Annals of Applied Biology (2004) 144, 17-26

S. Duffield (2004)
Evaluation of the risk of overwintering Helicoverpa spp. pupae under irrigated summer crops in south-eastern Australia and the potential for area-wide management
Annals of Applied Biology 144 (1), 17-26
Abstract: Surveys were undertaken to determine the distribution of overwintering pupae of two species of Helicoverpa in south-eastern Australia. The results indicate that significant populations of H. armigera have the potential to overwinter as pupae in the region under residues of their summer crop hosts. H. punctigera, conversely, was found not to overwinter in the region to any significant degree. The results also suggest that a high proportion of the overwintering H. armigera population are located in relatively few high risk fields. The overwintering population represents an ideal opportunity for control on an area-wide basis using post harvest cultivation or "pupae busting". The risk of overwintering H. armigera pupae occurring was largely associated with crop type, the mechanism being related to the date that the crop flowers, the level of pupal parasitism and the use of larval control measures. The results are discussed in terms of recommendations for farmers and it is suggested that a concerted effort to cultivate high risk fields has the potential to significantly reduce the population on an area-wide basis.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Simon J. Duffield

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa armigera		Australia (South+SE)
	Helicoverpa punctigera		Australia (South+SE)