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Bionomics of trioxys indicus an aphidiid parasitoid of aphis craccivora 13. host selection by the parasitoid



Bionomics of trioxys indicus an aphidiid parasitoid of aphis craccivora 13. host selection by the parasitoid



Zeitschrift fuer Angewandte Entomologie 93(1): 64-75



T. (Binodoxys) indicus parasitizes mostly A. craccivora and A. gossypii and does not show significant affinity for others. The parasitoid, at first, is attracted towards certain plants that harbor the acceptable host species irrespective of the presence of host. It is the chemical clue.sbd.allomone.sbd.that helps parasitoid search for host-habitat. The parasitoid is attracted towards hosts (aphids) by sensing their kairomonal secretions. The olfactory receptors are located in the antennae of the parasitoid. Gustation of the honeydew excreted by the aphid helps the parasitoid by reducing the host approaching period. Sight is helpful in proper orientation with respect to the host after she has recognized them. Host-acceptance is attributed to a number of factors. The 3rd instar nymph of A. craccivora is most acceptable for parasitization. Aphid-movement and colored light have nothing to do in host acceptance by T. indicus. The aphid is not paralyzed during parasitization. Laterals of the body of the aphid are most preferred sites for pricking. Abdomen of the host is maximally pricked and also received the maximum number of eggs of the parasitoid.

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