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Journal of Entomology

Year: 2011 | Volume: 8 | Issue: 5 | Page No.: 429-439
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Authors

Wafaa A. AL-Kherb

Keywords

Research Article

Field Efficacy of Some Neonicotinoid Insecticides on Whitefly Bemicia tabaci (Homoptera: Aleyrodidae) and its Natural Enemies in Cucumber and Tomato Plants in Al-qassim Region, KSA

Wafaa A. AL-Kherb
The effect of three successive treatments with the recommended concentrations of the neonicotinoid insecticides, acetamiprid, imidacloprid and thiamethoxam on immature stages and adults of the whitefly, Bemicia tabaci (Gennadius) was investigated. Insecticide applications were conducted against whitefly infesting summer and autumn plantations of cucumber Cucumis sativus L. and tomato Lycopersicum esculentum Mille. under field conditions in Onyyzah governorate, Qassim region, Saudi Arabia. Dead and living insect individuals were counted 3, 7 and 14 days after each treatment. Tested insecticides significantly suppressed the population of immature stages and adults of whitefly B. tabaci living on plant leaves. Thiamethoxam showed the highest rates of efficiency against whitefly. It caused reduction in whitefly adult and immature stage populations attacking early summer cucumber by 87.5 and 82.4% after three sprays, respectively. In autumn plantations, acetamiprid, imidacloprid and thiamethoxam caused total reduction percentages in adults of B. tabaci of 67.3, 71.9 and 84.7%, respectively. The immature stages of the tested pest infesting autumn cucumber plants was reduced by 60.1, 72.8 and 82.1%, respectively. The tested insecticides variably affected the non target predatory insects where thiamethoxam was the most toxic compound and followed by imidacloprid and acetamiprid. Their harmful effect can be ranked from harmless to slightly harmful to predatory insects. Their side effect was significantly higher on Orius sp. and declined the populations of Paederus alfierii Koch, Coccinella undicempunctata (Reiche) and Chrysoperla carnea (Steph.).Therefore, the tested neonicotinoids could be considered promising candidates in controlling whitefly with a lower value of harmful effect on beneficial insect species.
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