Answer: I don't think the symptoms you describe point to a virus, but to a problem with the roots. Wilting usually signals over- or under-watering, or soil that's not draining well. It might also be reacting to the pesticide applications you've been providing. Coneflowers thrive in full sunshine in average to dry soils. They need regular, deep watering during the hottest months of summer. Continue to remove spent blooms from your plants and try to nurse them along for the rest of the summer. In the autumn you can cut the plant down to soil level and remove the debris from the garden. Next spring healthy new foliage should emerge from the roots. Good luck with your coneflowers!
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