Garden Q&A: What's happening to my crape myrtle's flower buds?

For The Baltimore Sun

This year a lot of my crape myrtle’s flower buds turned white and wouldn’t open. I’ve had this crape myrtle for years and never had the problem. Is it getting old?

Your crape myrtle is infected by powdery mildew. Like many fungi, powdery mildew has had a banner year with our abnormally high rainfall. If you have not had this in the past, it suggests your crape myrtle has good disease resistance. It should be back to its usual self next summer — provided we have a more typical dry summer. Prune off infected flower heads now to reduce the amount of infectious material that could harm your crape myrtle next year. There are many crape myrtle varieties with excellent disease resistance, so any ones that struggle with powdery mildew year after year should be replaced.

I have yellow jacket wasps in my house wall. Every day several fly into the house, but I can't find a hole inside. I don't want to spray poison into their outside entrance, if it is continuous with the interior. My family is afraid of getting stung. Should I have an exterminator come?

Yellow jackets all die when hit with hard freezing temperatures of winter, except for the queen, who leaves and does not return to the hive. However, yellow jackets could stumble into your home for months, if not all winter, because the warmth of your house keeps them alive. Commercial wasp and hornet spray should not harm your family, but the wall’s construction could block the insecticide from reaching the nest effectively. You may need a pest control company. Treat sooner rather than later. The longer the hive population builds, the bigger the resulting mass of dead organic matter, which in turn will attract insects that feed on it.

University of Maryland Extension’s Home and Garden Information Center offers free gardening and pest information at extension.umd.edu/hgic. Click “Ask Maryland’s Gardening Experts” to send questions and photos.

Copyright © 2018, The Baltimore Sun, a Baltimore Sun Media Group publication | Place an Ad
39°