Cabbage Looper Control on Lettuce, Orange County, N.Y., 1976

The test was conducted on 'iceburg' lettuce grown in organic muck. Plots were four rows, 40 ft long with four replications in randomized complete blocks. Treatments were applied through a CO2 pressurized knap-sack sprayer equipped with a four row boom and operated at 37 psi delivering 85 gpa through one overhead nozzle/row. Granules were applied through a cone seeder attachment on a Planet-Jr., and placed six inches from the plant base and two inches deep. Foliar applications were on September 10, 16, 21 and 29. Granular side-dress applications were on August 26 for single application, and August 26 and September 24 for double application. Evaluation was at harvest maturity on October 4. Data were taken from the two center rows of each plot. Samples consisted of 15 randomly selected heads/treatment and heads were considered infested if larvae or fresh larval feeding were observed.