherbio.2022.103231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 03/10/2022] [Accepted: 03/26/2022] [Indexed: 10/18/2022]
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Torres-Moreno R, Víctor J, Moya-Raygoza G. Morphological variation of the parasitic wasp Paracentrobia subflava (Hymenoptera: Trichogrammatidae) emerged from different leafhopper species. ZOOL ANZ 2021. [DOI: 10.1016/j.jcz.2021.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Farahani HK, Ashouri A, Abroon P, Pierre JS, van Baaren J. Wolbachia manipulate fitness benefits of olfactory associative learning in a parasitoid wasp. J Exp Biol 2021; 224:269008. [PMID: 34086908 DOI: 10.1242/jeb.240549] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 04/20/2021] [Indexed: 11/20/2022]
Abstract
Upon encountering a host, a female parasitoid wasp has to decide whether to learn positive or negative cues related to the host. The optimal female decision will depend on the fitness costs and benefits of learned stimuli. Reward quality is positively related to the rate of behavioral acquisition in processes such as associative learning. Wolbachia, an endosymbiotic bacterium, often plays an impressive role in the manipulation of its arthropod host's biology. Here, we studied the responses of two natural Wolbachia infected/uninfected Trichogramma brassicae wasp populations to theoretically high- and low-reward values during a conditioning process and the consequences of their responses in terms of memory duration. According to our results, uninfected wasps showed an attraction response to high-value rewards, but showed aversive learning in response to low-value rewards. The memory span of uninfected wasps after conditioning by low-value rewards was significantly shorter than that for high-value rewards. As our results revealed, responses to high-quality hosts will bring more benefits (bigger size, increased fecundity and enhanced survival) than those to low-quality hosts for uninfected wasps. Infected wasps were attracted to conditioned stimuli with the same memory duration after conditioning by both types of hosts. This was linked to the fact that parasitoids emerging from both types of hosts present the same life-history traits. Therefore, these hosts represent the same quality reward for infected wasps. According to the obtained results, it can be concluded that Wolbachia manipulates the learning ability of its host, resulting in the wasp responding to all reward values similarly.
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Affiliation(s)
- Hossein Kishani Farahani
- Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
| | - Ahmad Ashouri
- Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
| | - Pouria Abroon
- Department of Plant Protection, College of Agriculture, University of Bu Ali, Hamadan, Iran
| | - Jean-Sebastien Pierre
- University of Rennes 1, UMR-CNRS 6553 EcoBio, Avenue du Général Leclerc, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Joan van Baaren
- University of Rennes 1, UMR-CNRS 6553 EcoBio, Avenue du Général Leclerc, Campus de Beaulieu, 35042 Rennes Cedex, France
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Sampaio MV, Franco GM, Lima DT, Oliveira ARC, Silva PF, Santos ALZ, Resende AVM, Santos FAA, Girão LVC. Plant Silicon Amendment Does Not Reduce Population Growth of Schizaphis graminum or Host Quality for the Parasitoid Lysiphlebus testaceipes. NEOTROPICAL ENTOMOLOGY 2020; 49:745-757. [PMID: 32445112 DOI: 10.1007/s13744-020-00775-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
Interactions between different pest control methods can affect Integrated Pest Management efficiency. This study sought to evaluate (1) if Si accumulation is related to the level of constitutive resistance in sorghum genotypes, (2) the level of Si induces resistance by antibiosis in sorghum genotypes with different levels of constitutive resistance to Schizaphis graminum (Rondani) (reared individualized or in colonies), and (3) the fitness of Lysiphlebus testaceipes (Cresson) in aphids reared on Si-treated and untreated plants. Several experiments were conducted under greenhouse conditions, using sorghum genotypes with different levels of resistance grown in pots with or without the addition of Si to the soil. The susceptible (BR007B), moderately resistant (GB3B), and highly resistant (TX430XGR111) genotypes all absorbed more Si when it was added to the soil compared with when it was not amended. However, the final Si content of treated plants was not related to the level of constitutive resistance among treated genotypes. While Si soil application did reduce the fecundity of individualized aphids reared on the susceptible and moderately resistant sorghum plants, it did not reduce populational growth of aphid colonies, independent of the level of plant's constitutive resistance. Parasitoid (L. testaceipes) had higher weight when reared from aphids fed on plants with added Si. Sorghum × constitutive resistance × S. graminum interactions were affected by plant Si content only for individualized aphids but not for aphid colonies. Sorghum × S. graminum × L. testaceipes interactions suggest that Si can have, overall, a positive effect on the biological control of S. graminum.
