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AN OPTIMIZATION MODEL FOR LYGUS HESPERUS (HETEROPTERA: MIRIDAE) DAMAGE IN COTTON: THE ECONOMIC THRESHOLD REVISITED1

Published online by Cambridge University Press:  31 May 2012

A. P. Gutierrez ,
Y. Wang  and
Uri Regev
A. P. Gutierrez
Affiliation:
Division of Biological Control, University of California, Berkeley 94720
Y. Wang
Affiliation:
Division of Biological Control, University of California, Berkeley 94720
Uri Regev
Affiliation:
Department of Economics, Ben Gurion University, Beersheva, Israel
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Abstract

This paper presents results of a multidisciplinary optimization study on the impact of Lygus hesperus Knight on cotton in the Great Central Valley of California. The results of the empirical studies indicate that lygus bug is not a serious pest of cotton under most circumstances and, furthermore, illustrate why cotton yield enhancements have occurred when their populations have not been controlled. An economic analysis of these results sheds some light on the concept of economic threshold. In particular it is shown how in this case an economic threshold exists even if the costs of pesticides are zero. The theoretical implications of these results are quite general.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 1 , January 1979 , pp. 41 - 54
Copyright
Copyright © Entomological Society of Canada 1979

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