Abstract
Mealybug, Phenacoccus solenopsis Tinsley is a devastating pest of cotton and many other crops and ornamental plants. P. solertopsis has ability to develop resistance to most chemical classes of insecticides. The aim of present study was to monitor the resistance to new chemical insecticides in different field populations of P. solenopsis. Six populations of P. solenopsis, collected from Multan, Khanewal, Muzaffar Garh, Mailsi, Bahawalpur, and Sahiwal, were tested for resistance to selected new chemical insecticides by the leaf dip method. The resistance ratios were in the range of 4.0-30.9-fold for nitenpyram, 12.6-105.0-fold for acetamiprid, 3.4-79.0-fold for emamectin benzoate, 0.4-2.3 fold for indoxacarb, 12.1-28.9 for pyriproxyfen, 13.0-37.4 for cyromazine, 7.2-35.0 for methoxyfenozide, and 5.5-17.0-fold for lufenuron compared to the laboratory susceptible strain. Regular insecticide resistance monitoring and integrated management plans including the judicious use of insecticides with correct application rates and methods and rotation of insecticides with different modes of action are required to delay insecticide resistance development in P. solenopsis. (C) 2015 Elsevier Ltd. All rights reserved.