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VIRUSES OF TRICHOPLUSIA NI (LEPIDOPTERA: NOCTUIDAE) AND PIERIS RAPAE (LEPIDOPTERA: PIERIDAE) IN SOIL IN FIELDS OF CRUCIFERS IN SOUTHERN ONTARIO1

Published online by Cambridge University Press:  31 May 2012

R. P. Jaques  and
D. G. Harcourt
R. P. Jaques
Affiliation:
Canada Department of Agriculture
D. G. Harcourt
Affiliation:
Canada Department of Agriculture
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Abstract

In 1968 and 1969 soil samples were collected and bioassayed from 116 fields of crucifers from 14 counties in southern Ontario. Residues of T. ni viruses (nuclear-polyhedrosis (NPV) and granulosis (GV)) were found in soil from 12 counties, being detected in 68 and 45% of soil samples in the respective years. P. rapae granulosis virus (GV) occurred in soil from 7 counties, being found in 18 and 19% of samples. T. ni NPV was more common than T. ni GV. The concentration of viruses of both host species in soil was influenced by density of the host population, crop rotation, soil pH, and month of sampling.

Type
Articles
Information
The Canadian Entomologist , Volume 103 , Issue 9 , September 1971 , pp. 1285 - 1290
Copyright
Copyright © Entomological Society of Canada 1971

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