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AERIAL PHOTOGRAPHY FOR DETECTION AND ASSESSMENT OF GRASSHOPPER (ORTHOPTERA: ACRIDIDAE) DAMAGE TO SMALL GRAIN CROPS IN SASKATCHEWAN1

Published online by Cambridge University Press:  31 May 2012

O. O. Olfert ,
S. H. Gage ,
M. K. Mukerji  and
R. L. Randell
O. O. Olfert
Affiliation:
Research Station, Agriculture Canada, Saskatoon, Saskatchewan S7N 0X2
S. H. Gage
Affiliation:
Research Station, Agriculture Canada, Saskatoon, Saskatchewan S7N 0X2
M. K. Mukerji
Affiliation:
Research Station, Agriculture Canada, Saskatoon, Saskatchewan S7N 0X2
R. L. Randell
Affiliation:
Biology Department, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0X2
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Abstract

Aerial colour infra-red photographs were used to detect grasshopper damage to cereal grains, determine extent of damage, estimate crop yield, and identify crops. The detection and identification of grasshopper damage was facilitated by the development of a dichotomous key which differentiates grasshopper damage from other crop anomalies. Crop types and yield were determined from correlations between the optical density of the photographs and the biomass of standing crops.

Cost of an aerial survey was estimated at $0.02 per hectare as compared with ground survey cost of $0.20 per hectare. Information provided by an aerial survey of damage has the potential to assist grain growers, extension personnel, and researchers in evaluating the influence of grasshoppers on grain production

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 6 , 01 June 1980 , pp. 559 - 566
Copyright
Copyright © Entomological Society of Canada 1980

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