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Observations on Feeding Habits of First-instar Larvae of the Pale Western Cutworm, Agrotis orthogonia Morr. (Lepidoptera: Phalaenidae)1

Published online by Cambridge University Press:  31 May 2012

L. A. Jacobson ,
P. E. Blakeley  and
C. W. Farstad
L. A. Jacobson
Affiliation:
Field Crop Insect Laboratory, Lethbridge, Alberta
P. E. Blakeley
Affiliation:
Field Crop Insect Laboratory, Lethbridge, Alberta
C. W. Farstad
Affiliation:
Field Crop Insect Laboratory, Lethbridge, Alberta
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Extract

The pale western cutworm, Agrotis orthogonia Morr., has been a major pest of cereals in the prairie region of Western Canada since 1911. Present control measures consist of (a) cultural measures that inhibit oviposition in fields being summer-fallowed and (b) starvation of the young larvae by destroying the volunteer plant growth by means of cultivation at a critical period. Cultural operations to minimize oviposition in fields being summer-fallowed have become accepted procedure throughout the area. Control by starvation is practised during outbreak years in fields that have-been “stubbled in” or in those tilled during the moth flight. This procedure has been recommended generally throughout potentially infested areas, but more precise methods of evaluating larval numbers are required so that control may be used only where critical populations are present.

Type
Articles
Information
The Canadian Entomologist , Volume 82 , Issue 9 , September 1950 , pp. 181 - 185
Copyright
Copyright © Entomological Society of Canada 1950

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References

1.Cook, W. C.Field studies of pale western cutworm (Porosagrotis orthogonia Morr.). Montana Agr. Expt. Sta. Bull. 225. 1933.Google Scholar
2.Seamans, H. L.The pale western cutworm and its control. Canada Dept. Agr. Pub. 615. 1938.Google Scholar
3.Webster, R. L., and Ainslie, C. N.. Pale western cutworm in North Dakota. North Dakota Agr. Coll. Bull. 179. 1924.Google Scholar