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Affiliation(s)
- M V Sampaio
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil.
| | - G M Franco
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
- Entomology Dept, Louisiana State Univ, Baton Rouge, LA, USA
| | - D T Lima
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
| | - A R C Oliveira
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
| | - P F Silva
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
| | - A L Z Santos
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
- School of Agricultural and Veterinarian Sciences, São Paulo State Univ (Unesp), Jaboticabal, Brasil
| | - A V M Resende
- Institute of Agricultural Sciences, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
| | - F A A Santos
- Institute of Biotechnology, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
| | - L V C Girão
- College of Veterinary Medicine, Federal Univ of Uberlândia, Uberlândia, MG, Brasil
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Amiresmaeili N, Romeis J, Collatz J. Cold tolerance of the drosophila pupal parasitoid Trichopria drosophilae. JOURNAL OF INSECT PHYSIOLOGY 2020; 125:104087. [PMID: 32634433 DOI: 10.1016/j.jinsphys.2020.104087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 05/11/2020] [Accepted: 06/30/2020] [Indexed: 06/11/2023]
Abstract
Trichopria drosophilae (Perkins) (Hymenoptera: Diapriidae) is a pupal parasitoid of drosophila flies recorded from several parts of the world. It is currently considered for augmentative biological programs to control the severe agricultural pest Drosophila suzukii (Matsumura) (Diptera: Drosophilidae). Since D. suzukii has invaded regions that experience zero and sub-zero winter temperatures, cold tolerance of the parasitoid is an important aspect to consider. We characterized low temperature tolerance and overwintering capacity of a colony of T. drosophilae collected in Northern Switzerland. We used copper-constantan thermocouples to determine the supercooling point and pre-freeze mortality. Moreover, we subjected honey-fed and unfed adult T. drosophilae as well as developing stages within their drosophila host to short- and long-term acclimation conditions and assessed the duration of their survival at low temperatures. Finally, we exposed adult and sub-adult stages to winter conditions in a semi-field experiment and evaluated their survival. We found that T. drosophilae is chill susceptible like D. suzukii, but adults froze and survived at colder temperatures than those reported for D. suzukii. Adult parasitoids could tolerate several days of exposure to sub-zero temperatures and could reproduce afterwards, whereas sub-adult stages could survive longer periods under these conditions. The provision of honey and water enhanced the survival of adults and long-term acclimation led to longer survival in all stages. The semi-field experiment supported the results of the laboratory tests. Based on these results we suggest that in Central Europe, T. drosophilae survives winters mainly in developing stages but adults are likely able to tolerate short periods of low spring temperatures.
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Affiliation(s)
- Nasim Amiresmaeili
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, 8046 Zurich, Switzerland; University of Bern, Institute of Ecology and Evolution, Baltzerstrasse 6, 3012 Bern, Switzerland
| | - Jörg Romeis
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, 8046 Zurich, Switzerland; University of Bern, Institute of Ecology and Evolution, Baltzerstrasse 6, 3012 Bern, Switzerland
| | - Jana Collatz
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, 8046 Zurich, Switzerland.
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del Pino M, Gallego JR, Hernández Suárez E, Cabello T. Effect of Temperature on Life History and Parasitization Behavior of Trichogramma achaeae Nagaraja and Nagarkatti (Hym.: Trichogrammatidae). INSECTS 2020; 11:insects11080482. [PMID: 32751342 PMCID: PMC7469157 DOI: 10.3390/insects11080482] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/25/2020] [Accepted: 07/27/2020] [Indexed: 11/22/2022]
Abstract
Trichogramma achaeae Nagaraja and Nagarkatti (Hymenoptera: Trichogrammatidae) is currently used as biological control agent for several lepidopteran pests. Knowledge of thermal requirements is essential to optimize its rearing procedures and inundative releases. The biological characteristics and two-sex life table parameters of T. achaeae were determined at five constant temperatures (15, 20, 25, 30, and 35 °C) using Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) eggs. T. achaeae was able to develop and survive from 15 °C to 30 °C, but not at 35 °C. Temperature significantly affected the preadult development time and adult longevity, decreasing when temperature increased from 15 °C to 30 °C. Temperature significantly altered the sex ratio, being female biased between 15 °C and 25 °C. Age-stage, two-sex life table analysis indicated that net reproductive rate (R0) was highest at 20 °C. Both the intrinsic rate of increase (r) and finite rate of increase (λ) increased with increasing temperature, while the mean generation time (T) decreased significantly. In addition, functional response of T. achaeae was studied, being significantly affected by temperature and host egg density, displaying a Holling type-I at 15 °C and a Holling type-II at 25 °C. The relevance of these results is discussed for the use of T. achaeae as biological control agent.
