Suppression of Dearness Scale on Cranberry, 1976

In northeastern Monroe County, insecticides were applied to cranberry foliage and vines in 4 large plots (50 x 200 ft) using a hand gun with no. 7 disc, which delivered spray from a 50 gal tank at 150 psi. Three plots were treated at 2 times. The first application (June 9) corresponded with the first observed scale crawler emergence, the second (June 17) with peak emergence. One plot was treated only at peak emergence. A fifth plot was treated through the sprinkler irrigation system (Rainbird 70B impact sprinkler, 3/16 inch nozzle) on June 14 and 24. A stratified random sample was taken of each plot, by the use of 4 transects with 19 points at 10 ft intervals per transect (N = 76). Each random point served as a mid-point for a circular square foot sampling unit. Developing scales were counted in mid-July on vines collected within the square foot area.