Abstract

                                Studies were conducted at the Tamil Nadu Agricultural University, Coimbatore on the response of the wolf spider Lycosa pseudoannulata Boes et Str. to different insecticides on varieties exhibiting varied levels of resistance to the brown planthopper (BPH), Nilaparvata lugens (Stal.) and the green leafhopper (GLH) Nephotettix virescens. (Dist.) Combination of varietal resistance and predator was found to play an important part in the suppression of both the pests. The mortality of BPH ranged from 96 to 97.67 per cent respectively on the resistant IR 62 and the moderately resistant IR 64 when treated with ethofenprox in the presence of the wolf spider. Ethofenprox applied either on the susceptible or resistant variety was very effective in suppressing BPH. Combination of varietal resistance and the wolf spider revealed that even maximum control could be evinced with a moderately resistant variety.

Key words : Lycosa pseudoannulata, Nilaparvata lugens, Nephotettix virescens, Insecticides, Varietal Resistance, Integration