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Affiliation(s)
- Modesto del Pino
- Andalusian Institute for Research and Training in Agriculture, Fishery, Food and Organic Production (IFAPA), Málaga Centre, Cortijo de la Cruz s/n, 29140 Churriana, Málaga, Spain;
| | - Juan Ramón Gallego
- Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology (CIAMBITAL), Agrifood Campus of International Excellence (CEIA3), University of Almeria, Ctra. de Sacramento, s/n, 04120 La Cañada, Almeria, Spain;
| | - Estrella Hernández Suárez
- Canarian Institute for Agricultural Research (ICIA), P.B. 60, ES 38200 La Laguna, Santa Cruz de Tenerife, Canary Islands, Spain;
| | - Tomás Cabello
- Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology (CIAMBITAL), Agrifood Campus of International Excellence (CEIA3), University of Almeria, Ctra. de Sacramento, s/n, 04120 La Cañada, Almeria, Spain;
- Correspondence: ; Tel.: +34-950-015-001
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Where you come from matters: temperature influences host-parasitoid interaction through parental effects. Oecologia 2020; 192:853-863. [PMID: 32056022 DOI: 10.1007/s00442-020-04613-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 01/30/2020] [Indexed: 10/25/2022]
Abstract
Temperature alters host suitability for parasitoid development through direct and indirect pathways. Direct effects depend on ambient temperatures experienced by a single host individual during its lifetime. Indirect effects (or parental effects) occur when thermal conditions met by a host parental generation affect the way its offspring will interact with parasitoids. Using the complex involving eggs of the moth Lobesia botrana as hosts for the parasitoid Trichogramma cacoeciae, we developed an experimental design to disentangle the effects of (1) host parental temperature (temperature at which the host parental generation developed and laid host eggs) and (2) host offspring temperature (temperature at which host eggs were incubated following parasitism, i.e. direct thermal effects) on this interaction. The host parental generation was impacted by temperature experienced during its development: L. botrana females exposed to warmer conditions displayed a lower pupal mass but laid more host eggs over a 12-h period. Host parental temperature also affected the outcomes of the interaction. Trichogramma cacoeciae exhibited lower emergence rates but higher hind tibia length on emergence from eggs laid under warm conditions, even if they were themselves exposed to cooler temperatures. Such indirect thermal effects might arise from a low nutritional quality and/or a high immunity of host eggs laid in warm conditions. By contrast with host parental temperature, offspring temperature (direct thermal effects) did not significantly affect the outcomes of the interaction. This work emphasises the importance of accounting for parental thermal effects to predict the future of trophic dynamics under global warming scenarios.
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Moghaddassi Y, Ashouri A, Bandani AR, Leppla NC, Shirk PD. Effect of Ephestia kuehniella (Lepidoptera: Pyralidae) Larval Diet on Egg Quality and Parasitism by Trichogramma brassicae (Hymenoptera: Trichogrammatidae). JOURNAL OF INSECT SCIENCE (ONLINE) 2019; 19:5535715. [PMID: 31319420 PMCID: PMC6638262 DOI: 10.1093/jisesa/iez076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Indexed: 06/10/2023]
Abstract
Trichogramma spp., among the most common parasitoids used for augmentation biological control, often are mass-reared on eggs of the Mediterranean flour moth, Ephestia kuehniella (Zeller). To evaluate removal of nutritional components from the E. kuehniella larval diet and reduce production costs, colonies were maintained using one of three diets: a standard diet consisting of eight ingredients, a reduced diet containing whole wheat flour, glycerol, and Brewer's yeast, or a third minimal diet of only whole wheat flour. The standard diet sustained the fastest larval development, female pupae with the greatest mass, the highest level of adult emergence, and production of the most eggs per female. Eggs from moths reared as larvae on the standard or reduced diet had equivalent mass, length, and percent hatch. Females from larvae fed the minimal diet produced eggs with the least mass that were shorter and had the lowest percent hatch. Eggs from the three E. kuehniella colonies were exposed separately to Trichogramma brassicae Bezdenko females to determine their acceptance for oviposition. More of the eggs from the standard diet were parasitized by the females, eggs from the reduced and minimal diets being less acceptable. The percent emergence of the parasitoids was the same regardless of diet; however, the largest wasps emerged from the standard diet eggs and a greater proportion of them were females. Consequently, the standard E. kuehniella larval diet resulted in the highest rate of reproduction and robust eggs that produced superior T. brassicae wasps.
