Cranberry A. Vaccinii and R. Naevana Control, 1975

Small plots (5 ft x 10 ft) were marked off along the edge of a five-year-old planting in western Wood county, Wisconsin. The area was heavily infested with fruitworm and fireworm in previous seasons. Foliar spray treatments were applied on July 3, 1975, several days after the planting had reached peak bloom and repeated on July 10, 17, 24 and August 1. Products tested were diluted on the basis of 300 gallons of water per acre and applied with a one gallon knapsack sprayer. On August 12, 1975, the number of fruitworm damaged berries was counted in each plot. On the same date the plots were rated for fireworm damage. In each of the 3 plots per treatment 3 readings were made to determine the percentage of uprights damaged per square foot. Damage ratings (0-5) were assigned to express the effectiveness of each treatment. A rating of 0 indicates no foliar feeding while a rating of 5 signifies extensive fireworm damage. Pest populations were sufficient to cause economic injury in the untreated plots.