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Ninebark Shrubs

Q.I Sprayed My Ninebark With Propiconizol Fungicide And 8 Days Later The Leaves Started To Curl Up And Die. What Happened And Are My

Zone 49525 | Anonymous added on August 1, 2023 | Answered

shrubs now dead? The weather was 82 degrees and humid. They were sprayed in the morning and had been pruned 4 days prior. We were treating for powdery mildew.

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Certified GKH Gardening Expert
Answered on August 3, 2023

If it was very early morning the spray shouldn't have burned the leaves. But if it was later in the morning when the sun had been shining, there could have been some damage. Were all the instructions followed on the application of the fungicide as to how much and when?

When leaves curl up, the plant is under stress. Although ninebarks don't need much pruning, I wouldn't think that caused the leaves to curl up and die. It seems to be related to the fungicide application. Fungicides are better at preventing a problem than curing it and are typically applied in cooler weather.

If the stems are dead (you can scrape off some of the stem and if it is green underneath, they are still alive), you can cut those back to the ground. If they are alive, let the leaves drop off and remove them from the ground and discard them in trash. Then during late winter, cut the stems back to about 1 foot from the ground.

Hopefully, it will releaf in the spring, if not sooner.



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