Biosafety of a biopesticide and some pesticides used on cotton crop against green lacewing, Chrysoperla carnea (Stehens) (Neuroptera: Chrysopidae)

Chlorpyrifos, lambda-cyhalothrin, cypermethrin, spinosad and buprofezin were tested against the second instar larvae and adults (except buprofezin) of the green lacewing, Chrysoperla carnea. The results showed that chlorpyrifos was more toxic to second instar larvae than lambda-cyhalothrin, cypermethrin, spinosad and buprofezin with LC50 values of 1.78, 8.81, 26.9, 294.36 and 997.05 ppm respectively. However, lambda-cyhalothrin was highly toxic to the adult of C. carnea compared to the other pesticides. The LC50 of lambda-cyhalothrin was 0.04 ppm. Buprofezin and Spinosad were the least toxic to second instar larvae and adults of C. carnea respectively. According to the percents of mortality, these pesticide toxicity was classified into harmful pesticide (chlorpyrifos), moderately harmful (lambda-cyhalothrin and cypermethrin), slightly harmful pesticide (spinosad) and harmless pesticides (buprofezin). While, with the adults treated, these pesticides classified into two groups such as moderately harmful (lambda-cyhalothrin, chlorpyrifos and cypermethrin) and less harmful (spinosad) pesticides. These results confirmed that the adult of C. carnea was more susceptible to the previous pesticides than second instar larvae. Buprofezin and spinosad are more suitable pesticides for integrated pest management programs and can be used upon the peak of C. carnea population density.