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 you’ve decided to use this particular method of treatment (see Powdery Mildew on Lilacs). Yes, it really does work. I tried it last summer, using a 2% solution, and had no problems with powdery mildew. Start by spraying any interior leaves, moving to the lower leaves on the outside, and finally spraying the upper leaves on the outside to ensure that none of the oil mixture drips on you during application. Make sure the temperature is not going to exceed 85°F and that no rain is forecast for 24 hours.

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