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BIOLOGICAL ASPECTS OF Chrysoperla externa (HAGEN, 1861) (NEUROPTERA: CHRYSOPIDAE) FED ON EGGS AND LARVAE OF Spodoptera frugiperda (J.E.SMITH, 1797) (LEPIDOPTERA: NOCTUIDAE)

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Author(s): ALEXANDER MACHADO AUAD | CÉSAR FREIRE CARVALHO | BRÍGIDA SOUZA | LEONARDO RODRIGUES BARBOSA

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 2;
Issue: 1;
Start page: 106;
Date: 2002;
Original page

Keywords: biology: green lacewing | fall armyworm

ABSTRACT
The aim of this study was to evaluate the biological aspects of the green lacewing Chrysoperla externa (Hagen), fed on Spodoptera frugiperda (J.E. Smith) eggs and larvae. Larvae of the predator were individualized in glass tubes with 2.5 cm of diameter and 8.5 cm high maintained at 25 ± 2 ºC, 70 ± 10% RH and 12-hours photophase and fed on fall armyworm eggs of one or two-day-old and new hatched larvae. The developmental period and survival rate of each instar as well as pupal stage of the predator on different alimentary sources were evaluated in a completely randomized design with 25 replications. There was no significant difference in the developmental period of C. externa larvae fed on one or two-dayold fall armyworm eggs; however, those fed on larvae presented a longer developmental period. For the pupal stage no significant differences was verified regarding the larval feeding sources. First instar larvae of chrysopids fed on one or two-day-old eggs showed a lower survival rate. The same was not verified when larvae in that stage were fed on S. frugiperda larvae. In the 2nd and 3rd instars, the survical rates were not affected by the food source, with values over 86% being found in all treatments. The pupal survival rate was higher than 95%, independently of the stage of prey development.
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