Evaluation of varied nitrogen dosages on population build up of cotton whitefly (Bemisia tabaci, Gennadius)

Abstract

An experiment was conducted with an objective of studying the effect of varied nitrogen doses on population build up of cotton whitefly adults and its nymphs. The result revealed that, the whitefly adults and nymphs population was maximum on crop treated with excess dose of nitrogen fertilizer (5.89 adults and 8.1 nymphs/leaf). It was concluded from the trial that provision of nutrients to the plants in larger amounts in shorter period, leads to heavy insect population than the nutrient provision at recommended dose.