The leaves on some of my coneflowers get leathery, dry, and feel a little "gritty." They eventually dry up and fall off. It doesn't look like powdery mildew, and I don't see any insects. Sometimes pulling off the affected leaves helps the plant recover, but often the plant dies. It doesn't affect all of my coneflowers, just some. I regularly use Neem as a fungicide. Does anybody know what this is or what to do about it?
Coneflower leaf problems
If you have more pictures it will be helpful.
anyway if you spray neem at day time - the interaction between neem and direct sun cause leaf burning.
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