L. Saravanan and N. Sivaraj*
ICAR-National Bureau of Plant Genetic Resources, Regional Station, Hyderabad 500030
Email: sivarajn@gmail.com
Received-04.09.2022, Revised-14.09.2022, Accepted-29.09.2022
Abstract: Twenty four cowpea genotypes collected from different regions of Andhra Pradesh, Odisha, Tamil Nadu and Telangana States were evaluated for their reaction against pulse beetle, Callosobruchus chinensis. Seed traits viz., seed length, seed width, test seed weight and insect biological parameters viz., number of eggs laid/20 seeds, number of adults emerged/20 seeds, percent adult emergence, mean developmental period, insect growth index and percent seed weight loss were used to assess the spatial distribution and diversity in the reaction of cowpea germplasm against C. chinensis using DIVA-GIS applications. Traits viz., percent adult emergence, growth index and number of eggs/ 20 seeds exhibited high variability as evidenced by high co-efficient of variation (CV) of 27.3%, 26.45% and 23.9% respectively. Moderately low CV values were observed for mean developmental period (0.83%) and number of adults emerged/20 seeds (4.74%). The study revealed that Adilabad district of Telangana and Srikakulam district of Andhra Pradesh were found highly diverse for all the traits including seed traits with high index values (1.433 – 2.000 for majority of the traits). The present findings would enable to identify the sources of resistance in cowpea germplasm geographically and spatially through grid maps.
Keywords: Cowpea, Callosobruchus chinensis, Cowpea resistance, DIVA-GIS, Geographical distribution
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