O extrato de neem (Azadirachta indica) causa alterações no desenvolvimento ninfal, no aparelho reprodutor e sistema digestivo do predador Supputius cincticeps (Heteroptera: Pentatomidae)? / Does the neem (Azadirachta indica) extract cause nymphal development, the reproductive system and digestive tract of the predator Supputius cincticeps (Heteroptera: Pentatomidae)?

AUTOR(ES)

Júlio César Melo Poderoso

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

21/02/2011

RESUMO

The subfamily Asopinae presents important species of predators, as Supputius cincticeps (Stal) (Hemiptera: Pentatomidae). These stinkbug present potential for the biological control of Lepidoptera defoliators in eucalyptus plantations in Brazil.Botanical insecticides, mainly neem (Azadirachta indica), are alternative for the control of herbivore insects of agroforestry system, but the impact of that botanical insecticide in stinkbug predators is poor studied. This research evaluated the impact of the neem in the survival of nymphs, adults morphometry, in the reproductive and digestive tract and cellular immune response of S. cincticeps. About 30% of the nymphs of that predator exposed to 1.0% neem solution had difficulties in the ecdysis from the third to the fourth instar. Of the total adult survivors of nymphs treated with this solution, 10% had deformities in the pronotum and wings. This solution insecticide reduced the percentage of living individuals by isntar. Females of S. cincticeps presented shorter ovariole (6.4mm), lower oocytes (22.4) and oocytes/ovarioles more developed (3.86) with 1.0% neem oil. Adult males of S. cincticeps, from second instar of nymphs of treated topically with 0.5 and 1.0 % had area of the testicles, similar (0.67 and 0.69 mm) respectively but smaller than in the control (0.75 mm2). Changes in in the digestive tract were not observed in S.cincticeps exposed to neem solutions. The adult of S.cincticeps cellular immune system was activated after four hours of the ingestion of the oil of neem seed. Three haemocytes types,plasmatocytes, prohemocytes and granulocytes were observed,but just, the plasmatocytes had the cellular dynamics affected after four hours of the ingestion of neen solution. The oil of neem seeds alter the morphometry of the reproductive system and it doesn t cause alterations in the digestive system of the stinkbug S. cincticeps.

ASSUNTO(S)

entomologia agricola asopinae percevejo predador controle biológico predator stinkbug biological control asopinae

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