A mature Concord vineyard of 15 acres with a known history of GBM infestation was used for insecticide evaluations. The vineyard rows were 9 ft apart and the vines set at 8 ft apart within the row. Each treatment consisted of 45 vines (3 rows × 15 vines) and was replicated 4 times in a randomized complete block design. Insecticides were applied as foliar sprays with a hooded boom over-the-row sprayer operated at 500 psi, and equipped with 7 nozzles/boom on each side with No. 2-1/2 (mm) discs and 3-hole whirl plates. From 2 to 6 applications were made between 21 Jun and 11 Aug. The conventional 3-spray regimen for control of GBM, comprising treatments of postbloom, 10 d postbloom, and early Aug, was evaluated and contrasted with alternative application timings. Cover sprays consisting of a tank mix of triademefon (Bayleton) at 1 oz. AI and maneb (Dithane M-22) at 1.5 lb Al/acre were applied to all plots on 15 Jun and 7 Jul to suppress powdery mildew, black rot, and downy mildew. Injury assessment was made on 6 Sep and was based on the number of berries injured by GBM larvae per 100 clusters in each replication (10 clusters from 10 vines/replication). Carbaryl SOS applied at 2 lb AI and Parathion 8EC applied at 9 oz AI were the standards. GBM infestation in the block was considered average or slightly above average in 1988. The threshold for GBM damage is 2% damaged berries.

A mature Concord’ vineyard of 15 acres size with a known history of GBM infestation, located in Fredonia, NY, was used for the evaluations. The vineyard rows were 9 ft apart and the vines set at 8 ft apart within the row. Seven different non-conventional insecticides were tested along with 3 conventional insecticides. Each treatment consisted of 45 vines (3 rows X 15 vines) and was replicated 3 times in a randomized complete block design. Treatments were applied as dilute (100 gal/acre) foliar sprays with a hooded boom over-the-row sprayer operated at 400 psi. Two to 6 sprays were made (per treatment) between 15 Jun (Bloom) and 16 Aug 1990. Injury assessments were made on 5-6 Sep 1990, on the number of berries injured by GBM larvae per 100 clusters in each replication (10 clusters from 10 vines per replication). Sevin 50 WP (two sprays) applied at 4 lb product and Penncap-m (two sprays) applied at 4 pt product were the standards. Cover sprays, consisting of a tank mix of triademefon (Bayleton) at 1 oz AI/A and maneb (Dithane M-22) at 1.5 lb AI/A, were applied to all plots on 15 Jun and 7 Jul to suppress powdery mildew, black rot, and downy mildew. Injury assessment was made on 5-6 Sep based on the number of berries injured by GBM larvae per 100 clusters in each replication (10 clusters from 10 vines per replication).

An established vineyard of Concord grapes comprising 12 acres was used for insecticide evaluation. Rows were 9 ft apart and vines 8 ft apart within the row. Each treatment was replicated 4 x in a completely randomized block design. Each replication consisted of ca 45 vines (3 rows x 15 vines per row). Insecticide applications were made as foliar sprays on 15 Jun, 26 Jun, and 20 Aug, with the exception of Danitol which was applied 4 times—14 Jun, 26 Jun, 7 Aug, and 21 Aug. All plots were treated with triademefon (Bayleton) at 1 oz AI/A to control powdery mildew. Commercial application conditions were used. Materials were applied with a hooded boom over the row sprayer operated at 500 psi, equipped with 7 nozzles per boom on each side with No. 2% (mm) discs and 3-hole whirl plates. Spray volumes are noted on the table. Counts made on 12 Sep 1985 were based on number of berries injured by GBM larvae in 100 clusters from each replication. Ten clusters were sampled from throughout the canopy of 10 vines per plot. Carbaryl 50WP, 2 lb AI/A, and parathion 15WP, 1.5 lb AI/A, were standards.