Environmental Entomology (1990) 19, 1055-1059

J.L. Bossart and Stuart H. Gage (1990)
Biology and seasonal occurrence of Manduca quinquemaculata and M. sexta (Lepidoptera: Sphingidae) in southwestern Michigan
Environmental Entomology 19 (4), 1055-1059
Abstract: The seasonal occurrence and development of field populations of Manduca quinquemaculata (L.) and Manduca sexta (Haworth) were monitored at the Kellogg Biological Station in Barry County, Mich., from late June to early September during 1985 and 1986. Results indicated that initial and peak oviposition were variable between years for both species and were not predictable by accumulated degree-days (DD), base 10°C. In both years, initial egg deposition occurred slightly earlier for M. quinquemaculata than for M. sexta (DD 615 versus DD 728 in 1985 and DD 700 versus DD 742 in 1986), whereas peak oviposition was dependent upon the year in question. In 1985, oviposition for M. quinquemaculata peaked approximately 100 DD earlier than for M. sexta. In 1986, the reverse was observed. Larval development occurred at the same rate in both species and was closely associated with degree-day accumulation requiring, on the average, 39 DD per stadium. Monitoring data from both years indicated that M. quinquemaculata is likely univoltine in Michigan whereas M. sexta is probably bivoltine.
(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:
population dynamics/ epidemiology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Manduca sexta		U.S.A. (NE)
	Manduca quinquemaculata		U.S.A. (NE)