Reproductive characteristics of the predator Podisus nigrispinus fed with an insect resistant soybean variety

The objective of this research was to evaluate the effect of the insect resistant soybean genotype IAC 17 on reproductive characteristics of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) females compared to the soybean insect susceptible genotype UFV 16. Treatments were: T1) females of P. nigrispinus fed on plants of the UFV 16 and Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) caterpillars reared on leaves of this variety; T2) females of P. nigrispinus fed on plants of the IAC 17 and A. gemmatalis caterpillars reared on leaves of this variety. Longevity of females, pre-oviposition, oviposition and pos-oviposition periods, number of eggs and egg masses/female, egg weight, interval between egg mass laying, number of eggs/egg mass, percentage of nymphs, number of nymphs/female and total number of prey killed/female of P. nigrispinus were evaluated. Most of the characteristics evaluated showed similar results between treatments, but the oviposition period was longer for females reared on the resistant genotype than on the susceptible one and the percentage of total females that laid eggs was lower on the IAC 17. Also, the resistant genotype caused higher mortality of P. nigrispinus females at the beginning of its adult stage and egg production by females of this predator was better spread along its adult stage with this resistant genotype. On the other hand, results suggest no effect of the resistant genotype on the offspring of this predator. O objetivo desta pesquisa foi avaliar o efeito do genótipo IAC 17, resistente a insetos, nas características reprodutivas de fêmeas de Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae), utilizando o genótipo susceptível UFV 16 como controle. Os tratamentos foram: T1) fêmeas de P. nigrispinus alimentadas com plantas de UFV 16 e lagartas de Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae), criadas em folhas desta cultivar; T2) fêmeas de P. nigrispinus alimentadas com plantas de IAC 17, e lagartas de A. gemmatalis, criadas em folhas desta cultivar. Avaliou-se a longevidade das fêmeas, períodos de pré-oviposição, oviposição e pós-oviposição, número de ovos e de posturas/fêmea, peso dos ovos, intervalo entre posturas, número de ovos/postura, porcentagem de ovos eclodidos, número de ninfas/fêmea e número total de presas mortas/fêmea de P. nigrispinus. A maioria das características avaliadas mostrou resultados semelhantes entre tratamentos, exceto o período de oviposição, que foi mais longo para f