Abstract
Abstract Soil around 14-18-yr-old concord grape vines was treated with a full cone spray using 3.8 liter per vine. A swath 0.75 m wide x 1 .0 m long was sprayed on each side of a vine. Plots were 5 consecutive vines located at random within a 2.5 ha vineyard (Gainesville, GA) and a 0.5 ha vineyard (BlairsviIle, GA). Soil within the treated areas was scraped 7 cm deep 7 and 14 days after treatment for bioassay of efficacy to first instar grape root borers. Bioassays used vials (1 cm dia x 4 cm) with young grape roots at the bottom. Treated soil was added to fill 2 cm of the vial. Five freshly hatched grape root borer larvae were placed on the soil surface in each vial. Seven days later soil and roots were removed, examined, and the number dead/iive larvae determined. Each treatment was replicated 3-8 times.
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