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Rein C, Blumenschein M, Traynor K, Rosenkranz P. Lithium chloride treatments in free flying honey bee colonies: efficacy, brood survival, and within-colony distribution. Parasitol Res 2023; 123:67. [PMID: 38133834 PMCID: PMC10746590 DOI: 10.1007/s00436-023-08084-y] [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: 08/04/2023] [Accepted: 12/03/2023] [Indexed: 12/23/2023]
Abstract
The efficacy of various lithium chloride (LiCl) applications in eradicating the parasitic mite Varroa destructor in honey bee colonies was investigated, with a specific focus on its impact on brood development. In broodless colonies (3 weeks post queen caging), the highest efficacy of 98% was achieved with a 9-day treatment of 2.5 kg of candy spiked with 50 mM LiCl. A shorter 5-day treatment with 2 kg of 50 mM LiCl candy resulted in an efficacy of 78%. In colonies with brood, a repeated short-term application of 4 × 0.5 kg 50 mM LiCl candy yielded an efficacy of 88%. LiCl treatment led to a removal of the first batch of brood reared after release of the queen. However, no long-term effects on colony growth were observed, and the colonies successfully overwintered. Additionally, the study demonstrated that lithium is rapidly distributed among the bees of a colony within 2 days, yet only low concentrations were detected in stored food samples. This suggests that the bees efficiently absorb and distribute lithium within the colony. The harvested honey in the following spring revealed a lithium concentration of 0.1-0.2 mg/kg, which is below naturally occurring lithium levels in honey. Based on these findings, LiCl can be considered an effective and easy-to-apply acaricide in broodless colonies, and even in colonies with brood, it had good efficacy and no long-term effects on colony survival. Further research may be necessary to determine the optimal treatment period for achieving an efficacy over 95%.
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Affiliation(s)
- Carolin Rein
- State Institute of Bee Research, University of Hohenheim, 70599, Stuttgart, Germany.
| | - Marius Blumenschein
- State Institute of Bee Research, University of Hohenheim, 70599, Stuttgart, Germany
| | - Kirsten Traynor
- State Institute of Bee Research, University of Hohenheim, 70599, Stuttgart, Germany
| | - Peter Rosenkranz
- State Institute of Bee Research, University of Hohenheim, 70599, Stuttgart, Germany
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Erdem B, Arslan OC, Sevin S, Gozen AG, Agosto-Rivera JL, Giray T, Alemdar H. Effects of lithium on locomotor activity and circadian rhythm of honey bees. Sci Rep 2023; 13:19861. [PMID: 37963948 PMCID: PMC10646147 DOI: 10.1038/s41598-023-46777-7] [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: 05/18/2023] [Accepted: 11/04/2023] [Indexed: 11/16/2023] Open
Abstract
Lithium has been considered a potential acaricidal agent against the honey bee (Apis mellifera) parasite Varroa. It is known that lithium suppresses elevated activity and regulates circadian rhythms and light response when administered to humans as a primary therapeutic chemical for bipolar disorder and to other bipolar syndrome model organisms, given the crucial role of timing in the bee's foraging activity and the alternating sunlight vs dark colony environment bees are exposed, we explored the influence of lithium on locomotor activity (LMA) and circadian rhythm of honey bees. We conducted acute and chronic lithium administration experiments, altering light conditions and lithium doses to assess LMA and circadian rhythm changes. We fed bees one time 10 μl sucrose solution with 0, 50, 150, and 450 mM LiCl in the acute application experiment and 0, 1, 5, and 10 mmol/kg LiCl ad libitum in bee candy in the chronic application experiment. Both acute and chronic lithium treatments significantly decreased the induced LMA under constant light. Chronic lithium treatment disrupted circadian rhythmicity in constant darkness. The circadian period was lengthened by lithium treatment under constant light. We discuss the results in the context of Varroa control and lithium's effect on bipolar disorder.
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Affiliation(s)
- Babur Erdem
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey.
