A comparison of two methods of applying oxalic acid for control of varroa

Bahreini, R.

doi:10.1080/00218839.2003.11101098

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Similarly, Coffey and Breen ( 2016 ) reported 81.5% mite control efficacy when using the trickling method to apply oxalic acid in hives. However, several researchers have pointed out the need for more than one treatment in colonies that have brood (Mutinelli et al 1997 ; Bahreini 2003 ; Giovenazzo and Dubreuil 2011 ). In fact, Emsen et al ( 2007 ) treated colonies containing brood with oxalic acid using the trickling method during early fall and in the same location where this study was conducted, and they found an average rate of varroa mite control below 40%.…”

Section: Discussionmentioning

confidence: 99%

Continuous release of oregano oil effectively and safely controls Varroa destructor infestations in honey bee colonies in a northern climate

et al. 2017

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The ectoparasitic mite Varroa destructor is responsible for the death of millions of honey bee (Apis mellifera) colonies worldwide. Testing potential miticide compounds with different delivery methods that effectively control V. destructor and have low toxicity for honey bees is crucial to manage this parasite in hives. We determined the varroacide efficacy of three natural compounds delivered to hives with three application methods over a 4-week period. Oxalic acid in a sucrose solution was applied impregnated in cardboard (T1). A mixture of oregano and clove oils in an ethanol-gelatin solution was applied impregnated in absorbent pads (T2). Oregano oil alone was delivered using electric vaporizers (T3) to test the hypothesis that continuous release of miticides increases the varroacidal efficacy of essential oils. The varroa mite control rates for treatments T1–T3 were 76.5 ± 7.11, 57.8 ± 12.79 and 97.4 ± 0.68%, respectively, and there were no differences for bee mortality between control and treatments 1 and 3. Additionally, most mites were killed in the first 2 weeks in T3 colonies compared to the last 2 weeks in colonies of the other treatments. These results demonstrate the importance of continuously releasing natural miticides to achieve safe and high rates of mite control in hives. They also show that oregano oil may be an effective miticide against V. destructor infestations in colonies.

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Section: Discussionmentioning

confidence: 99%

Continuous release of oregano oil effectively and safely controls Varroa destructor infestations in honey bee colonies in a northern climate

et al. 2017

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“…In response, beekeepers are showing a growing interest in treatments that work on physical intolerance rather than enzyme degradation, as is the case with synthetic acaricides, to which resistance develops. Therefore, natural chemicals such as organic acids, essential oils, and their derivatives are increasingly used [30,31]. However, several studies suggest that the use of organic acids against Varroa may be harmful to bees.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Efficacy of 30 Different Essential Oils against Varroa destructor and Honey Bee Workers (Apis mellifera)

Hýbl

Bohatá

Rádsetoulalová

et al. 2021

Insects

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Essential oils and their components are generally known for their acaricidal effects and are used as an alternative to control the population of the Varroa destructor instead of synthetic acaricides. However, for many essential oils, the exact acaricidal effect against Varroa mites, as well as the effect against honey bees, is not known. In this study, 30 different essential oils were screened by using a glass-vial residual bioassay. Essential oils showing varroacidal efficacy > 70% were tested by the complete exposure assay. A total of five bees and five mites were placed in the Petri dishes in five replications for each concentration of essential oil. Mite and bee mortality rates were assessed after 4, 24, 48, and 72 h. The LC50 values and selectivity ratio (SR) were calculated. For essential oils with the best selectivity ratio, their main components were detected and quantified by GC-MS/MS. The results suggest that the most suitable oils are peppermint and manuka (SR > 9), followed by oregano, litsea (SR > 5), carrot, and cinnamon (SR > 4). Additionally, these oils showed a trend of the increased value of selective ratio over time. All these oils seem to be better than thymol (SR < 3.2), which is commonly used in beekeeping practice. However, the possible use of these essential oils has yet to be verified in beekeeping practice.

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“…Some experiments have shown that a single spray with OA in aqueous or sucrose solution is considerably more effective than trickling (Brødsgaard et al, 1999;Bahreini, 2003), indicating that greater wetting of bees increases the effectiveness of the oxalic acid in mite control. Our submersion tests also showed the importance of thorough wetting for good mite control.…”

Section: Spraying Experimentsmentioning

confidence: 99%

The effect of different concentrations of oxalic acid in aqueous and sucrose solution onVarroamites and honey bees

2010

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A comparison of two methods of applying oxalic acid for control of varroa

Cited by 6 publications

References 4 publications

Continuous release of oregano oil effectively and safely controls Varroa destructor infestations in honey bee colonies in a northern climate

Continuous release of oregano oil effectively and safely controls Varroa destructor infestations in honey bee colonies in a northern climate

Evaluating the Efficacy of 30 Different Essential Oils against Varroa destructor and Honey Bee Workers (Apis mellifera)

The effect of different concentrations of oxalic acid in aqueous and sucrose solution onVarroamites and honey bees

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