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AN ANALYSIS OF THE NATURAL BIOLOGICAL CONTROL OF TRICHOPLUSIA NI (LEPIDOPTERA: NOCTUIDAE) ON COTTON IN CALIFORNIA

Published online by Cambridge University Press:  31 May 2012

L. E. Ehler  and
R. van den Bosch
L. E. Ehler
Affiliation:
Division of Biological Control, University of California, Berkeley
R. van den Bosch
Affiliation:
Division of Biological Control, University of California, Berkeley
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Abstract

The impact of natural enemies on Trichoplusia ni (Hübner) is reviewed. Disappearance of eggs and small larvae (presumably due to predation) is consistently the major intrageneration mortality. Parasitoids and a nuclear polyhedrosis virus effect mortality of larvae surviving early-instar predation. From the analysis, it is argued that natural enemies capable of effective colonization of the habitat and rapid exploitation of the prey population (i.e., r-strategists) are suitable agents for biological control of pests of annual or short-cycle crops. Polyembryony, polyphagy, and polyhedrosis represent attributes which enable the particular natural enemy to implement the rapid-host-exploitation strategy. This interpretation gives added theoretical support for importation of exotic natural enemies of pests of non-perennial crop plants.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 10 , October 1974 , pp. 1067 - 1073
Copyright
Copyright © Entomological Society of Canada 1974

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