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Affiliation(s)
- Yasaman Moghaddassi
- Department of Plant Protection, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
| | - Ahmad Ashouri
- Department of Plant Protection, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
| | - Ali Reza Bandani
- Department of Plant Protection, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
| | - Norman C Leppla
- Entomology and Nematology Department, University of Florida, Gainesville, FL
| | - Paul D Shirk
- USDA-ARS, Center for Medical, Agricultural and Veterinary Entomology (CMAVE), Gainesville, FL
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Skillman VP, Lee JC. Nutrient Content of Brown Marmorated Stink Bug Eggs and Comparisons Between Experimental Uses. JOURNAL OF INSECT SCIENCE 2017; 17:120. [PMCID: PMC5739044 DOI: 10.1093/jisesa/iex098] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 10/30/2017] [Indexed: 06/10/2023]
Abstract
Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), the brown marmorated stink bug (BMSB), has become a major pest. Seven experiments examined the nutrient content of their eggs in the context of female reproductive investment and use for experiments. Among 542 clusters examined, an average egg contained 23.50 ± 0.561 µg lipid, 3.17 ± 0.089 µg glycogen, and 3.08 ± 0.056 µg sugar. Mature eggs within a female’s ovary can make up 61% of her total lipid, 35% of glycogen, and 20% of sugar levels. Eggs obtained from a colony reared on a steady diet are expected to have consistent nutrient content. The age of a parental female only slightly affected the lipid level of oviposited eggs but did not affect glycogen or sugar levels. However, egg nutrient content can differ substantially by the source of the parental females; wild eggs had higher lipid but lower sugar content than colony-produced eggs. Further, the length of time that eggs are frozen influenced egg nutrient content. Freshly laid eggs had higher lipid and lower sugar levels than eggs frozen for 1 or 2 yr. Whether an egg turned grey following removal from cold storage did not affect nutrient content, nor did being frozen within 1 or 3 d of oviposition. The temperature at which eggs were left exposed did not impact egg nutrient content, but glycogen decreased and sugar increased with deployment time. This information combined with how factors affect host selection by natural enemies will help refine future experiments that use BMSB egg clusters.
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Affiliation(s)
- Victoria P Skillman
- Extension Plant Pathology Laboratory, Oregon State University, Hermiston Agricultural Research & Extension Center, Hermiston, OR
- USDA ARS Horticultural Crop Research Unit, Corvallis, OR
| | - Jana C Lee
- USDA ARS Horticultural Crop Research Unit, Corvallis, OR
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Alford L, Kishani Farahani H, Pierre JS, Burel F, van Baaren J. Why is there no impact of the host species on the cold tolerance of a generalist parasitoid? JOURNAL OF INSECT PHYSIOLOGY 2017; 103:71-77. [PMID: 29038015 DOI: 10.1016/j.jinsphys.2017.10.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 10/06/2017] [Accepted: 10/12/2017] [Indexed: 06/07/2023]
Abstract
For generalist parasitoids such as those belonging to the Genus Aphidius, the choice of host species can have profound implications for the emerging parasitoid. Host species is known to affect a variety of life history traits. However, the impact of the host on thermal tolerance has never been studied. Physiological thermal tolerance, enabling survival at unfavourable temperatures, is not a fixed trait and may be influenced by a number of external factors including characteristics of the stress, of the individual exposed to the stress, and of the biological and physical environment. As such, the choice of host species is likely to also have implications for the thermal tolerance of the emerging parasitoid. The current study aimed to investigate the effect of cereal aphid host species (Sitobion avenae, Rhopalosiphum padi and Metopolophium dirhodum) on adult thermal tolerance, in addition to sex and size, of the aphid parasitoids Aphidius avenae, Aphidius matricariae and Aphidius rhopalosiphi. Results revealed no effect of host species on the cold tolerance of the emerging parasitoid, as determined by CTmin and Chill Coma, for all parasitoid species. Host species significantly affected the size of the emerging parasitoid for A. rhopalosiphi only, with individuals emerging from R. padi being significantly larger than those emerging from S. avenae, although this did not correspond to a difference in thermal tolerance. Furthermore, a significant difference in the size of male and female parasitoids was observed for A. avenae and A. matricariae, although, once again this did not correspond to a difference in cold tolerance. It is suggested that potential behavioural thermoregulation via host manipulation may act to influence the thermal environment experienced by the wasp and thus wasp thermal tolerance and, in doing so, may negate physiological thermal tolerance or any impact of the aphid host.
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Affiliation(s)
- Lucy Alford
- UMR 6553 ECOBIO, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cedex, France; Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Davidson Building, Glasgow G12 8QQ, UK.
| | | | - Jean-Sébastien Pierre
- UMR 6553 ECOBIO, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Françoise Burel
- UMR 6553 ECOBIO, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Joan van Baaren
- UMR 6553 ECOBIO, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cedex, France
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