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Fungicide Control Studies on Trees

Leaf Spot on Black Oak During the fall of 1976, we tagged 33 trees of black oak (Quercus velutina) that exhibited leaf spot (Actinopelte dryina), a disease for which there is difference in susceptibility from tree-totree, and from one season to another. In the spring of 1977 we used the KWH sprayer to apply sprays to a height of about 18-20 feet on one half of each tree while the other half remained as unsprayed check. Sprays were applied 5 times at 10-day intervals starting as buds broke dormancy on April 29. Chemicals used were Daconil 2787-6F at 1 Vi, 3, and 6 pints and Manzate 200 at 1 Vi, 3, and 6 pounds per 100 gallons of water. The high rates were used in an attempt to satisfy EPA regulations for labeling chemicals for disease control. Both Daconil and Manzate at the standard rate of 1V4 pints and pounds, respectively, and Kocide (copper hydroxide) were also applied just once, as the first spray when dormancy was breaking.