author(s)
G Kavitha, MS Mahalakshmi, K Bayyapu Reddy, Y Pushpa Reni and K Radhika

abstract
A total of 12 greengram genotypes were screened for resistance to pulse bruchid, Callosobruchus chinensis, under no-choice artificial infestation conditions. There were significant differences among the genotypes in number of eggs laid, adult emergence, seed weight loss, development period and the growth index of C. chinensis on greengram. The number of eggs laid, adult emergence by pulse bruchid and seed weight loss after artificial infestation was initially low but gradually increased with the increase in storage period. The pooled mean data over 8 months showed that PM-5 was found comparatively resistant to the pulse bruchid as the number of eggs laid (14.00 / 100 seed), adult emergence (17.44%) and weight loss (0.98%) were significantly less when compared to the other genotypes. WGG-42 recorded a significantly higher number of eggs (73.17 / 100 seed), adult emergence (63.20%) and weight loss (29.21%). The development period of pulse beetle on PM-5 (33.83 days) was also longer compared to WGG-42 (25.81 days) indicating the presence of some antibiotic constituents. Of the 12 genotypes screened, five genotypes were categorized based on growth index as resistant, one as moderately susceptible and the remaining six as highly susceptible to C. chinensis.