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The incidence of Heliothis armigera (Hübner) and H. punctigera Wallengren (Lepidoptera: Noctuidae) on cotton and other host-plants in the Namoi Valley of New South Wales

Published online by Cambridge University Press:  10 July 2009

K. G. Wardhaugh ,
P. M Room  and
L. R Greenup
K. G. Wardhaugh
Affiliation:
CSIRO Cotton Research Unit, P.O. Box 59, Narrabri, N.S.W. 2390, Australia
P. M Room
Affiliation:
New South Wales Department of Agriculture, P.O. Box K 220, Haymarket, N.S.W. 2000, Australia
L. R Greenup
Affiliation:
CSIRO Cotton Research Unit, P.O. Box 59, Narrabri, N.S.W. 2390, Australia
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Abstract

Four years of light-trap and crop survey data from the Namoi Valley of New South Wales are presented for Heliothis armigera (Hb.) and H. punctigera Wllgr. These suggest there are four generations a year. The associated seasonal sequence of major host-plants supporting successive generations, appeared to be: H. armigera—wheat; pre-flowering cotton; flowering cotton and sorghum; sorghum, flowering cotton and sunflowers; and H. punctigera—lucerne, linseed and medics; pre-flowering cotton; flowering cotton, sunflowers and soyabeans; lucerne, linseed and medics; pre-flowering cotton. On host-plants common to both species, a change in dominance from H. punctigera to H. armigera occured as each summer progressed. Suggested causes are: seasonal changes in the availability of host-plants, favouring H. armigera over H. punctigera; insecticide resistance in H. armigera; and the competitive superiority of H. armigera. Large numbers of H. armigera in cotton appeared to be related to: warm springs, which favoured moth emergence during the period of wheat anthesis; the incomplete control of infestations within cotton itself, leading to the development of resident populations; and the influx of moths from other host-plants, especially sorghum, during the latter half of the season.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 70 , Issue 1 , March 1980 , pp. 113 - 131
Copyright
Copyright © Cambridge University Press 1980

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