| Insect | Chemical and Formulation | Rate | Remarks |
| Grape root borer (GRB) | Isomate-GRB Lorsban 4E |
100 dispensers/A 4.5 pt/100 gal |
Good weed control usually
prevents GRB populations from reaching high levels. In problem infestations, consider soil mounding, 8-12 inches high, around July 1. Pull down mound before following season. Also consider soil treatment with Lorsban. If GRB is a problem, apply in mid-late July, close to peak egglaying and hatch, but not within 35 days before harvest. Apply 2.0 qt of diluted spray mixture (4.5 pt/100gal) to soil surface on a 15 ft sq area around base of each vine. No more than once/ season. Do not allow to contact fruit or foliage. A mating disruption product, Isomate GRB, is now registered. The label is available (Great Lakes IPM), as is the SDS (Pacific Biocontrol). Apply pheromone dispenser at 100/A, at the beginning of flight, around the first of July. |
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Web Site Author: Douglas G. Pfeiffer