crape myrtle scale follow up #851355

Asked September 26, 2023, 10:30 PM EDT

I have 3 -10 ft. tall crape myrtle trees that are about 18 mos old and I discovered crape myrtle scale as the plants were beginning to bud after it had spread to 30-40% of each bush on the branches. I applied Bonide granules by spraying them on the branches with a hand spreader. My neighbor (and you) told me that it might have been more effective placing the granules in the soil in a circle around the tree. You advised against further applications then assuming that some was absorbed systemically from what fell to the ground below the trees. Indeed two of the trees flowered about 30% of expected and one hardly at all. I know I wasn't supposed to feed them when the plants were blooming to protect the bees due to the pollination that would result. The blossoms are getting ready to drop and I'm trying to plan for my next steps. Please advise.

Henrico County Virginia

Expert Response

Yes, you can apply the imidacloprid this time of the year as the trees are done flowering.  Apply to the granules to the soil per label directions.  You can apply again early next spring as the buds are swelling.  

It may take several years for any black sooty mold that grew on the Crapemyrtle Bark Scale excrement to dry up and flake off.  That is not a concern.
Ed Olsen Replied September 27, 2023, 10:06 AM EDT

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