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Diagnosing Gummosis on a Dwarf Peach Tree in New Jersey

Sap oozing from fruit and trunk indicates gummosis (fungal canker, Botryosphaeria). Symptoms: blisters on young bark, sunken cankers, gum balls. No chemical cure. Keep tree vigorous—water stress worsens it. Prune out dead wood in winter; destroy debris. Summer pruning: remove and destroy all cuttings. Captan for scab helps where gummosis exists. Cytospora or bacterial canker also ooze sap—if confirmed, remove tree.

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