Control of Noctuid Larvae on Cranberry, 1985

The test was conducted on a 13-year-old section of State Bog in East Wareham, MA. Five treatments were replicated 4 times in randomized blocks composed of 5 × 5-ft plots separated by 2-ft pathways. Applications were made on 24 May at bud swell using a 2-gal, polyethylene compressed air sprayer. All treatments were diluted to the rate of 400 gal of water per acre to approximate conditions achieved commercially with overhead sprinkler systems. After the foliage dried, randomly selected vine uprights in each plot were pruned, placed in plastic bags in a cooler, and brought to the laboratory. Thirty undamaged uprights per plot were inserted into moistened sand within 2, ventilated, 8-oz styrofoam cups. Eleven h post-treatment, 12 field-collected larvae ranging in length from 0.5 to 0.75 in were introduced into each pair of cups. Cups were held at 21°C, 60-85% RH, and 15 h light. After 2.5 days of exposure, cups were inspected for dead larvae. Analysis of variance for unequal sample sizes was used because a replicate mean for Larvin at 1 lb was spurious.