Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-28T05:14:28.008Z Has data issue: false hasContentIssue false
  • English
  • Français

MORTALITY FACTORS AFFECTING EGGS OF THE FOREST TENT CATERPILLAR, MALACOSOMA DISSTRIA (LEPIDOPTERA: LASIOCAMPIDAE)12

Published online by Cambridge University Press:  31 May 2012

J. A. Witter  and
H. M. Kulman
J. A. Witter
Affiliation:
Department of Entomology, Fisheries, and Wildlife, University of Minnesota, St. Paul
H. M. Kulman
Affiliation:
Department of Entomology, Fisheries, and Wildlife, University of Minnesota, St. Paul
Get access Rights & Permissions [Opens in a new window]

Abstract

Parasitism, infertility, and death of fully developed first-stage larvae in eggs (pharate larvae) were the egg mortality factors encountered during a 1967–69 study on the bionomics of the forest tent caterpillar, Malacosoma disstria Hübner, in northern Minnesota. There was no significant difference in the average yearly per cent parasitization and infertility per egg mass; these ranged from 7 to 10% and 1 to 3%, respectively. There was a year to year difference in pharate larval mortality. It ranged from 39% in 1968 to only 9 and 3% for 1967 and 969. Studies showed that egg masses had a tendency to be either nearly complete y hatched or unhatched only in 1968. The variation in pharate larval mortally in these studies suggests qualitative differences in the population. The pharate larval mortality has the potential of influencing population trends of the forest tent caterpillar.

Type
Articles
Information
The Canadian Entomologist , Volume 104 , Issue 5 , May 1972 , pp. 705 - 710
Copyright
Copyright © Entomological Society of Canada 1972

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Gautreau, E. J. 1964. Unhatched forest tent caterpillar egg bands in northern Alberta associated with late spring frost. Can. Dep. For., Forest Ent. Path. Br., Bi-mon. Prog. Rep. 20(3): 3.Google Scholar
Gorham, R. P. 1922. Insect pests of the year 1922 in New Brunswick. Acadian ent. Soc. Proc. 8: 18–22.Google Scholar
Hanec, W. 1966. Cold-hardiness in the forest tent caterpillar,Malacosoma disstria Hübner (Lepidoptera: Lasiocampidae). J. Insect Physiol. 12: 1443–1449.Google Scholar
Hodson, A. C. 1941. An ecological study of the forest tent caterpillar, Malacosoma disstria Hbn. Minn. Agric. Exp. Stn Tech. Bull. 148, 55 p.Google Scholar
Prentice, R. M. 1954. Decline of populations of the forest tent caterpillar in central Saskatchewan. Can. Dep. For., Forest Ent. Path. Br., Bi-mon. Prog. Rep. 10(5): 2.Google Scholar
Wellington, W. G. 1959. Individual differences in larvae and egg masses of the western tent caterpillar. Can. Dep. For., Forest Ent. Path. Br., Bi-mon. Prog. Rep. 15: 3–4.Google Scholar
Wellington, W. G. 1960. Qualitative changes in natural population during changes in abundance. Can. J. Zool. 38: 289–314.Google Scholar
Wetzel, B. W., Kulman, H. M., and Witter, J. A.. Effects of cold temperatures on hatching of the forest tent caterpillar, Malacosoma disstria Hübner. (In preparation.)Google Scholar
Witter, J. A. Bionomics of the forest tent caterpillar, Malacosoma disstria Hübner. Ph.D. Thesis, University of Minnesota, st. paul, 1971. 99 p.Google Scholar
Witter, J. A., Kulman, H. M., and Hodson, A. C.. 1972. Life tables for the forest tent caterpillar. Ann. ent. Soc. Am. 65: 25–31.Google Scholar