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The Fungous Disease Caused by Entomophthora grylli Fres., and its Effects on Grasshopper Populations in Saskatchewan in 19631

Published online by Cambridge University Press:  31 May 2012

R. Pickford  and
P. W. Riegert
R. Pickford
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
P. W. Riegert
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
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Abstract

A widespread epizootic of the fungous disease caused by Entomophthora grylli Fres. occurred among grasshoppers in Saskatchewan in 1963. Camnula pellucida (Scudder), in particular, suffered high mortality and was nearly wiped out in those areas of central and east-central Saskatchewan where heavy infestations had been present. Weather was warm and humid during the outbreak with above normal rainfall in the seriously affected areas.

Field-cage studies showed that proper timing of rainfall was essential for continuation and spread of the disease. Rainfall shortly after death of the diseased grasshopper induced profuse growth of conidiophores along with intense discharge of conidia. When death occurred during hot, dry weather, no sporulation was noted and the insects rapidly dried up. The interval from infection to death of the grasshopper was about 13 days.

The fungous disease also developed in natural field populations of Melanoplus bivittatus Say, but none was noted in field cages where this grasshopper was being reared alongside of or together with C. pellucida that were dying continuously from the disease; this suggests that different strains of E. grylli were involved.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 9 , September 1964 , pp. 1158 - 1166
Copyright
Copyright © Entomological Society of Canada 1964

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References

Baird, R. B. 1957. Notes on a laboratory infection of Diptera caused by the fungus Empusa muscae Cohn. Canad. Ent. 89: 432–435.CrossRefGoogle Scholar
MacLeod, D. M. 1963. Entomophthorales infections. Ins. Pathol. 2: 189–231.CrossRefGoogle Scholar
Pickford, R. 1963. Wheat crops and native prairie in relation to the nutritional ecology of Camnula pellucida (Scudder) (Orthoptera: Acrididae) in Saskatchewan. Canad. Ent. 95: 764–770.CrossRefGoogle Scholar
Skaife, S. H. 1925. The locust fungus Empusa grylli and its effect on its host. S. Afr. J. Sci. 22: 298–308.Google Scholar
Steinhaus, E. A. 1949. Principles of insect pathology. McGraw-Hill, New York.Google Scholar
Treherne, R. C., and Buckell, E. R.. 1924. Grasshoppers of British Columbia. Bull. Domin. Can. Dep. Agric. 39, 1–47 pp.Google Scholar
Uvarov, B. P. 1928. Locusts and grasshoppers. Imperial Bureau of Entomology, London.Google Scholar
Walton, R. R., and Fenton, F. A.. 1939. Notes on Empusa grylli in Oklahoma. J. econ. Ent. 32: 155–156.Google Scholar