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Gryon flavipes (Ashmead) [Hymenoptera, scelionidae], an egg-parasite of the rice earbugLeptocorisa oratorius (Fabricius) [Hem. Alydidae]

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Abstract

Gryon flavipes (Ashmead) is an egg-parasite of the rice earbug,Leptocorisa oratorius (Fabricius) in Sarawak. The life cycle is completed in 10–16 days. One larva develops per host egg, and maximum parasitism varies between 40–90%. Parasitism is at least partially density-dependent but does not prevent the build-up ofLeptocorisa numbers.

Résumé

A l'occasion des recherches écologiques poursuivies de 1964 à 1968 à Sarawak (Bornéo) sur la punaise du Riz:Leptocorisa oratorius (Het. Alydidae), des observations ont été faites sur la biologie deGryon flavipes Ashmead, Scelionide parasite des œufs de cette punaise.

Le développement de l'œuf à l'imago demande 10 à 15 jours.Gryon parasite 26 à 75% des œufs deLeptocorisa dans les champs de riz. Les œufs-hôtes sont décelés par le parasite même lorsqu'ils sont peu nombreux et très espacés. Néanmoins, il est rare que plus de 50% des œufs d'une même ponte (groupant en moyenne une dizaine d'œufs) soient attaqués. Il semble exister une corrélation positive entre le nombre des œufs présents dans la culture et l'importance du parasitisme.

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  1. Department of Agriculture, Kuching, Sarawak, Malaysia

    G. H. L. Rothschild

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  1. G. H. L. Rothschild
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Rothschild, G.H.L. Gryon flavipes (Ashmead) [Hymenoptera, scelionidae], an egg-parasite of the rice earbugLeptocorisa oratorius (Fabricius) [Hem. Alydidae]. Entomophaga 15, 15–20 (1970). https://doi.org/10.1007/BF02371623

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