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Bionomics of trioxys indicus an aphidiid parasitoid of aphis craccivora 26. impact of host extract on the oviposition response of the parasitoid



Bionomics of trioxys indicus an aphidiid parasitoid of aphis craccivora 26. impact of host extract on the oviposition response of the parasitoid



Biological Agriculture and Horticulture 5(2): 169-176



Female Trioxys indicus, an aphidiid parasitoid of the pigeonpea aphid Aphis craccivora, responded to aqueous extracts of the host topically sprayed on to host-infected leaves by examining such areas intensely with their antennae. The host-extract application reduced the host search-time, thus increasing the probability of finding more hosts. By increasing the concentration of the host-extract on the host-patch, the frequencies of host contact, prick and oviposition behaviour increased significantly. Similarly, the retention period of the parasitoids with the hosts significantly increased which, when combined with their intensified behaviour, resulted in a higher degree of host parasitisation. The females parasitised 60% more hosts under host-extract exposure (200 aphid/ml) than with the control. Their area of discovery increased expotentially with increasing host-extract concentration. These studies suggest the value of using the host-extract in the mass culture of the parasitoid in the laboratory. The active ingredients functioning as host-seeking stimulants (kairomones) in the host-extract have yet to be investigated.

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Accession: 004841340

Download citation: RISBibTeXText

DOI: 10.1080/01448765.1988.9755138


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