EFFECT OF CERTAIN THIOCYANATE SPRAYS ON FOLIAGE AND FRUIT IN APPLES

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Abstract
In a study extending over a period of 4 summers, soluble thiocyanates. particularly inorganic thiocyanates such as those of Na, K, Ca, and Ba, applied as a spray to apple trees during the growing season, exerted a pronounced physiol. effect on both foliage and fruit. The materials were applied both with a hand-spray and with a power-spray outfit. Cones, varied from 0.05 to 0.5% with 0.1% the one most frequently used. The 1-5 applications were usually applied 10-15 days apart during July, Aug. and early Sept. Good results were usually obtained on fall and winter vars. with 2-4 sprays of 0.1% cone. of NaSCN applied during the latter half of Aug. and early Sept. The trials have included 20 common vars. The leaves are subjected to spray burn and to a chlorotic condition arising from the effect of the chemical on the green coloring matter of the plant; in the fruit the amt. of red color occurring normally tends to be increased and the green ground-color tends to be reduced or replaced by varying shades of yellow and yellow green.

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