Screening of greengram genotypes against pulse beetle based on biological parameters (C. chinensis)

The performance of thirty three greengram accessions against C. chinensis infestation was assessed based on the physical and biological parameters of the pulse beetle. The studies revealed reduction in test weight in all the accessions due to insect infestation and it ranged from 1.43 g (KVSA1787) to 5.03 g (KVSA-1790) and the accessions viz., NSKMS111, KSAS-06/140, LGG-460, KVSA-1790, KVSA-1741 and KARS-39 with minimum reduction in test weight were non preferred by the insect. The seed coat thickness exhibited non significant differences among the green gram accessions, indicating that the seed coat thickness had no relationship with resistance/tolerance to pulse beetle. Significant variation was observed among the accessions with respect to pest development and seed damage. The accessions KSAS-06/140, KSAS-1790, NSKMS-111and LGG460 with zero index of susceptibility were found to be significantly superior and resistant for insect infestation over the other accessions. Further, minimum weight loss was also noticed in the accessions NSKMS-111, KSAS-06/140, LGG-460, KARS-39, KVSA-1741 and KVSA-1790.