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Overwintering and spring emergence of Heliothis armigera (Hübner) (Lepi–doptera: Noctuidae) in the Namoi Valley, New South Wales

Published online by Cambridge University Press:  10 July 2009

A. G. L Wilson ,
T. Lewis  and
R. B. Cunningham
A. G. L Wilson
Affiliation:
CSIRO Cotton Research Unit, P.O. Box 59, Narrabri, New South Wales, 2390, Australia.
T. Lewis
Affiliation:
CSIRO Division of Mathematics and Statistics, P.O. Box 1963, Canberra City, A.C.T., 2601, Australia.
R. B. Cunningham
Affiliation:
CSIRO Division of Mathematics and Statistics, P.O. Box 1965, Canberra City, A.C.T., 2601, Australia.
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Abstract

The overwintering of Heliothis armigera (Hb.) was studied in the Namoi Valley, north-western New South Wales, Australia. In field observations, over 80% of pupae formed during late April and May were found to be in diapause and did not resume development until September. Moth emergence from diapausing pupae occurred in a protracted period between September and November. Laboratory studies indicated the probability of two phases of diapause development, one completed under cool soil conditions of winter and a second requiring a temperature above about 17° C. The threshold of the second phase was higher than that for non-diapausing pupae and was not normally reached until late September. The times to diapause termination in populations of overwintering pupae were satisfactorily fitted to a geometric distribution, which was reflected in the protracted emergence period of moths in field cages. The limited availability of suitable host-plants for the overwintering generation and for emerging moths is discussed.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 69 , Issue 1 , April 1979 , pp. 97 - 109
Copyright
Copyright © Cambridge University Press 1979

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