A Physiological Response of Potato to Foliar Applications of the Insecticide, Guthion

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Abstract
Use of the phosphate triazine insecticide, Guthion (0,0-dimethyl S-4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethylphosphorodithioate) as a foliar spray for potato insect control has resulted in increased yields of red-skinned potatoes above that normally obtained as a result of efficient insect and disease control. The magnitude of this increase averaged about 15% and was solely attributable to increases in set of tubers. Dry matter and potato grade based on size was not affected. While tuber set of white-skinned potatoes was also increased slightly, results were not significant, and yields were less than those obtained from other plots treated with insecticides.