Feeding Pattern of Australian Heliothis1 on Cotton

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Abstract
The feeding patterns of Australian and North American Heliothis species on cotton are very similar. Field observations show that the later stages of larvae fed selectively on older fruit. In addition, there was a seasonal change which can be accounted to the shift in available fruit to the older age classes. Although H. punctigera and H. armigera are considered to prefer terminals and squares, and bolls, respectively, differences between them in feeding patterns can for the most part be attributed to the change in abundance of fruit in each age class as the season progresses. Heliothis larval feeding information has proven useful in simulation modeling of cotton- Heliothis interactions and is essential for assessing the relevance of current Heliothis thresholds.