Susceptibility response of varieties and local lupine Lupinus albus L. population to Bruchus rufimanus Boheman, 1833 (Coleoptera: Chrysomeloidae)

Abstract

This study aimed to evaluate the susceptibility response of varieties and local populations of lupine Lupinus albus to broadbean seed beetle Bruchus rufimanus in multi-environment field tests. Seed damage rate and susceptibility index were assessed in each environment and subjected to a heritability-adjusted genotype and genotype x environment biplot analysis. It was found that the susceptibility index of damaged seeds was positively correlated to precipitation amount and humidity, and inversely to minimal and maximal temperature values. The seed damage rate was positively correlated to temperatures but negatively to rain and humidity. The local Polish population WAT and cultivars Pink Mutant, Solnechnii, and Bezimenii 1 had the lowest seed damage rate and stable position across environments. Meanwhile, these cultivars showed a low susceptibility index and low variability. The discrepancy between the early phenological development of Pink Mutant, Solnechnii, and Bezimenii 1 and the life cycle of B. rufimanus was one of the reasons for the species’ tolerance to B. rufimanus Correlations between damaged seed and susceptibility index as well as the mass of 1000 seeds and sensitivity index were strongly positive and negative, respectively. WAT, Pink Mutant, Solnechnii, and Bezimenii 1 had a clear advantage by defending itself from B. rufimanus attack, which makes them particularly interesting for breeding purposes.