Black Spot

Other Garden Maintenance
The hot, humid weather of late July and early August are ideal growing conditions for black spot fungus. Even though we have been spraying regularly at 1 to 2 week intervals, there is plenty of evidence that black spot lives here, especially on miniatures, and certain susceptible floribundas. I have started to alternate fungicide products, hoping that in may be more effective than using the same fungicide, or fungicide mix for each spraying. There is good news too. Powdery mildew is unusually scarce this summer. Powdery mildew favors cooler, drier growing conditions than we have had.

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