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Master Gardener’s Corner: Peach Leaf Curl

Gerry Hernandez | ghernandez@ucanr.edu

Does your peach or nectarine trees look like someone threw hot oil on it and the leaves blistered? You have peach leaf curl.

Peach leaf curl is a fungal disease that affects only peach and nectarine trees. Distorted, reddened foliage in the spring is a distinctive symptom. If the infection continues untreated for several years, the tree will decline. Treatment in spring, after symptoms appear, won’t be effective. It’s not too late to spray for peach leaf curl.

Treat trees with a fungicide in late fall and winter.

â–  Treat just after leaves have fallen in late November or December.

â–  Give a second application in late winter, especially during wet winters.

■ Don’t apply fungicides during the growing season.

■ A rule of thumb is to apply fungicides at Thanksgiving, Christmas, and Valentine’s Day.

Look for symptoms in spring:

â–  New leaves redden and pucker

â–  A second set of normal laves will replace fallen leaves, and the tree will appear normal.

Choose effective fungicides:

â–  The safest effective products available for backyard trees are copper soap (copper octanoate) or fixed copper fungicide (copper ammonium).

■  Apply these with a horticultural oil.

Yes, my tree has peach leaf curl. I only sprayed once in the winter. When we have wet winters 2 to 3 sprays are recommended.

For more information on peach leaf curl, visit ipm.ucdavis.edu.

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UCCE Colusa County Master Gardenershttp://cecolusa.ucanr.edu/Master_Gardeners/
The Master Gardeners of Colusa County can be contacted by: - Email us at glhernandez@ucanr.edu - Call us at 530-458-0570 - Visit us at our plant clinics, farmers markets, Colusa County Fair and at other county events - Visit us at our office, 100 Sunrise Blvd., Ste. E, Colusa, Ca 95932, our office hours are, Tuesdays 9am to 12:00 and 1pm to 4:00

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