Prevalence of Natural Enemies on different Cotton Varieties from Sindh

Abstract

The field survey on population dynamics of natural enemies on different varieties of cotton were conducted during the year 2010 from June to September. The experiment was laid out in RCBD with four replications and four varieties of cotton i-e CIM-506, CIM-473, CRIS-134 and SHAHBAZ were studied for observing the incidence of seven predators i.e. pirate bug, big eyed bug, green lacewing, stethorus, spider, wasp and ant. The overall mean populations of predators were reported significantly highest on CRIS-134 followed by CIM-506. However, no significant difference was recorded on SHAHBAZ and CIM-473 respectively. Correlation of predator’s population with temperature was positive and with rainfall was negative. Analysis of variance showed the significant differences in the population of predators on all the varieties tested during present study.