Hello –
It sounds to me like your young trees have peach leaf curl. Symptoms appears in spring as reddish areas on developing leaves. These areas become thick and puckered causing leaves to curl and distort. When severe, leaf curl can substantially reduce fruit production.
To treat this fungal disease we recommend the following steps.
1.) Leaf curl can be controlled by applyingย sulfurย orย copper-based fungicidesย that areย labeled for use on peaches andย nectarines. Spray the entire tree after 90% of the leaves have dropped in the fall and again in the early spring, just before the buds open. For best results, treesย should be sprayed to the point of runoff or until they startย dripping.
2.) Containing copper and pyrethrins, Bonideยฎ Garden Dust is a safe, one-step control for many insect attacks and fungal problems. For best results, cover both the tops and undersides of leaves with a thin uniform film or dust. Depending on foliage density, 10 oz will cover 625 sq ft. Repeat applications every 7-10 days, as needed.
3.) Keep the ground beneath the trees raked up and clean, especially during winter months.
4.) Prune and destroy infected plant parts as they appear.
5.) If disease problems are severe, maintain tree health and vigor by cutting back more fruit than normal, watering regularly (avoiding wetting the leaves if possible) and apply anย organic fertilizers high in nitrogen.
Hope it helps!
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