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  1. #1
    Join Date
    Jun 2004
    edmonds, WA, USA

    Default Success with neem oil?

    Has anyone had success using neem oil against Varoa? How do you use it? Thanks, Paul.

  2. #2
    Join Date
    Aug 2004
    Lincolnton Ga. USA.

  3. #3
    Join Date
    Sep 2007
    Fayetteville, AR, USA


    Comparative Laboratory Toxicity of Neem Pesticides to Honey Bees (Hymenoptera: Apidae), Their Mite Parasites Varroa jacobsoni (Acari: Varroidae) and Acarapis woodi (Acari: Tarsonemidae), and Brood Pathogens Paenibacillus larvae and Ascophaera apis

    Authors: Melathopoulos A.P.; Winston M.L.; Whittington R.; Smith T.; Lindberg C.; Mukai A.; Moore M.

    Source: Journal of Economic Entomology, Volume 93, Number 2, April 2000 , pp. 199-209(11)

    Publisher: Entomological Society of America


    Laboratory bioassays were conducted to evaluate neem oil and neem extract for the management of key honey bee (Apis mellifera L.) pests. Neem pesticides inhibited the growth of Paenibacillus larvae (Ash, Priest & Collins) in vitro but had no effect on the growth of Ascophaera apis (Olive & Spiltoir). Azadirachtin-rich extract (neem-aza) was 10 times more potent than crude neem oil (neem oil) against P. larvae suggesting that azadirachtin is a main antibiotic component in neem. Neem-aza, however, was ineffective at controlling the honey bee mite parasites Varroa jacobsoni (Ouduemans) and Acarapis woodi (Rennie). Honey bees also were deterred from feeding on sucrose syrup containing >0.01 mg/ml of neem-aza. However, neem oil applied topically to infested bees in the laboratory proved highly effective against both mite species. Approximately 5090% V. jacobsoni mortality was observed 48 h after treatment with associated bee mortality lower than 10%. Although topically applied neem oil did not result in direct A. woodi mortality, it offered significant protection of bees from infestation by A. woodi. Other vegetable and petroleum-based oils also offered selective control of honey bee mites, suggesting neem oil has both a physical and a toxicological mode of action. Although oils are not as selective as the V. jacobsoni acaricide -fluvalinate, they nonetheless hold promise for the simultaneous management of several honey bee pests.


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