PBO suppressible resistance in cotton aphid, Aphis gossypii Glover to selected insecticides in Andhra Pradesh.

摘要

The aphid populations of Warangal, Andhra Pradesh, India, were bioassayed against piperonyl butoxide (PBO) combined with endosulfan, monocrotophos, dimethoate, phosphamidon, carbaryl and cypermethrin at 1:5 and 1:10 ratios. The synergistic factors at LC50 due to mixing of endosulfan with PBO were 2.54 for 1:5 ratio and 3.50 for 1:10 ratio. The degree of synergism slightly increased with an increase in the synergistic ratio from 1:5 to 1:10 ratio at LC50. PBO synergized monocrotophos by 3.33-fold for 1:5 ratio and 4.12-fold for 1:10 ratio at LC50. The synergistic factors due to mixing of dimethoate with PBO were 1.92 for 1:5 ratio and 2.40 for 1:10 ratio at LC50. Phosphamidon was synergized by PBO up to 2.15-fold for 1:5 ratio and 4.94-fold for 1:10 ratio at LC50. The synergistic factors due to mixing of PBO with carbaryl were 1.28 and 1.88 for 1:5 and 1:10 ratio, respectively, at LC50. Cypermethrin in combination with PBO showed synergistic factors of 4.44 for 1:5 ratio and 6.67 for 1:10 ratio at LC50.