- Center for Robotics and Artificial Intelligence (ROMER), Middle East Technical University, Ankara, Turkey.
| | - Okan Can Arslan
- Center for Robotics and Artificial Intelligence (ROMER), Middle East Technical University, Ankara, Turkey
| | - Sedat Sevin
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - Ayse Gul Gozen
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | | | - Tugrul Giray
- Department of Biology, University of Puerto Rico, Rio Piedras, Puerto Rico
| | - Hande Alemdar
- Department of Computer Engineering, Middle East Technical University, Ankara, Turkey
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Kolics B, Mátyás K, Solti I, Bacsi Z, Kovács S, Specziár A, Taller J, Kolics É. Efficacy of In Vitro Lithium Chloride Treatments on Dermacentor reticulatus. INSECTS 2023; 14:110. [PMID: 36835679 PMCID: PMC9960498 DOI: 10.3390/insects14020110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 06/18/2023]
Abstract
Dermacentor reticulatus (Fabr., 1794) (Acari: Ixodidae) is parasite that spreads many diseases which are dangerous to humans and animals. Microelement lithium was found to have promising potential against the detrimental bee pest Varroa destructor. Furthermore, its effectiveness was confirmed against Dermanyssus gallinae, a major parasite of poultry, in vitro. In the present study, we investigated whether the efficacy of lithium chloride extends to other parasitic species, such as D. reticulatus. Our results revealed, for the first time, that the effectiveness of lithium chloride extends to D. reticulatus, confirmed to have 100% mortality at a relatively high minimum concentration of 1.38 M in vitro. The 24 h and 48 h median lethal concentration (LC50) values proved to be 0.654 M and 0.481 M, respectively, for this species. Our pilot study may contribute to a better understanding of the properties of lithium ion. Furthermore, it may elicit further studies aiming to reveal whether the different environmental mineral conditions may influence the D. reticulatus population. Further studies might reveal whether lithium has any possible veterinary relevance.
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Affiliation(s)
- Balázs Kolics
- Festetics Bioinnovation Group, Department of Microbiology and Applied Biotechnology, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Kinga Mátyás
- Festetics Bioinnovation Group, Department of Microbiology and Applied Biotechnology, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Izabella Solti
- Festetics Bioinnovation Group, Department of Microbiology and Applied Biotechnology, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Zsuzsanna Bacsi
- Department of Agricultural Economics and Policy, Institute of Agricultural and Food Economics, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Szilvia Kovács
- Department of Wildlife Biology and Management, Institute for Wildlife Management and Nature Conservation, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - András Specziár
- Balaton Limnological Research Institute, H-8237 Tihany, Hungary
| | - János Taller
- Festetics Bioinnovation Group, Department of Microbiology and Applied Biotechnology, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Éva Kolics
- Festetics Bioinnovation Group, Department of Microbiology and Applied Biotechnology, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
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Kolics B, Kolics É, Solti I, Bacsi Z, Taller J, Specziár A, Mátyás K. Lithium Chloride Shows Effectiveness against the Poultry Red Mite ( Dermanyssus gallinae). INSECTS 2022; 13:1005. [PMID: 36354829 PMCID: PMC9694377 DOI: 10.3390/insects13111005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 10/26/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
The poultry red mite (Dermanyssus gallinae) is the main pest of poultry, causing severe problems by being a vector of several animal and human pathogens. The number of miticides is few, and their efficacy in practice implies problems of residues and resistance; therefore, the demand for a new and safe agent is constant. The present publication investigated the effectiveness of lithium chloride under in vitro conditions on poultry red mites. This chemical currently appears to be one of the most promising alternatives to study amongst potential applicants to treat varroosis, a fatal disease of honey bees. In Experiment I, the previously used experimental doses (5.52 M, 2.76 M, 1.38 M) on Varroa mites confirmed their in vitro activity on the poultry red mite. Three event times (uncontrolled movement, immobilisation and death) were recorded to base the response to treatment for each concentration. In Experiment II, the LD 50 value was calculated, i.e., the value at which 50% of the mites were killed by the treatment. This Experiment showed that the LD50 of lithium chloride = 0.265 M in the poultry red mite. It is to note that the study remained restricted to in vitro confirmation of lithium chloride's effectiveness on the parasite. Thus, further extensive studies are needed to decide whether it has any relevance in practice against D. gallinae, and also to assess potential residue problems that could affect poultry products.
