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Host preference studies on Trichogramma sp. nr. mwanzai Schulten and Feijen (Hymenoptera: Trichogrammatidae) in Kenya

Published online by Cambridge University Press:  19 September 2011

Lu Qing Guang  and
G. W. Oloo
Lu Qing Guang
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P. O. Box 30, Mbita, Kenya
G. W. Oloo
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P. O. Box 30, Mbita, Kenya
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Abstract

Host preference studies were conducted on Trichogramma sp. nr. mwanzai at 25 ± 2°C, 40–60% r. h. In the laboratory, using eggs of C. partellus, B. fusca, E. saccharina, S. cerealella and B. mori in choice and no-choice tests. Adults emerged within 9–10 days; ca. 70% parasitoids of both sexes emerged and mated between 0800–1000 hr, with a peak at 0800 hr. There was no significant difference (P < 0.05) between the number of progeny per female from eggs of C. partellus (33.9 ± 9.2), B. fusca (30.1 ± 4.5) and S. cerealella (30.9 ± 9.9) in no-choice tests, but progeny production was significantly less from E. saccharina and no parasitoid emerged from B. mori. In host age selection tests on C. partellus, there was no significant difference (P < 0.05) between the number of offspring per female from eggs of age groups 0–2 days; offspring of day 3 were significantly less, and no parasitoid emerged from day 4 eggs. Up to 4 (mean, 1.9 ± 0.6) adults emerged from a single egg of C. partellus. Since mass rearing technology exists for C. partellus and is available at ICIPE, it was concluded that day 0–2 eggs of this borer are more suitable for mass production of T. sp. nr. mwanzai.

Résumé

Les etudes de la préférence de l'hôte ont été conduites sur Trichogramma sp. nr. mwanzai à 25 ± 2°C, 40–60% HR au laboratoire, utilisant les oeufs de C. partellus, B. fusca, E. saccharina, S. cerealella et B. mori par tests a seul et à plusieurs alternatives. Les adultes emergeaient en 9–10 jours; approximativement 70% de parasitoides de deux sexes emergeaient et s'accouplaient de 0800–1000h avec un maximum à 0800h. Il n'yavait pas de différence significative (P < 0.05) entre le nombre de la descendance/femelle venue des oeufs de C. partellus (33.9 ± 9.2), B. fusca (30.1 ± 4.5) et S. cerealella (30.9 ± 9.9) dans le test à seule alternative, mais la progeniture était moins significative pour E. saccharina et pas d'emergence, de parasitoides venus de B. mori. Dans les tests de la sélection de, l'âge de l'hôte sur C. partellus, il n'yavait pas de différence significative (P < 0.05) entre le nombre de la descendance/femelle venue des oeufs de groupes d'âge 0–2 jours; la progeniture à partir du 3 me jour etait significativement inférieure et pas d'emergence de parasitoides de oeufs à partir du 4 me jour. De 4 (moyeune 1.9 ± 0.6) adultes emergaient d'un simple oeuf du C. partellus. Depuis l'existance de la technologie de multiplication en masse pour C. partellus, il a été conclu que les oeufs de 0–2 jours de ce boreur sont plus indiques pour la production en masse de T. sp. nr. mwanzai.

Keywords

Trichogramma sp. nr. mwanzaiemergence patternhost preferencemass production
Type
Biological Control
Information
International Journal of Tropical Insect Science , Volume 11 , Special Issue 4-5: Tropical Stem Borers of Graminaceous Crops: A New Synthesis , October 1990 , pp. 757 - 763
Copyright
Copyright © ICIPE 1990

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