|How do you keep black spots off the grapes?
The Gardener’s Answer
Hi Cynthia: Grapes grown in Kentucky are susceptible to several insect and disease issues. The black spot on your grapes should be positively identified before a treatment plan can be put in place. Specific products are effective and labeled for specific diseases. Do you know which grape you are growing? Some cultivars are more disease resistant than others and, like any other plant, will produce disease-free fruit if given ideal conditions in which to grow. They are quite adaptable to many soil types but will grow best in a nutrient-rich, well-drained soil. Grapes should be planted in full sun with good air circulation. Sanitation is essential in terms of preventing future insect and disease problems. Pruning out diseased canes and removing all fallen plant debris is an important part of the process. You can take a sample of your diseased foliage and/or canes to the agriculture or horticulture agent(s) at your county cooperative extension service. The Todd county offices are located at 202 E. Washington Street. The phone number is (270) 265-5659. They will be able to give you a positive diagnosis and treatment options.