Repression of Artogeia rapae (L.) (Lepidoptera: Pieridae) and Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) on Fresh-Market and Processing Cabbage, Using Composite Action Thresholds for Chemical and Biological Control

概要

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Seasonal population fluctuations of the imported cabbage worm Artogeia rapae (L.) and the diamondback moth Plutella xylostella (L.) were studied in southern Quebec (Canada) from 1984-1988, in nontreated check, permethrin and granulosis virus treated cabbage-plots. Timing of permethrin treatment based on an action threshold, equal to 57% of plants infested with larvae of either two species of the caterpillars, produced quality heads corresponding to the standards fro storage or fresh market. This threshold approximate one larva of A. rapae or P. xylostella per plant. A threshold of 87% of infestation (or about 3 larvae of A. rapae and 3.5 larvae of P. xylostella per plant) yielded cabbages marketable for processing. From one to three insecticide treatments a year were required with the 57% threshold, and one to two with the higher threshold. The granulosis virus of A. rapae (ArGV) was very effective to control this pest. The proportion of cabbages marketable for processing was not statistically different between ArGV and weekly permethrin-treated plots. As this virus is ineffective against P. xylostella, for fresh market in which cosmetic standards are more important, a mixture of ArGV and a half dose of permethrin yielded a high marketability crop.
日本応用動物昆虫学会の論文
1995-02-25