Tag Archives: powdery mildew

Plant of the month: Spiraea japonica ‘Little Princess’

Few shrubs are as spectacular in bloom as established plantings of Spiraea vanhouttei (Bridal Wreath Spirea). Not all of us have room for this magnificent bloomer, but breeders have worked diligently to develop smaller spirea with three-season interest. Two of my … Continue reading

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A Note on Powdery Mildew and Disease Management

“Powdery Mildew on Lilacs” continues to be one of the most read articles on Gardening in the Mud. However, anyone located in Zones 5 and 6 hoping to treat powdery mildew at this time of year has only one control … Continue reading

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Lilac Powdery Mildew Treatment Reminder

If you haven’t started treating your lilacs for powdery mildew, don’t delay. Now is a good time to start with your first horticultural oil spray, with the second spray at the end of July or the beginning of August, if … Continue reading

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Powdery Mildew on Lilac

It’s the time of year when you’re likely to notice the leaves of your lilac shrubs (Syringa) covered in a powdery, white substance known as powdery mildew. Powdery mildew on lilac is a fungus whose causal organism is Microsphaera penicullata. There … Continue reading

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