Biology of Seed Beetle, Bruchus affinis Frolich (Coleoptera: Chrysomelidae) on Various Field Pea Genotypes under Temperate Conditions of Kashmir

Abstract

Pulses, containing 20–25% protein, are crucial for dietary security, with India contributing about 25% of global pulse production. Field pea (Pisum sativum L.), known as “matar” in India, and an important cool-season pulse valued for its high protein, starch, fibre, minerals, and vitamins, contributes about 3% of the total pulse area and nearly 5% of pulse production in the country. A laboratory study was conducted during 2023-2024 at the Division of Entomology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, to investigate the biology of the seed beetle Bruchus affinis on 26 field pea genotypes under ambient conditions. Significant variation was observed among genotypes for all biological parameters. Genotype IPFD-10-12 generally prolonged insect development, showing the longest mating duration, pre-oviposition, oviposition, incubation, larval and pupal periods, and the longest total developmental time, along with the lowest fecundity, egg hatchability, adult emergence, and adult longevity. In contrast, Pant-21-55 supported faster development, with shorter biological durations, higher fecundity, egg hatchability, adult emergence, and longer adult longevity. These results indicate marked genotype-dependent effects on the biology of B. affinis, suggesting the potential use of less susceptible genotypes in integrated pest management strategies for field pea.