Some aspects of oviposition byHeliothis armigerapertinent to cotton pest management in Thailand

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Abstract
Oviposition by Heliothis armigera (Hb.) on cotton in Thailand has been investigated in an attempt to contribute to the development of an effective pest management programme. Aspects studied include the spatial pattern of egg distribution, the effect of plant height and health on oviposition, comparative levels of oviposition in adjacent plots of differing ages and development, and egg wash‐off by rainfall. The results indicate that oviposition is not random and fits the negative binomial distribution, which is consistent with earlier findings elsewhere. The possibilities for the introduction of a sequential sampling system, based on the binomial distribution and comprising treatment level decisions determined by the proportion of terminals infested with eggs or small larvae, for Heliothis pest management in Thailand are discussed.