RESPONSE OF VARIOUS COTTON GENOTYPES AGAINST SUCKING AND BOLLWORM COMPLEXES
Keywords:bollworms, cotton genotypes, screening, sucking pests, yield
In the present study, eighteen cotton genotypes were screened out for their relative resistance against sucking insect pests (jassid, whitefly and thrips) and bollworms (spotted and pink) at the experimental farm of Nuclear Institute of Agriculture (NIA), Tandojam. The experiment was conducted under Randomized Complete Block Design (RCBD) with three replications. The result of overall mean revealed that NIA-HM-323 had comparatively greater resistance to the attack of jassid (0.52/leaf), followed by 0.53 and 0.58 insects per leaf on NIA-H-13 and NIA-81, respectively. Appreciably, low infestation of thrips (2.25/leaf) and whitefly (0.43/leaf) was recorded on NIA-H-13. Moreover, the genotypes NIA-Noori and NIA-Ufaq proved to be the most efficient genotypes rendering the lowest infestation of pink (1.93%) and spotted (2.14%) bollworms with highest recorded yields (2468 and 2295 kg/ha) but moderate in their degree of resistance against sucking pests compared to other tested genotypes. Whereas, higher infestation of insect pests and lowest cotton yield were recorded in genotypes NIA-M-34 and NIA-85. Furthermore, it was observed that jassid showed peak activity in the month of June, while the infestation of thrips and whitefly was highest in July and August, respectively. However, the month of September was found to be the most favorable for bollworms.