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Bionomics of Trioxys Binodoxys indicus, an aphidiid parasitoid of Aphis craccivora 3 Numerical aspects of the interaction of the parasitoid and its host



Bionomics of Trioxys Binodoxys indicus, an aphidiid parasitoid of Aphis craccivora 3 Numerical aspects of the interaction of the parasitoid and its host



Entomologia Experimentalis et Applicata 282: 167-176



Laboratory experiments on the numerical aspects of the interaction of T. (Binodoxys) indicus Subba Rao et Sharma and its aphid host A. craccivora Koch are described. If 1, 2, 3, 4 or 5 parasitoids are released on 25, 50, 75 or 100 hosts, the number of parasitoids emerging is greatest when 4 or 5 are put on. The rate of multiplication (i.e., parasitoids emerging/parasitoids at start) is greatest with 1 parasitoid on 100 hosts; this rate of multiplication declines as more parasitoids or fewer hosts are put in. The fact that more parasitoids have a lower rate of multiplication shows the existence of interference processes. Various aspects of the parasitoids' behavior which give rise to interference effects are discussed, including the experimental study of the mortality of the hosts from repeated pricking by parasitoids' ovipositors.

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