Environmental Entomology (1981) 10, 177-179

David B. Hogg and Mario Calderon C. (1981)
Developmental times of Heliothis zea and H. virescens (Lepidoptera: Noctuidae) larvae and pupae in cotton
Environmental Entomology 10 (2), 177-179
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 Heliothis 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, for 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
population dynamics/ epidemiology

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa zea	Cotton (Gossypium)
	Heliothis virescens	Cotton (Gossypium)