Accumulation and persistence of a nuclear polyhedrosis virus of the cabbage looper in the field |
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Authors: | EDavid Thomas Charles F Reichelderfer Arthur M Heimpel |
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Institution: | Department of Entomology, University of Maryland, College Park, Maryland 20742 USA |
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Abstract: | A nuclear polyhedrosis virus of the cabbage looper, Trichoplusia ni, was applied to foliage of Fall-planted broccoli and cabbage plants. Soil bioassays demonstrated that appreciable quantities of active virus accumulated in the upper 1 cm of the soil of plots sprayed with 10, 20, and 100 larval equivalents (LE)/acre as well as in unsprayed plots. After completion of the spray program, soil from plots treated with 8 foliar applications of 10 LE/acre contained only slightly more virus than the soil from unsprayed plots, but considerably more virus accumulated in plots treated with 20 and 100 LE/acre. The accumulation of virus continued after the completion of spraying and considerable quantities of active virus persisted through the winter. |
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