Assessing the Resistance of Selected Vigna Genotypes to Bruchid Infestation under Storage Conditions

Abstract

The present study was conducted at Plant Protection Laboratory, World Vegetable Center, ICRISAT campus, Hyderabad in the year 2024, aimed to assess the resistance level of selected Vigna genotypes against Callosobruchus species using a no-choice bioassay. Four genotypes (NM94, V2709, AVMU1601, and AVMU1605) were evaluated for resistance against major bruchid species, including Callosobruchus analis (F.), C. chinensis (L.), and C. maculatus (F.), under artificial infestation conditions. Significant differences were observed among the genotypes for parameters such as percent adult emergence, seed damage, and seed weight loss. The highest seed damage (96.66%) was recorded in NM94 and the highest seed weight loss (35.12%) in V2709 when infested with C. analis, while NM94 exhibited the highest adult emergence (69.34%) under C. chinensis infestation. Results indicated that genotypes (V2709, AVMU1601 and AVMU1605) resistant to C. chinensis and C. maculatus were susceptible to C. analis, with none of the genotypes showing full resistance to this species. These findings underscore the need for further investigation into the molecular and biochemical mechanisms underlying resistance, which could inform strategies for effective storage pest management.