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Pakistan Journal of Biological Sciences

Year: 2004 | Volume: 7 | Issue: 2 | Page No.: 130-133
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Authors

Mohammed A. Al-Doghairi

Suloiman AL-Rehiayani

Khaled A. Osman

Eltayeb A. Elhag

Keywords

A variety of pesticides is used in alfalfa field to control pests. Biological control agents are also used to control these pests, therefore it is important to understand the effects of such pesticides on these beneficial insects. The present study was carried out to examine the residual effects of Dursban and Fenvalerate as conventional pesticides as well as Bio-Fly and Bio-Neem as biorational pesticides on ladybird beetle, Adonia variegata Goeze using panel exposure technique. Dursban was highly toxic to ladybird beetles at ½, 1 and 2 folds of the recommended dosages, where mortality percentages ranging from 46.7-50, 50 and 55-55.33%, respectively during the period of 1-120 h. Fenvalerate produced moderate toxic effects on the coccinellids, where mortality percentages were 10-47.7, 20-50 and 13.33-50% following the residual exposure of ½, 1 and 2 folds of the recommended dosages. On the other hand, the biorational pesticides Bio-Neem and Bio-Fly showed slight toxicity of a maximum of 10% mortality, produced after 5-day exposure of their recommended and half the recommended dosages. When the dose was doubled the toxicity of Bio-Fly did not increase, however, that of Bio-Neem reached 26.7 after 5 days. It can be concluded that in IPM programs, the application of conventional pesticides must be considered carefully for use, whereas biorational pesticides can be used with natural enemies with minimum effects.
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