Evaluation of certain plant extracts for the control of parasitic bee mites, Varroa jacobsoni | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 9, Issue 3, December 2009, Pages 77-88 PDF (514.54 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2009.459629 | ||
| Author | ||
| Ahmed A. Zaitoon | ||
| Dept. of Economic. Entomology, Faculty of Agriculture, El-Shatby, Alexandria University. | ||
| Abstract | ||
| Toxicity of aqueous, methanolic and acetonic extracts of three plants, Rhazya stricta (Decaisne) Azadirachta indica (A. Juss) and Heliotropium bacciferum (Forsk) to parasitic bee mite, Varroa jacobsoni (Oudmans) was evaluated in the field and laboratory conditions. All extracts of the plants demonstrated remarkable toxicity to Varroa mite with varying degree. The greatest effect being due to acetone extracts followed by aqueous extract. Of the three plants, the acetonic extract from R. stricta has shown more toxic effect than others with LC50 of 123.4 ppm after 48 hours compared to 169.3 and 150.8 ppm for A. indica and H. bacciferum, respectively. Mortality percentage was 100% for acetonic extract of R. stricta after 48 hours of treatment with LC50 of 500 ppm, while it was 90 and 93% for A. indica and H. bacciferum, respectively. Acetonic extract of R. stricta reduced infestation to 0.59% under field conditions with 500 ppm after 12 days of treatment. These findings suggested that, the application of acetonic extracts of the used plants, specially extract of R. stricta may have a promising practical application against Varroa mites. | ||
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