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Analysis of long-term light-trap data for Helicoverpa spp. (Lepidoptera: Noctuidae) in Australia: the effect of climate and crop host plants

Published online by Cambridge University Press:  09 March 2007

D.A. Maelzer  and
M.P. Zalucki
D.A. Maelzer
Affiliation:
School of Land and Food, The University of Queensland, Gatton, Australia 4345 Department of Zoology and Entomology, The University of Queensland, St Lucia, Australia 4072
M.P. Zalucki*
Affiliation:
Department of Zoology and Entomology, The University of Queensland, St Lucia, Australia 4072
*
* Fax: (07) 3365 1922 E-mail: m.zalucki@mailbox.vq.edu.au
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Abstract

Regression analyses of a long series of light-trap catches at Narrabri, Australia, were used to describe the seasonal dynamics of Helicoverpa armigera (Hübner). The size of the second generation was significantly related to the size of the first generation, to winter rainfall, which had a positive effect, and to spring rainfall which had a negative effect. These variables accounted for up to 96% of the variation in size of the second generation from year to year. Rainfall and crop hosts were also important for the size of the third generation. The area and tonnage of many potential host crops were significantly correlated with winter rain. When winter rain was omitted from the analysis, the sizes of both the second and third generations could be expressed as a function of the size of the previous generation and of the areas planted to lucerne, sorghum and maize. Lucerne and maize always had positive coefficients and sorghum a negative one. We extended our analysis to catches of H. punctigera (Wallengren), which declines in abundance after the second generation. Winter rain had a positive effect on the sizes of the second and third generations, and rain in spring or early summer had a negative effect. Only the area grown to lucerne had a positive effect on abundance. Forecasts of pest levels from a few months to a few weeks in advance are discussed, along with the improved understanding of the seasonal dynamics of both species and the significance of crops in the management of insecticide resistance for H. armigera.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 89 , Issue 5 , May 1999 , pp. 455 - 463
Copyright
Copyright © Cambridge University Press 1999

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