Answer: Without actually seeing the symptoms, it's difficult for me to diagnose the problem. It could be nectarine pox. Nectarine pox is a widespread disorder. The symptoms initially are observed about 40 days after bloom as a pale white or light-colored circular spot. The area can be a raised protuberance or wart, and are sometimes clustered together into an irregular, rough outgrowth. This has also been confused with scab, spot or other diseases.
Nectarine pox may be a nutritional or hormonal imbalance, such as excessive levels of nitrogen, potassium or magnesium and can result in reduced yields.
Why not take a sample of affected leaves to your local cooperative extension office or nursery professional for a positive diagnosis and suggested control measures?
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