Comparative Toxicities and Synergism of Apple Orchard Pesticides to Apis mellifera (L

Discussion in 'Bee News' started by Americasbeekeeper, Sep 12, 2013.

  1. Americasbeekeeper

    Americasbeekeeper New Member

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    Comparative Toxicities and Synergism of Apple Orchard Pesticides to Apis mellifera (L.) and Osmia cornifrons (Radoszkowski)
    The topical toxicities of five commercial grade pesticides commonly sprayed in apple orchards were estimated on adult worker honey bees, Apis mellifera (L.) (Hymenoptera: Apidae) and Japanese orchard bees, Osmia cornifrons (Radoszkowski) (Hymenoptera: Megachilidae). The pesticides were acetamiprid (Assail 30SG), λ-cyhalothrin (Warrior II), dimethoate (Dimethoate 4EC), phosmet (Imidan 70W), and imidacloprid (Provado 1.6F). At least 5 doses of each chemical, diluted in distilled water, were applied to freshly-enclosed adult bees. Mortality was assessed after 48 hr. Dose-mortality regressions were analyzed by probit analysis to test the hypotheses of parallelism and equality by likelihood ratio tests. For A. mellifera, the decreasing order of toxicity at LD[SUB]50[/SUB] was imidacloprid, λ-cyhalothrin, dimethoate, phosmet, and acetamiprid. Estimates of response parameters for each mixture component applied to each species were compared with dose-response data for each mixture in statistical tests of the hypothesis of independent joint action. For each mixture, the interaction of fenbuconazole (a material non-toxic to both species) was significant and positive along the entire line for the pesticide. Our results clearly show that responses of A. mellifera cannot be extrapolated to responses of O.cornifrons, and that synergism of neonicotinoid insecticides and fungicides occurs using formulated product in mixtures as they are commonly applied in apple orchards.
    http://www.plosone.org/article/info:doi/10.1371/journal.pone.0072587
     
  2. camero7

    camero7 Member

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    I've quit pollination because of the above. The fungicides can be deadly when combined with pesticides. I lost all my hives in one orchard when the orchard next door sprayed during bloom in the middle of the morning when bees were flying.