Articles

Preliminary results on the preferences of Callosobruchus maculatus on Apulian germplasm of Cicer arietinum


Abstract


The susceptibility of six genotypes of Cicer arietinum L. (Fabaceae) to Callosobruchus maculatus (Fabr.) (Coleoptera: Bruchidae) was evaluated through comparative laboratory bioassays. The egg-laying amount, pattern of adult emergence, median development time and pre-adult mortality were assessed under free-choice and no-choice bioassays on three local genotypes (Altamura, Grumo Appula White and Grumo Appula Black) and three commercial varieties (Barraco, Sultano and standard of large-scale retail trade as control). Trials were performed on a completely randomized experimental design under artificial conditions with the release of males and females (ratio 1:3), at the most 24-h old. Among the assayed genotypes, the local one provided with a black coat (Grumo Appula Black) was significantly (P<0.05) the least susceptible to the cowpea beetle owing to the least number of laid eggs (2.0±1.8 under free-choice and 2.2±1.3 under no-choice bioassays), the delayed median developmental time (30.3±0.6 and 32.3±0.6, respectively), the lower adult emergence (45.6 and 46.2, respectively) and susceptibility index (7.7±2.04 and 7.8±0.51, respectively).

Keywords

Bruchidae; Fabaceae; local genotypes; free-choice bioassay; no-choice bioassay

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