Trioxys (Binodoxys) indicus Subba Rao & Sharma as a possible biological agent in the control of Aphis craccivora Koch.
The biology of Trioxys indicus parasitizing Aphis craccivora on pigeon pea (Cajanus cajan) was investigated in the laboratory and field in India. The parasite had a high searching ability and had a density-dependent relationship with its host. Its life cycle lasted 15-20 days, and an individual female parasitized 100-150 aphids in 3-5 days after adult emergence. A. craccivora appeared on pigeon pea in the field in the 2nd week of December, and continued to occur until the first week of April. T. indicus appeared in the field in about the 3rd week of December, parasitizing 9.4% of the aphid population; parasitism reached a peak of 64.6% in mid-February, resulting in suppression of the aphid population. The parasite tended to be oligophagous, parasitizing A. craccivora, A. gossypii (also on pigeon pea) and A. nerii. Up to 2.36% of the parasites were hyperparasitized by an unidentified cynipid. It was concluded that T. indicus had most of the attributes of a potential biological control agent against A. craccivora and A. gossypii.