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A QUANTITATIVE EVALUATION OF GRASSHOPPER (ORTHOPTERA: ACRIDIDAE) DAMAGE AND ITS EFFECT ON SPRING WHEAT1

Published online by Cambridge University Press:  31 May 2012

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

Studies were carried out to investigate the growth response of normal and defoliated spring wheat. Plant growth is expressed by the von Bertalanffy (1957) growth equation modified to allow for declining growth potential with age. Grasshopper damage was assessed by comparison with artificial defoliation and results indicated a simple linear relationship between grasshopper food consumption and defoliation damage. On the basis of this relationship it indicated that grasshoppers feeding on wheat waste 6.2 times as much foliage as they actually consume. Damage to foliage is translated into an effect on grain yield by an allometric relationship between total plant weight and yield. A simulation model indicating the time course of plant biomass provides realistic estimates except in the case of acute defoliation.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 3 , March 1976 , pp. 255 - 270
Copyright
Copyright © Entomological Society of Canada 1976

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