Effets d'un extrait de neem (Azadirachta indicaA. Juss) sur le développement deForficula auriculariaL (Dermaptera)

Autor: C. Lenfant, F. Sureau, Benoît Sauphanor
Rok vydání: 1995
Předmět:
Zdroj: Journal of Applied Entomology. 119:215-219
ISSN: 1439-0418
0931-2048
Popis: Effects of a neem seed extract (Azadirachta indica A. Juss) on the development of the Dermaptera, Forficula auricularia L.: Young nymphs and adults of the European earwig, Forficula auricularia L., were exposed in the laboratory and in the field to an extract from seed kernels of the neem tree, Azadirachta indica A. Juss. No effect was observed on mortality, weight, food intake or fecundity of adults when treated directly in the laboratory with 50 ppm of azadirachtin. None of the second instar nymphs treated by contact with the fresh residue or fed on medium treated with 25, 50, or 250 ppm of the product could achieve their development. The nymphs exhibited a decrease of food intake and of ponderal growth a few days after the treatment, as well as an increase of the intermoulting delay. Behavioural tests revealed no repellent or antifeedant effect of the product. Applications in peach tree orchards resulted in a 70% reduction of nymphal population of earwigs. Neem products could be used to reduce earwig populations if applied when young instars are present. They should therefore be avoided during this period on crops where these insects need to be preserved because of their predation on aphids.
Databáze: OpenAIRE
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