Abstract
Abstract This trial was conducted in a 25-yr-old commercial ‘Catawba’ vineyard near Mountain Grove, MO. The experimental design was completely randomized with 2 replications. Each plot consisted of 3 rows each containing 66 vines. Lorsban 4 E was applied in a 3 ft wide band under the trellis row at the rate of 6.13 qt in 272 gal water/acre on 28 Jul 1987, 23 Jul 1988, and 25 Jul 1989. Because the grape root borer has a 2-year life cycle, evaluation for control of newly hatched larvae entering the soil was made by determining the number of adults emerging from the soil under treated and untreated vines 2 years after treatment. Evaluation consisted of examining the soil surface under all vines in the middle row of each plot for pupal exuviae on 15 Aug 1989, 9 Aug 1990, and 8 Aug 1991, after peak adult emergence had occurred.
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