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Bionomics of Trioxys indicus Hym Aphidiidae, a parasitoid of Aphis craccivora Hem Aphididae 31 Effect of host haemolymph on the numerical response of the parasitoid



Bionomics of Trioxys indicus Hym Aphidiidae, a parasitoid of Aphis craccivora Hem Aphididae 31 Effect of host haemolymph on the numerical response of the parasitoid



Entomophaga 344: 581-586



The influence of kairomones on the numerical response of the parasitoid Trioxys indicus against its host Aphis craccivora at its varying density was studied. The kairomones (applied as aqueous extract of the host) significantly enhanced the rate of parasitisation and multiplication and the area of discovery of the parasitoid and also the K-values of mortality of the host at all parasitoid densities introduced (1, 2, 4, 8, 12 and 16 parasitoids) into troughs having about 200 hosts. The sex-ratio of F1 offspring decreased at lower parasitoid densities and remained more or less unchanged at higher parasitoid densities after the application of kairomones. The present findings indicate that if kairomones are applied properly, the number of hosts destroyed by a stimulated parasitoid will be about 200, twice the number reported earlier, thus fewer parasitoids will be needed to regulate an estimated population of the hosts.

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