Ephialtes brevicornis(Grav.) has been found to parasitise the prepupal stage ofPlutella maculipennis(Curt.) under laboratory conditions. A general description of the life-cycle ofE. brevicornisonP. maculipennisis given and it is found to occupy 16 days from egg to adult at 20°C. and a R.H. of 60 per cent. Comparative descriptions are given of the five larval instars. The egg is also described.
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A. M. Stuart (1957) studied this question.
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