Answer: What you describe could be a disease or it could be caused by environmental or cultural conditions. On the peach, it could be a fungal disease called scab. The leaves will show an olive-green, almost black coloration. If the leaves are actually black, it is more likely a bacterial blight. Without being able to actually see the affected leaves, I'm only offering an educated guess. For a postitive diagnosis, take a few of the affected leaves to your local cooperative extension office. Helpful folks there can narrow down the causes and suggest control remedies. Contact Dodge County UW Extension, Rm 108 County Admin Bldg, 127 E Oak Street, Juneau, WI 53039-1379, Phone: 920-386-3790.
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