Influencia de genotipos de algodoeiro sobre Alabama argillacea (Hubner, 1818) (Lep. Noctuidae) e seu predador Podisus nigrispinus (Dallas, 1851) (Hem.: Pentatomidae)

Abstract

The influence of cotton genotypes (Gossypium hirsutum L.) to Alabama argillacea (Rübner, 1818) and its predator Podisus nigrispinus (DaLlas, 1851) was evaluated. It was observed some biological aspects ofA. argillacea fed on eleven cotton genotypes leaves and it was also studied the biology of predator fed on Aargillacea reared on leaves of the genotypes CNPA Precoce 1, CNPA 9211-41, CNPA 9211-31 and GL2 GL3. Free choice and no choice tests were accomplished in greenhouse to evaluate the ovipositional response of A. argillacea and P. nigrispinus to four cotton genotypes at 60 days ofage. In greenhouse, it was also studied the influence ofthese genotypes on the daily consumption of A. argillacea larvae by P. nigrispinus females. During the development of A. argillacea larvae it was verified that CNPA Precoce 1, CNPA Precoce 2 e CNPA 9211-18 genotypes showed feeding nonpreference and/or antibiosis, while genotypes GL2 GL3 and CNPA 9211-29 were considered susceptible to that pest. Adult females ofA. argillacea, originated from larvae fed on CNPA Precoce 1, showed the shortest oviposition period and the lowest number ofeggs. The survival rate during the nymphal phase ofP. nigrispinus ranged from 85.00 to 100.00% when fed on A argillacea larvae reared on cotton genotypes leaves. The minimum number ofeggs laid by P. nigrispinus was 296.33 and the maximum 611.67 eggs, when fed on A. argillacea larvae reared on GL2 GL3 and CNPA Precoce 1 genotypes, respectively. During the nymphal phase of P. nigrispinus the highest average consumption ofA. argillacea larvae was observed when nymphs were fed on A. argillacea larvae reared on CNPA 9211-41 and CNPA 9211-31 genotypes. The oviposition ofA. argillacea and P. nigrispinus was not influenced by the genotypes studied, which also not affected the A. argillacea larvae predation by this predator.