Answer: Honeysuckle is prone to powdery mildew, especially if there is poor air circulation around the plant and it is not getting at least 8 hours of direct sunshine. Humid weather can also complicate matters. Unfortunately, once a plant contracts powdery mildew, the affected parts will always have it. If your plant is otherwise healthy - has been growing well prior to the attack - I'd prune away the affected plant parts (to stop the spread), spray the remaining plant parts with a fungicide to protect them, then wait for healthy new growth to appear. Pruning will accomplish two things; it will remove the disease spores to keep it from spreading, and it will encourage the production of healthy new stems and foliage. An added bonus is that pruning will open the plant up to better air circulation. Of course, honeysuckles produce flowers on new shoots so pruning should also increase the number of flowers your plant has later in the season.
Best wishes with your honeysuckle!
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