Eggs of Heliothis armigera and H. punctigera were exposed once to a high temperature (35–44°C) at 2 humidities for various periods (1/12–4 h) 12–24 h after oviposition. In both species exposure to 35 and 38°C had little affect on hatching, but prolonged exposures to temperatures above 38°C decreased it. H. punctigera eggs withstood short exposures to high temperatures better than H. armigera . Long exposures to high temperatures retarded development in both species. H. punctigera required more time than H. armigera to complete development at all temperature‐exposure combinations. High humidity prolonged development at high temperatures(> 35°C).
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Qayyum et al. (1987) studied this question.
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