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Characteristics Of Parasitism Of Plutella Xylostella (Lep., Plutellidae) By Oomyzus Sokolowskii (Hym., Eulophidae)

Caractéristiques du parasitisme de Plutella xylostella (Lep. : Plutellidae) par Oomyzus sokolowskii (Hym. : Eulophidae)

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Abstract

Laboratory and greenhouse studies were conducted on Oomyzus sokolowskii Kurdjumov, a parasite of the crucifer pest Plutella xylostella ( L.). O. sokolowskii preferred the 3rd and 4th instar P. xylostella larvae over fresh pupae for parasitization. It is thus a larval parasite. Within the range of 10‡C to 35‡C, parasitism was positively correlated with temperature. High parasitism at temperatures of 30‡C and 35‡C indicates that this insect is suitable for the control of P. xylostella in the tropical lowlands. In a no- choice test where only fresh pupae of Cotesia plutellae Kurdjumov, another potentially competing larval parasite of P. xylostella, were offered, O. sokolowskii failed to parasitize pupae of C. plutellae. In a choice test where the 4th instar P. xylostella larvae and fresh C. plutellae pupae were offered, O. sokolowskii parasitized only P. xylostella larvae. This parasite, therefore, is not a hyperparasite of P. xylostella. When C. plutellae-ovvposited P. xylostella larvae were offered at intervals, O. sokolowskii, parasitized only freshly oviposited host larvae. The longer the period that elapsed after C. plutellae oviposition of P. xylostella larvae, the lesser was the parasitism of these larvae by O. sokolowski.

Rèsumè

Des études en laboratoire et en serre ont été faites sur Oomyzus sokolowskii Kurdjumov, un parasitoÏde de Plutella xylostella (L.), ravageur des crucifères. O. sokolowski préfère parasiter les larves de 3 ‡ et 4 ‡ stade de P. xylostella plutÔt que les nymphes fraÎches. C’est donc un parasitoÏde larvaire. Entre 10 ‡C et 35 ‡C, le parasitisme est positivement corrélé à la température. Un parasitisme élevé constaté aux températures de 30 et 35 ‡C indique que cet insecte peut Être utilisé pour lutter contre P. xylostella dans les basses plaines tropicales. Dans une expérience sans choix où seules étaient offertes des pupes fraÏches de Cotesia plutellae Kurdjumov, autre parasitoÏde larvaire de P. xylostella pouvant entrer en concurrence avec ce parasitoÏde, O. sokolowski ne réussit pas à parasiter les pupes de C. plutellae. Dans une expérience où le choix entre des larves de P. xylostella du 4‡ stade et des pupes fraÎches de C. plutellae était possible, O. sokolowski a parasité seulement les larves de P. xylostella. Ce parasitoÏde n’est donc pas un hyperparasÏtoide de P. xylostella. Quand on présente des larves de P. xylostella parasitées par C. plutellae depuis plus ou moins longtemps, O. sokolowski ne parasite que les larves hÔtes fraÎchement parasitées. Plus l’intervalle de temps depuis l’oviposition de C. plutellae sur les larves de P. xylostella est long, moins le parasitisme de ces larves par O. sokolowski est élevé.

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Talekar, N.S., Hu, W.J. Characteristics Of Parasitism Of Plutella Xylostella (Lep., Plutellidae) By Oomyzus Sokolowskii (Hym., Eulophidae). Entomophaga 41, 45–52 (1996). https://doi.org/10.1007/BF02893291

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