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The Sublethal Effects of Certain Pesticides on the Reproductive Performance of
the Land Snail Theba Pisana
- Hussein, A. A.(1), Y. Abo Bakr(2), F. A. Kassem(3), H. I. El-Deeb(2) and E. A. M. Abdallah(3)
- (1)Central Agriculture Pesticide Laboratory, ARC.
- (2)Department of Agricultural Animal Pests, Plant Protection Research Institute, ARC.
- (3)Pesticide Chemistry Dept. Faculty of Agriculture, Alexandria University.
- The Third International Conference onIPM Role in Integrated Crop management and Impacts on Environment and Agricultural Products. 26-29 November 2005, Giza, Egypt.
Abstract
The present study aimed to investigate the sublethal effects of different pesticides on the reproductive performance of the land snail Theba pisana using wheat bran laboratory formulated toxic bait. Changes in reproductive parameters included fecundity, fertility, number of clutches, depth of clutches, egg weight, as well as the number of eggs per clutch (clutch size) were recorded for T. pisana treated with methomyl, chlorpyrifos or metaldehyde against control. Fecundity and fertility were increased with methomyl and chlorpyrifos treatments, while the same parameters were reduced by metaldehyde treatment. Also, number of clutches was increased by methomyl and chlorpyrifos, but decreased by metaldehyde treatment. Depth of clutches was decreased by all tested pesticides. Egg weight was reduced by methomyl treatment only, while chlorpyrifos and metaldehyde did not exhibit any effect on egg weight. All pesticides reduced the number of eggs per clutch (clutch size).
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