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ASSESSMENT OF LOSS IN YIELD OF WHEAT CAUSED BY THE MIGRATORY GRASSHOPPER, MELANOPLUS SANGUINIPES (ORTHOPTERA: ACRIDIDAE)1

Published online by Cambridge University Press:  31 May 2012

R. Pickford  and
M. K. Mukerji
R. Pickford
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
M. K. Mukerji
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
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Abstract

Studies on the damage and losses of wheat crop caused by the migratory grasshopper, Melanoplus sanguinipes (Fabr.), were carried out under field conditions during 1972 and 1973. A significant inverse relationship was evident between grasshopper density and grain yield. Loss in yield may occur due to grasshopper infestation in different ways: (1) early hatching of grasshoppers may completely destroy newly-germinated seedlings; (2) a gradual defoliation of the crop throughout the growing season reduces yield and grade of the seed due to reduction of plants’ photosynthetic efficiency; (3) headclipping occurs towards the end of the season when leaves have been completely destroyed. The role of weather factors in shaping the impact of grasshoppers on the crop is discussed.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 11 , November 1974 , pp. 1219 - 1226
Copyright
Copyright © Entomological Society of Canada 1974

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