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dc.contributor.authorOthim, S.T.O.
dc.contributor.authorRamasamy, S.
dc.contributor.authorKahuthia-Gathu, R.
dc.contributor.authorDubois, T.
dc.contributor.authorEkesi, S.
dc.contributor.authorFiaboe, K.
dc.date.accessioned2019-12-04T11:36:07Z
dc.date.available2019-12-04T11:36:07Z
dc.date.issued2019-06-18
dc.identifier.citationOthim, S.T.O., Ramasamy, S., Kahuthia-Gathu, R., Dubois, T., Ekesi, S. & Fiaboe, K. (2019). Effects of host age and density on the performance of Apanteles hemara (Hymenoptera: Braconidae), a larval endoparasitoid of Spoladea recurvalis (Lepidoptera: Crambidae). Journal of Economic Entomology, 1-11.
dc.identifier.issn0022-0493
dc.identifier.urihttps://hdl.handle.net/20.500.12478/6109
dc.description.abstractThe amaranth leaf-webber, Spoladea recurvalis (Fabricius; Lepidoptera: Crambidae), is a serious pest of Amaranthus sp. in Africa and Asia. Apanteles hemara (Nixon; Hymenoptera: Braconidae) is by far the most important larval endoparasitoid of the amaranth leaf-webber. We examined the effects of host density and age on the biological characteristics of A. hemara. The regression model of the number of hosts supplied to A. hemara against the number of larvae parasitized resulted in a curve corresponding to type II functional response, with a significant increase in the number of hosts parasitized up to the density of 30 hosts before being constant up to 40 hosts. In contrast, the parasitism rate decreased linearly with increasing host densities. Development time, sex ratio, and adult longevity were not significantly affected by host density. The immature parasitoid mortality was significantly higher at higher host densities. Apanteles hemara did not parasitize 7-d-old larvae and beyond, while parasitism was significantly higher among 1- to 2-d-old compared with 3- to 4-d-old larvae. Immature parasitoid mortality was 2.6 times higher in 1- to 2-d-old larvae compared with 5- to 6-d-old larvae. The developmental period of the parasitoid from egg to adult was longest among 1- to 2-d-old larvae and least among 5- to 6-d-old larvae. Nonreproductive mortality was markedly higher among 1- to 2-d-old larvae compared with the older larvae. Adult female A. hemara were significantly larger on 3- to 4-d-old larvae compared with either 1- to 2-d-old or 5- to 6-d-old larvae. We discuss the implications of our results for the interpretation of functional response in parasitoids, mass rearing, conservation, and augmentative biological control of S. recurvalis.
dc.description.sponsorshipGerman Federal Ministry for Economic Cooperation and Development
dc.format.extent1-11
dc.language.isoen
dc.rightsCopyrighted; all rights reserved
dc.subjectBiological Control
dc.subjectParasitism
dc.subjectMortality
dc.subjectSeed Figure
dc.subjectApanteles
dc.subjectLarvae
dc.titleEffects of host age and density on the performance of Apanteles hemara (Hymenoptera: Braconidae), a larval endoparasitoid of Spoladea recurvalis (Lepidoptera: Crambidae)
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationKenyatta University
cg.contributor.affiliationWorld Vegetable Center
cg.contributor.affiliationInternational Centre of Insect Physiology and Ecology
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.coverage.regionAfrica
cg.coverage.regionAsia
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectPests Of Plants
cg.journalJournal of Economic Entomology
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid106292
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1093/jee/toz165


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