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Authors
Affiliations
1 International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, IN
2 Cyanamid (Singapore) Pvt. Ltd., 100 Cecil Street, #1201/02, The Globe, Singapore 069532, SG
Source
Journal of Biological Control, Vol 10, No 1&2 (1996), Pagination: 9-13
Abstract
Tetrastichus howardi (Olliff) was found to be a hyperparasitoid of the tachinids Goniophthalmus halli (Mesnil) and Senometopia (= Eucarcelia) illota (Curran) parasitising Helicoverpa armigera (Hubner) pupae in pigeonpea fields in South India. Fifty nine per cent of G. halli and S. illota pupae were parasitized by T. howardi resulting in a hyperparasitism rate of 1.9 per cent. Unlike previous studies, T. howardi was not recorded as a primary parasitoid of H. armigera pupae. Rather than behaving as a pupal guild parasitoid, the data suggest that T. howardi wasps oviposit in the larval stage of the tachinid parasitoids while they are developing inside the H. armigera pupa. The fact that T. howardi was not found to be a primary parasitoid of H. armigera pupae, suggests that this species is able to distinguish between parasitised and unparasitised H. armigera pupae.
Keywords
Goniophthalmus halli, Helicoverpa armigera, Hyperparasitoid, Pupal Parasitoids, Senometopia illota, Tetrastichus howardi.
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