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Test insecticides were applied to 5-yr-old ‘Riesling’ grapevines planted 2.7 by 2.1 m. A completely randomized experimental design with 8 single-vine replicates was used for evaluation. Applications were made on 15 Jun and 6 and 31 Jul with a hand-held C02 sprayer and a 9505-E-TeeJet nozzle at 45 psi (3.2 kg/cm2). A count of the infested berries was made on 31 Jul. This count evaluated the effectiveness of 2 sprays applied to control the first grape berry moth generation and the beginning of the second generation (based on pheromone trap data). A count of leafhopper-damaged leaves/25 leaves sampled was made on 22 Aug. Ten clusters were weighed on 28 Sept to determine the yield loss caused by larval berry moth feeding.

Insecticide Evaluation for Grape Berry Moth and Grape Leafhopper Control, 1987