The Q&A Archives: Leaf Spot on Indian Hawthorns

Question: I'm losing the battle with leaf spot on my Indian Hawthorns. I spray weekly with Immunox Fungicide with little effect. I also pull off infected leaves religiously, but the next day the plants seem to have just as many infected leaves again. Some of my plants hardly have any leaves left. Is there another product that would be more effective than the Immunox?

Answer: The most common and devastating leaf spot of Indian Hawthorn is known a Entomosporium. It is very difficult to control with sprays.

Your cultural technique of removing infected leaves is a good practice. Keep in mind that most infection occurs in the rainy days of spring and fall, or any other time an extended rainy period occurs. That is when sprays are most critical. Leaves infected at those times later develop the visible spots.

Entomosporium often responds best to a spray schedule of alternating between two different types of fungicides. Your County Extension Office (phone 210-930-3091) can recommend other spray products which may give some control.

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