Prevalence of the major pests in transgenic and non-transgenic cotton genotype in response to climatic factors and their impact on yield

摘要

The incidence of insect pests in cotton crop, such as Bemisia tabaci, Amrasca devastans and Pectinophora gossy-piella (PBW) is dependent on climatic factors, such as maximum and minimum temperature, relative humidity and rainfall. Besides, cotton leafcurl disease (CLCuD) is also a major yield-limiting factor in the cotton crop. The results indicated that non-transgenic genotypes were heavily infested by whitefly, whereas jassid infested all genotypes with little difference. The population of whitefly and jassid acquired peak level in the month of July and August on all the genotypes. The correlation studies indicated the negative correlation of jassid, pink bollworm and CLCuD on yield component, whereas whitefly infestation was found positively correlated with CLCuD. Moreover, multivariate regression analysis (MRA) indicated the maximum and minimum temperature impacted the infestation of whitefly and jassid more than other factors, whereas maximum temperature greatly impacted the infestation of PBW in transgenic genotypes.