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Affiliation(s)
- Balázs Kolics
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Éva Kolics
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Izabella Solti
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Zsuzsanna Bacsi
- Institute of Agricultural and Food Economics, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - János Taller
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - András Specziár
- Balaton Limnological Research Institute, H-8237 Tihany, Hungary
| | - Kinga Mátyás
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
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Sevin S, Bommuraj V, Chen Y, Afik O, Zarchin S, Barel S, Arslan OC, Erdem B, Tutun H, Shimshoni JA. Lithium salts: assessment of their chronic and acute toxicities to honey bees and their anti-Varroa field efficacy. PEST MANAGEMENT SCIENCE 2022; 78:4507-4516. [PMID: 35808970 DOI: 10.1002/ps.7071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 06/30/2022] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Varroa control is essential for the maintenance of healthy honey bee colonies. Overuse of acaricides has led to the evolution of resistance to those substances. Studies of the short-term acaricidal effects and safety of various lithium (Li) salts recently have been reported. This study examined the long-term in vitro and in vivo bee toxicities, short-term motor toxicity to bees and long-term anti-Varroa field efficacy of several Li salts. RESULTS In an in vitro chronic-toxicity assay, lithium citrate (18.8 mm) was the most toxic of the examined salts, followed by lithium lactate (29.5 mm), and lithium formate (32.5 mm). In terms of acute locomotor toxicity to bees, all of the Li salts were well-tolerated and none of the treatment groups differed from the negative control group. In an in vitro survival study, all of the Li treatments significantly reduced bee life spans by a factor of 1.8-7.2, as compared to the control. In terms of life expectancy, lithium citrate was the most toxic salt, with no significant differences noted between lithium formate and lithium lactate. In the bee-mortality field study, none of the examined treatments differed from the negative control. Amitraz and lithium formate exhibited similar acaricide effects, which were significantly different from those observed for lithium lactate and the negative control. CONCLUSION In light of lithium formate's honey bee safety and efficacy as an acaricide, additional sublethal toxicity studies in brood, drones and queens, as well as tests aimed at the optimization of administration frequency are warranted. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Sedat Sevin
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - Vijayakumar Bommuraj
- Department of Food Quality & Safety, Institute for Postharvest and Food Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
| | - Yaira Chen
- Department of Food Quality & Safety, Institute for Postharvest and Food Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
| | - Ohad Afik
- Agricultural Extension Service, Ministry of Agriculture and rural development, Bet Dagan, Israel
| | - Shlomi Zarchin
- Agricultural Extension Service, Ministry of Agriculture and rural development, Bet Dagan, Israel
| | - Shimon Barel
- Kimron Veterinary Institute, Department of Toxicology, Bet Dagan, Israel
| | - Okan Can Arslan
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | - Babür Erdem
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | - Hidayet Tutun
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Jakob A Shimshoni
- Department of Food Quality & Safety, Institute for Postharvest and Food Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
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Jovanovic NM, Glavinic U, Ristanic M, Vejnovic B, Stevanovic J, Cosic M, Stanimirovic Z. Contact varroacidal efficacy of lithium citrate and its influence on viral loads, immune parameters and oxidative stress of honey bees in a field experiment. Front Physiol 2022; 13:1000944. [PMID: 36171978 PMCID: PMC9510912 DOI: 10.3389/fphys.2022.1000944] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 08/29/2022] [Indexed: 11/13/2022] Open
Abstract
With an almost global distribution, Varroa destuctor is the leading cause of weakening and loss of honey bee colonies. New substances are constantly being tested in order to find those that will exhibit high anti-Varroa efficacy at low doses/concentrations, without unwanted effects on bees. Lithium (Li) salts stood out as candidates based on previous research. The aims of this study were to evaluate Li citrate hydrate (Li-cit) for its contact efficacy against Varroa, but also the effect of Li-cit on honey bees by estimating loads of honey bee viruses, expression levels of immune-related genes and genes for antioxidative enzymes and oxidative stress parameters on two sampling occasions, before the treatment and after the treatment. Our experiment was performed on four groups, each consisting of seven colonies. Two groups were treated with the test compound, one receiving 5 mM and the other 10 mM of Li-cit; the third received oxalic acid treatment (OA group) and served as positive control, and the fourth was negative control (C group), treated with 50% w/v pure sucrose-water syrup. Single trickling treatment was applied in all groups. Both tested concentrations of Li-cit, 5 and 10 mM, expressed high varroacidal efficacy, 96.85% and 96.80%, respectively. Load of Chronic Bee Paralysis Virus significantly decreased (p < 0.01) after the treatment in group treated with 5 mM of Li-cit. In OA group, loads of Acute Bee Paralysis Virus and Deformed Wing Virus significantly (p < 0.05) increased, and in C group, loads of all viruses significantly (p < 0.01 or p < 0.001) increased. Transcript levels of genes for abaecin, apidaecin, defensin and vitellogenin were significantly higher (p < 0.05—p < 0.001), while all oxidative stress parameters were significantly lower (p < 0.05—p < 0.001) after the treatment in both groups treated with Li-cit. All presented results along with easy application indicate benefits of topical Li-cit treatment and complete the mosaic of evidence on the advantages of this salt in the control of Varroa.
