Developmental Times of Heliothis zea and H. virescens (Lepidoptera: Noctuidae) Larvae and Pupae in Cotton 1

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Abstract
Field developmental times, expressed in day-degrees above 12.6°C, were estimated for the larval and pupal (i.e., prepupal plus pupal) stages of Hellothis zea (Boddie) and H. virescens (F.) reared on cotton. Means for larvae, female pupae, and male pupae were 238.9, 205.9, and 229.8, respectively, for H. zea ; and 225.2, 211.8, and 233.7, respectively, ror H. virescens . The interspecific difference in mean larval developmental times was significant. For both species, the variance of pupal developmental times was significantly larger for females than for males, and adult females began emerging well before the males. No significant interspecific differences in pupal developmental times occurred. Some implications of the results with regard to population dynamics studies and modeling are discussed.

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