RESUMO O objetivo do trabalho foi irradiar pupas de Spodoptera frugiperda para induzir a esterilidade nos adultos emergidos. Pupas com cinco dias de idade foram irradiadas com doses crescentes de radiação gama de 0 (test.), 50, 100, 125, 150, 175 e 200 Gy, sob uma taxa de dose de 2.15 kGy/hora. Os adultos emergidos foram cruzados com adultos normais (Mi x Fn)(Fi x Mn) num total de cinco casais por tratamento. O experimento foi conduzido em camara climatica com temperatura de 25±2°C e umidade relativa de 70±5%, fotoperiodo de 14:10. Pelos resultados obtidos concluiu-se que a dose de 200 Gy aplicada nas pupas foi suficiente para induzir a esterilização nos adultos emergidos. test., test test. , (test.) 50 100 125 150 17 20 215 2 15 2.1 kGyhora kGy hora kGy/hora Mi FnFi Fn Fi Mn tratamento 252C C 25 705 70 5 70±5% 1410. 1410 14 10. 10 14:10 concluiuse concluiu se (test. 12 1 21 2. 7 70±5 141 14:1 (test 70± 14:

ABSTRACT The objective of the research was irradiated pupae of Spodoptera frugiperda to induzed sterilizing on the adults emerged. Pupae with five days-old age were irradiated with increased doses of gamma radiation 0(control), 50, 100, 125, 150, 175 and 200 Gy, at dose rate of 2.15 kGy/hour. Irradiated adults were crossed with normal adults (Mi x Fn)(Fi x Mn) in the total of five pair for treatment. The experiment was conduzed in chamber at temperature of 25±2°C and relative humidity of 70±5%, photoperiod of 14:10. It was concluded that the dose of 200 Gy on pupae was sufficient to induzed the sterilizing. emerged daysold days old 0control, 0control control 0 , 0(control) 50 100 125 150 17 20 215 2 15 2.1 kGyhour kGy hour kGy/hour Mi FnFi Fn Fi Mn treatment 252C C 25 705 70 5 70±5% 1410. 1410 14 10. 10 14:10 0(control 12 1 21 2. 7 70±5 141 14:1 70± 14: