Resistant insecticides of cotton mealybug, Phenacoccus solenopsis (Tinsley) under laboratory conditions

Abstract

The cotton mealybug, Phenacoccus solenopsis (Tinsley) is well known as most vulnerable sucking insect pest of cotton crop which was found on different alternate host plants of different genera. Therefore, the synthetic and bio-synthetic pesticides namely; Lambda cyhalothrin, Imidacloprid, Profenofos, Cypermethrin and Neem oil (repellent) were applied to check their effect which was replicated five interval times. Thus, data were taken at uniform pre-treatments (100) counted mealybugs and the post-treatments on 1st, 2nd and 3rd day after application of insecticides at Entomology laboratory, department of Zoology, SALU - Khairpur during, 2015 under maintained room temperature 25±2 oC and air conditions 20±2 oC. The data were formulated under LDP line (Schneider-Orelli) formula. The insecticide Profenofos gave 42% mortality on 1st day after application smoothly less effected on 2nd and 3rd day. The neem oil provided the good results up to 20% reduction on 1st day after application. Whereas, the Cypermethrin and Imidacloprid were also found to be less effective up to 5-10% mortality and lambda cyhalothrin was failed to produce any significant result. The analysis of variance showed the significant difference among all pesticides (P