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Affiliation(s)
- Nemanja M. Jovanovic
- Department of Parasitology, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Uros Glavinic
- Department of Biology, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Marko Ristanic
- Department of Biology, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Branislav Vejnovic
- Department of Economics and Statistics, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Jevrosima Stevanovic
- Department of Biology, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
- *Correspondence: Jevrosima Stevanovic,
| | - Milivoje Cosic
- Institute of Forestry, Belgrade, Serbia
- Department of Animal Breeding, Faculty of Agriculture, Bijeljina University, Bijeljina, Bosnia and Herzegovina
| | - Zoran Stanimirovic
- Department of Biology, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
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Comparison of Alternative Application Methods for Anti- Varroa Lithium Chloride Treatments. INSECTS 2022; 13:insects13070633. [PMID: 35886809 PMCID: PMC9318583 DOI: 10.3390/insects13070633] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/05/2022] [Accepted: 07/11/2022] [Indexed: 12/10/2022]
Abstract
Varroosis is one of the most dangerous threats to the bee industry but means of its treatment are still unsatisfactory. Lithium-based anti-Varroa treatments may provide an alternative, as this trace element can be a natural component of honey and is well tolerated by adult bees. However, it can be toxic to larvae and its use in beekeeping practice is not yet well understood. The present study aimed to investigate the efficacy of relevant application methods of acaricides used in beekeeping practice in brood-free conditions for lithium. Vaporisation proved to be an inefficient method of lithium treatment and killed only 9.9 ± 3.3% (mean ± SD) of mites in the hive. Lithium-impregnated paper strips showed moderate efficiency by killing 55.1 ± 26.2% of mites. The most effective way of applying lithium was the trickling method; different trickling treatments decreased the abundance of mites on average by 65 to 99.7%, depending on the applied dosage and the number of treatments. Repeated trickling treatments were more effective than single treatments, and they generally provided >90% efficiency. Experiments also proved that adding sugar to the trickling solution does not influence treatment efficiency. Thus, it is suggested that repeated and sugar-free trickling treatments with moderate lithium dosage could be the most rational methodology. Since lithium is not yet legalised in beekeeping practice, comprehensive studies are also needed to uncover the amount of lithium residue in bee products, depending on the treatment parameters.
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Bartlett LJ. Frontiers in effective control of problem parasites in beekeeping. Int J Parasitol Parasites Wildl 2022; 17:263-272. [PMID: 35309040 PMCID: PMC8924282 DOI: 10.1016/j.ijppaw.2022.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 02/27/2022] [Accepted: 03/01/2022] [Indexed: 12/21/2022]
Abstract
Demand for better control of certain parasites in managed western honey bees (Apis mellifera L.) remains apparent amongst beekeepers in both Europe and North America, and is of widespread public, scientific, and agricultural concern. Academically, interest from numerous fields including veterinary sciences has led to many exemplary reviews of the parasites of honey bees and the treatment options available. However, summaries of current research frontiers in treating both novel and long-known parasites of managed honey bees are lacking. This review complements the currently comprehensive body of literature summarizing the effectiveness of parasite control in managed honey bees by outlining where significant gaps in development, implementation, and uptake lie, including integration into IPM frameworks and separation of cultural, biological, and chemical controls. In particular, I distinguish where challenges in identifying appropriate controls exist in the lab compared to where we encounter hurdles in technology transfer due to regulatory, economic, or cultural contexts. I overview how exciting frontiers in honey bee parasite control research are clearly demonstrated by the abundance of recent publications on novel control approaches, but also caution that temperance must be levied on the applied end of the research engine in believing that what can be achieved in a laboratory research environment can be quickly and effectively marketed for deployment in the field.
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Affiliation(s)
- Lewis J Bartlett
- Center for the Ecology of Infectious Disease, University of Georgia, Athens, GA, 30602, USA
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Vilarem C, Piou V, Vogelweith F, Vétillard A. Varroa destructor from the Laboratory to the Field: Control, Biocontrol and IPM Perspectives-A Review. INSECTS 2021; 12:800. [PMID: 34564240 PMCID: PMC8465918 DOI: 10.3390/insects12090800] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/30/2021] [Accepted: 09/02/2021] [Indexed: 12/13/2022]
Abstract
Varroa destructor is a real challenger for beekeepers and scientists: fragile out of the hive, tenacious inside a bee colony. From all the research done on the topic, we have learned that a better understanding of this organism in its relationship with the bee but also for itself is necessary. Its biology relies mostly on semiochemicals for reproduction, nutrition, or orientation. Many treatments have been developed over the years based on hard or soft acaricides or even on biocontrol techniques. To date, no real sustainable solution exists to reduce the pressure of the mite without creating resistances or harming honeybees. Consequently, the development of alternative disruptive tools against the parasitic life cycle remains open. It requires the combination of both laboratory and field results through a holistic approach based on health biomarkers. Here, we advocate for a more integrative vision of V. destructor research, where in vitro and field studies are more systematically compared and compiled. Therefore, after a brief state-of-the-art about the mite's life cycle, we discuss what has been done and what can be done from the laboratory to the field against V. destructor through an integrative approach.
