Nantucket Pine Tip Moth Control by Furadan Soil Treatment, 1983

A randomized block experiment, with four replications, was conducted on 64 Monterey pine Christmas trees in El Cajon, Calif. Most trees had a lower trunk diameter of ca. 3 in.; planting was on 5-ft centers. Soil type was Ramona sandy loam. Irrigation was by automatic overhead sprinklers that applied the equivalent of 1.5 in. of water every 10 days. In previous years tip moth in this block of trees had been kept under good insecticidal control. Each treated two-tree replicate was separated from others by at least one untreated row of trees. Treatments were applied on 21 Apr. by walking around each two-tree replicate-at least five times-until the container with a measured amount of insecticide was empty. Granulars were applied by shaking a 1-qt wide-mouth glass jar with many holes in lid. Flowables were diluted in 1 gal of water and applied with a sprinkling can. On dates indicated tip moth injury was evaluated by counting, beginning at tree top, 100 growth terminals on each of two sides of each tree. Data were subjected to log (x + 1) transformations and then to analyses of variance. Shaping of trees by shearing occurred between 18 Aug. and 22 Sep.