Abstract Sprays of Dipel 3.2W, .56 kg/ha and Thuricide HPC, 7.015 litresAa were applied to one side of each row of trees in two separate 1.6 ha. plots at Massies Mill, VA on June 3, 13, 23 and 27’77. The side of the row sprayed was alternated on each successive spray date. The Golden Delicious trees on MM106 rootstock were 6 years old, well pruned and uniform in size. All experimental materials were applied with a “Swanson” air blast sprayer with 6.5 kg/cm2 pump pressure that delivered 467.68 litres per ha at 3.2 km per hour. The standard 9.6 ha “grower sprayed” block was also treated with the alternate row spraying technique. A “Bean speed sprayer” calibrated to deliver 1870.76 litres per ha was the commercial sprayer unit ;used. Following the application of the four B. thuricide treatments Imidan 50W and Zolone 25W were used to contain the leafroller populations for the remainder of the season. Spray schedules are pre-sented in Table 1. Leafroller larvae found in a three minute search period on each of four trees per plot on June 6, July 7 and 29, and August 10 and 23 were averaged and are presented in Table 2 as larvae per minute of search. There was a slight drop in the number of larvae per minute following the August 9 application of Zolone 50W to the thuricide block but no such decrease followed an August 5 application of Imidan to the Dipel treated plot. On August 23, 5 samples of 100 apples each were taken from each plot and examined for leafroller injury. Data were recorded as percent damaged fruit.