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100 gallons Agriculture amount aphids apples applied Arsenate 3 lbs arsenate mixture average Bartlett pear brood California canners cent Check Lead Arsenate check trees chee cleaning codling moth codling moth control College of Washington color committee condition cost cover crop cryolite culls deposit dipping tank effective Experiment Station experimental factors fertilizers fish oil fluorine grade growers harvest Horticultural Association hydrochloric acid increase injury irrigation Jonathan Jonathan apples kerosene Lead Arsenate 2-100 machine material maturity method mineral oil moth activity nicotine nitrogen Northwest oleic acid orchard Overley Pacific packing parasites Pateros pear production pear trees phosphorus plots pollen pounds President problem Pullman residue removal rinse Rome Route season seconds immersion soap sodium silicate soil Spokane spray program storage summer oil tandem temperatures tion triethanolamine triethanolamine oleate variety Vatsol vitamin washing solutions Washington State Horticultural water-core Wenat Wenatchee Wenatchee district WHEREAS WINESAP woolly apple aphid worms