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1936 Potato Psyllid acre adult Agronomist Agronomy Farm anuary aphids application of lime-sulphur Asst average blooming period blooming stage bushel cents per acre certiﬁed seed color Colorado cost of spraying damage disease or trouble dry-land fields early planted ﬁelds Field number ﬁelds tested ﬁgure ﬁrst grades ground cherries host plants I8 cents Increase in saleable infested with psyllids insect irrigated fields large number late planted ﬁelds lime-sulphur spray means sprayed Net return Ph.D plant symptoms plats sprayed potato ﬁelds potato or tomato potato plant Potato Psyllid Control produced psyllid infestation psyllid nymphs psyllid symptoms psyllid troubles psyllid yellows reported saleable potatoes season of 1935 seed potatoes set of tubers small tubers Solanacea spray applied sprayer stage of growth stolon symptoms of psyllid table stock test ﬁelds Total yield tuber is formed tubers from infested tubers harvested unsprayed plats vine symptoms year’s yield and quality yield of saleable