Resistance of wild and near isogenic bean lines with arcelin variants to Zabrotes subfasciatus (Boheman): I - Winter crop

Abstract

The objective of this study was to determine the resistance of winter crops of bean (Phaseolus vulgaris) lines with arcelin variants to Zabrotes subfasciatus (Boheman) (Coleoptera: Bruchidae). Two trials, a no-choice test and a free-choice test, were set up under laboratory conditions using genotypes Arc. 1, Arc. 2, Arc. 3 and Arc. 4 (near isogenic lines containing arcelin 1, 2, 3 and 4, respectively), genotypes Arc. 1S, Arc. 3S and Arc. 5S (wild lines containing arcelin 1, 3 and 5, respectively), and genotypes IAPAR MD-808 and Porrillo 70. Plots with 10 g of each line and a proportion of 7 adult pairs/plot were used. Attractiveness, oviposition, emergence and adult weight, mortality, developmental period, and seed weight loss were determined. Nonpreference (attraction and oviposition) was observed only for the wild genotypes Arc. 3S and Arc. 5S. The wild genotypes Arc. 5S and Arc. 1S and the near isogenic lines Arc. 1 and Arc. 2 presented high resistance of the antibiosis type to Z. subfasciatus. Arc. 4 and Arc. 3 presented moderate resistance, probably due to feeding nonpreference.