Toxicity of certain plant extracts to the parasitic bee mite Varroa jacobsoni in colonies of Apis mellifera | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 9, Issue 3, December 2009, Pages 27-38 PDF (487.57 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2009.459624 | ||
| Authors | ||
| Ahmed A. Zaitoon* ; Mohamed A. S. AL-Eryam | ||
| Dept. of Economic Entomology, Faculty of Agriculture, EL-Shatby, Alexandria University. | ||
| Abstract | ||
| Aqueous extracts of three plants were evaluated in laboratory and field trials as safe and natural botanical products against the parasitic bee mite, Varroa jacobsoni (Oudemans), in colonies of the honeybee, Apis mellifera L. The tested plants were Rhazyia stricta Decaisne, Azadirachta indica A. Juss and Heliotropium bacciferum (Forsk.). The results indicated that all the tested extracts were toxic to Varroa mites. The most potent product was R. stricta extract followed by H. bacciferum and A. indica. Extract had significantly lower with LC50 of 132.6 ppm than both of A. indica and H. bacciferum extracts (181.7 and 177.7 ppm, respectively). R. stricta caused 96.64 % mortality to mites while it was 90 and 93 % for A. indica and H. bacciferum, respectively. Field evaluation showed that the percentages of infestation with mites reduced to 0.63, 2.68 and 1.22 % after 12 days of application (600 ppm) with R. stricta, A. indica and H. bacciferum, respectively. The results suggested that the tested aqueous extracts, particularly R. stricta are promising safe products for control of V. jacobsoni. | ||
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