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Affiliation(s)
- Caroline Vilarem
- Laboratoire Evolution et Diversité Biologique, UMR5174, CNRS-Université de Toulouse III-IRD, INU Jean-François Champollion, Université Paul Sabatier, 31077 Toulouse, France; (C.V.); (V.P.)
- M2i Biocontrol–Entreprise SAS, 46140 Parnac, France;
| | - Vincent Piou
- Laboratoire Evolution et Diversité Biologique, UMR5174, CNRS-Université de Toulouse III-IRD, INU Jean-François Champollion, Université Paul Sabatier, 31077 Toulouse, France; (C.V.); (V.P.)
| | | | - Angélique Vétillard
- Laboratoire Evolution et Diversité Biologique, UMR5174, CNRS-Université de Toulouse III-IRD, INU Jean-François Champollion, Université Paul Sabatier, 31077 Toulouse, France; (C.V.); (V.P.)
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Kolics É, Sajtos Z, Mátyás K, Szepesi K, Solti I, Németh G, Taller J, Baranyai E, Specziár A, Kolics B. Changes in Lithium Levels in Bees and Their Products Following Anti- Varroa Treatment. INSECTS 2021; 12:insects12070579. [PMID: 34202123 PMCID: PMC8304643 DOI: 10.3390/insects12070579] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/15/2021] [Accepted: 06/21/2021] [Indexed: 11/16/2022]
Abstract
Simple Summary Varroosis caused by the ectoparasitic mite Varroa destructor has been the biggest threat to managed bee colonies over recent decades. Chemicals available to treat the disease imply problems of resistance, inconsistent efficacy, and residues in bee products. Recently, alongside novel compounds to defeat the pest, lithium chloride has been found to be effective. In this study, we found that lithium treatments leave beeswax residue-free. The possibility of decontamination in adult bees, bee bread, and uncapped honey was revealed. On the other hand, ripe honey was found to be affected by lithium administered via feeding. Case studies are necessary to uncover the level of exposition in harvested honey to estimate its potential risk once it becomes a registered veterinary medicine. Abstract The biggest threat to beekeeping is varroosis caused by the mite Varroa destructor. Chemicals available to treat this fatal disease may present problems of resistance or inconsistent efficacy. Recently, lithium chloride has appeared as a potential alternative. To date, the amount of residue lithium treatments may leave in honeybee products is poorly understood. Honeybees were fed with 25 mM lithiated sugar syrup, which was used in earlier studies. The accumulation and elimination of the lithium were monitored in bees and their products for 22 days. Lithium concentration increased in the entire body of the bees to day 4 post-treatment and then recovered rapidly to the control level. Lithium exposure was found to affect uncapped honey in the short term (<16 days), but ripe (capped) honey measured at the end of the trial remained affected. On the other hand, lithium treatment left beeswax lithium-free. Based on these data, we propose that comprehensive research on harvested honey is needed to decide on the veterinary use of lithium.
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Affiliation(s)
- Éva Kolics
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
- Kolics Apiaries, H-8710 Balatonszentgyörgy, Hungary
| | - Zsófi Sajtos
- Doctoral School of Chemistry, University of Debrecen, H-4032 Debrecen, Hungary;
- Atomic Spectrometry Partner Laboratory, Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary;
| | - Kinga Mátyás
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
| | - Kinga Szepesi
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
| | - Izabella Solti
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
| | - Gyöngyi Németh
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
| | - János Taller
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
| | - Edina Baranyai
- Atomic Spectrometry Partner Laboratory, Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary;
| | - András Specziár
- Balaton Limnological Research Institute, ELKH, H-8237 Tihany, Hungary;
| | - Balázs Kolics
- Festetics Bioinnovation Group, Institute of Genetics and Biotechnology, Georgikon Campus, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary; (É.K.); (K.M.); (K.S.); (I.S.); (G.N.); (J.T.)
- Kolics Apiaries, H-8710 Balatonszentgyörgy, Hungary
- Correspondence: ; Tel.: +36-302629236
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