Predatory capacity and functional response of Ceraeochrysa cubana (Hagen, 1861) (Neuroptera: Chrysopidae) fed on Aphis gossypii Glover, 1877 (Hemiptera: Aphididae) in cucumber / Capacidade predatÃria e resposta funcional de Ceraeochrysa cubana (Hagen, 1861)(Neuroptera: Chrysopidae) alimentada com Aphis gossypii Glover, 1877 (Hemiptera: Aphididae) em plantas de pepino

AUTOR(ES)

Eliana Alcantra

DATA DE PUBLICAÇÃO

2006

RESUMO

Evaluating some biological aspects, the predatory capacity at three temperatures and the functional responses of larvae of Ceraeochrysa cubana (Hagen) fed third and fourth instar nymphs of Aphis gossypii Glover was sought. The experiments were conducted in the Laboratory of the EcoCentro/CTSM-EPAMIG, Lavras, MG, in climatic chambers at 22; 25 and 28Â1oC, 70% of RH and 12-hour photophase. The experimental design for the study of the biological aspects and predatory capacity was completely randomized with three treatments represented by the temperatures by utilizing 40 larvae per treatment. For the functional response, the treatments were represented by the five densities of aphid nymphs with 10 replicates. A reduction in the median lifetime time of the instars of the stages of pre-pupa and pupa was found as related with the increase of temperature. The range of temperature of 22 to 28oC proved ideal for the development of these green lacewings; however the highest survivals, for the stages of larva, pre-pupa and pupa and for the period of larva to adult, were obtained in the temperature of 22oC. The daily average and total consumption of aphids by larvae of C. cubana increased in each instar at all the temperatures. For larvae of first instar, there were no significant differences in the daily average consumption of aphids at the three temperatures. For second and third instar larvae, there was higher consumption of aphids at the highest temperature. The total average number of aphids consumed by first and second instar larvae did not differ as related with the increase of temperature. For third instar larvae, the greatest total consumption total was observed at 22oC, and the lowest consumption at 25oC. The lowest temperature enabled the highest total average consumption of the larval stage. The functional response for larvae of C. cubana was of Type II in the shape of linear rise. The search time did not differ as related with the predatorâs stage, whilst the handling time decreased progressively with the larvaâs development, its being greater for those of first instar.

ASSUNTO(S)

capacidade predatÃria predatory capacity resposta funcional ceraeochrysa cubana functional response entomologia agricola aphis gossypii ceraeochrysa cubana aphis gossypii

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