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Biological Control of Insect Pests: Southeast Asian Prospects - EcoPort

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28 <strong>Biological</strong> <strong>Control</strong> <strong>of</strong> <strong>Insect</strong> <strong>Pests</strong>: <strong>Southeast</strong> <strong>Asian</strong> <strong>Prospects</strong><br />

CHAD<br />

Eleven species <strong>of</strong> parasitoid, 3 species <strong>of</strong> hyperparasitoid and nematodes<br />

were reared from A. flava larvae on cotton (Silvie et al. 1989; Silvie 1991).<br />

Total parasitisation never exceeded 25% and, in 1987, 15.7% <strong>of</strong> 485 A. flava<br />

larvae were parasitised. Details are shown in Table 4.2.4. The commonest<br />

parasitoid was Aleiodes aligharensi which, together with Aleiodes sp.<br />

accounted for nearly a third <strong>of</strong> all larvae parasitised. Three hyperparasitoids<br />

were recorded, about half emerging from species <strong>of</strong> Aleiodes. The most<br />

abundant was Mesochorus (= Stictopisthus) africanus (Ichneumonidae)<br />

followed by Nesolynx phaeosoma (Eulophidae) and Eurytoma syleptae<br />

(Eurytomidae). All three species were also reared from parasitised larvae <strong>of</strong><br />

other host species (Silvie et al. 1989; Silvie 1991).<br />

Table 4.2.4 Natural enemies <strong>of</strong> A. flava larvae on cotton in Chad<br />

Species % <strong>of</strong> total larvae<br />

parasitised<br />

Primary parasitoids<br />

DIPTERA<br />

Other hosts<br />

TACHINIDAE<br />

Winthemia dasyops 15.8 Chrysodeixis acuta<br />

HYMENOPTERA<br />

BRACONIDAE<br />

Aleiodes aligharensi 32.9 Earias sp.<br />

Aleiodes sp. Helicoverpa armigera<br />

Apanteles syleptae 1.3 Syllepte derogata<br />

Nyereria sp. 1.3 Syllepte derogata<br />

Parapanteles sp. 5.3<br />

Protomicroplitis sp.<br />

CHALCIDIDAE<br />

3.9<br />

Brachymeria nr aliberti<br />

ICHNEUMONIDAE<br />

1.3<br />

Enicospilus dolosus 9.2<br />

NEMATODA<br />

Hyperparasitoids<br />

ICHNEUMONIDAE<br />

1.3<br />

Mesochorus (= Stictopisthus) africanus 4.0<br />

Dead parasitoids 23.7

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