Leaf Curl is a fungal disease which overwinters in the crevices of the tree bark and around the buds. For peaches, spraying is best in late winter when buds first swell. You can use either Bravo or Copper. Spray with Bravo thoroughly at the first sign of the disease. Apply it at 10-14 day intervals in wet, humid weather. Remember there is a withholding period with Bravo of one day. Spray with Copper oxychloride thoroughly at bud burst and green tip (Sept), leaf fall (May) and during winter dormancy.
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