Toxicity of imidacloprid and diafenthiuron to Chrysoperla carnea (Stephens) (Neuroptera: chrysopidae) in the laboratory conditions
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Tamil Nadu Agricultural University, Lawley Road, Coimbatore – 641 003, India
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Gnanadhas Preetha
Tamil Nadu Agricultural University, Lawley Road, Coimbatore – 641 003, India
Journal of Plant Protection Research 2009;49(3):290-296
Insecticides are unavoidable in pest management programs especially when the pest crosses Econimic Threshold Level (ETL). Nevertheless, often the plant protection products kill the natural enemy population making the pest to resurge and thus demanding more sprays. Therefore, insecticides used in IPM programs should be selective enough to spare the beneficials. Laboratory studies were conducted to find out the toxicity of imidacloprid and diafenthiuron to the eggs, larvae and adults of Chrysoperlacarnea. Imidacloprid at the recommended dose of 0.28 ml/l caused 15.38% egg mortality, 26.67 and 33.33% larval mortality by ingestion and contact, respectively and 50.00% adult mortality. The egg mortality was about 15.38% and larval mortality of 23.33% and adult mortality of 26.67% was caused by diafenthiuron. Based on the classification given by IOBC/WPRS working group on Pesticides and non-target invertebrates, both the insecticides were classified as harmless to C. carnea, since the recommended dose caused less than 50% mortality in the laboratory conditions.
The authors have declared that no conflict of interests exist.
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