Resistance monitoring for conventional and new chemistry insecticides on Bemisia tabaci genetic group Asia-I in major vegetable crops from India

Whitefly (Bemisia tabaci Gennadius) is a devastating pest of vegetables, cotton, and many other agricultural and horticultural crops worldwide. Since control of B. tabaci on vegetable crops solely depends on the use of chemical insecticides in India; monitoring the insecticide resistance of B. tabaci populations would be very much essential for achieving successful control and for managing the resistance development. Hence, the aim of the present study was to examine the resistance in different field strains of B. tabaci to traditional organophosphates and new chemical insecticides in India. The resistance ratios were recorded in the range of 30.67–131.48 fold for acephate, 29.17–83.67 fold for triazophos, 0.38–2.51 fold for indoxacarb, 4.55–34.52 fold for dinotefuran, 6.26–27.56 fold for tolfenpyrad, 7.87–31.89 fold for spiromesifen, 1.61–30.08 fold for pyriproxyfen, and 3.09–45.92 fold for flonicamid in comparison to that of the susceptible strain in the laboratory. Resistance levels of B. tabaci populations against the tested insecticides were significantly variable among localities. The present data will be helpful for the selection of proper insecticides on vegetable crops in the field for successful management of B. tabaci in near future.