Information on the likely tinting of Autumn diapause induction in Helicoverpa is useful for growers planning to cultivate cotton stubble for &quote;pupae busting&quote;. Cultivation to control pupae is mandatory for INGARD cotton, and it is recommended for conventional cotton as part of the Australian Insecticide Resistance Management Strategy (Forrester and Bird 1996). The benefits of controlling H. armigera pupae in this way have been extensively published within the cotton industry (Slack-Smith et al 1997, Fitt et al 1993, Wilson 1993, Murray and Titmarsh 1990).