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Bionomics of Trioxys Binodoxys Subba Rao Sharma, an aphidiid parasitoid of Aphis craccivora Koch 7 Sex ratio of the parasitoid in field population



Bionomics of Trioxys Binodoxys Subba Rao Sharma, an aphidiid parasitoid of Aphis craccivora Koch 7 Sex ratio of the parasitoid in field population



Entomon 54: 269-275



The predominance of the females over males of T. indicus was observed in each sample except in smaller ones (n < 12) which were collected either early or late in the season. The mean proportion of the females was 67% which significantly (P = 0.001, .chi.2-test) deviates from an expected sex ratio of 50:50. About 92% females in the field population were mated, reflecting the existence of an efficient mate finding and copulatory mechanisms. The sex ratio varies during the season. Males emerged earlier than the females from the diapausing mummies in the field. The results are explained and discussed.

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