אסיף מאגר המחקר החקלאי

Biological and ecological studies of the parasitoid Chelonus inanitus [Hym.: Braconidae] in Israel - I. Distribution, abundance and parasitism in natural host populations

Year:

1975

Source of publication :

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Volume :

20

Co-Authors:

Rechav, Y., Division of Entomology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

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Abstract:

Only one species of ChelonusPanzer, Chelonus inanitus (L.), was found to be widespread in all areas of Israel. The parasitoid was particularly widespread in alfalfa fields but also was present in cotton, sugar beet, artichoke and corn. Spodoptera littoralis (Boisd) and S. exigua (Hbn.) were the main hosts of C. inanitus although it might develop in other Lepidoptera species. A study of its population showed that adults were present in the spring, summer and autumn but not during the winter. In most cases the population density of the parasitoid appeared to be related to that of the hosts. Parasitism and sex ratio of C. inanitus in alfalfa fields were studied. The number of males (average of 75%) was higher than that of the females. Percentage of parasitism in larvae of S. littoralis and S. exigua reached up to 39.8% and 13.5% respectively. The parasitism values in eggs of S. littoralis were up to 71%. © 1975 Le François.

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