One quart of summer oil emulsion per 100 gallons of water will eliminate leaf burn associated with Bordeaux and reduce leaf burn with fixed copper. Experimental data from Northern California suggests this only costs more and doesn't improve efficacy. Thorough coverage of the tree is recommended with special attention to the most affected areas. Spraying each row is necessary once leaf cover develops. It's better than nothing.
Large helicopters give better coverage than small helicopters or fixed wing aircraft.
Stay on your schedule and spray before rain if possible. Spraying after rain gives protection from that point forward, not backward. Now's the time to start planning your codling moth management. Codling moth population size and activity are measured with pheromone traps that monitor male moth flight. All varieties having shown damage in the past and all extremely and moderately susceptible varieties.