EFFICIENCY AND BEHAVIOR OF CERTAIN PESTICIDES ON KEY PESTS INFESTING VEGETABLE CROPS UNDER DIFFERENT CLIMATIC CONDITIONS

Abstract

The object of the present study is to investigate the effect of certain weather conditions on the impact of three insecticides used for the control of the cotton whitefly, Bemisia tabaci (Gennadius) nymphs on five cucumber cultivarsfor two summer and autumn seasons in 2015 and 2016 under unheated multi span plastic house and under open field conditions.. The aims of the plastic house experiment and open field experiment were to investigate the impact of certain climatic conditions (Temperature (Co), Relative humidity (%) on different insecticides efficiencies used for whitefly control compared to untreated check (without any insecticide application) as well as the effect of climatic conditions on the peak of white fly during the studding season. The obtained results indicated that thiamethoxam insecticide recorded significantly the lowest nymph count on cucumber plants, followed by dinotefuran, However Bernastar was the highest significantly insecticide counts all over the spray tested times.