Knowledgebase
Scale drench effect? #727331
Asked September 27, 2020, 7:51 PM EDT
Found several leaves with white fuzzy black entities after the imidacloprid drench. Is this good, bad, indifferent, or wait-til-spring inconclusive?
Oakland County Michigan
Expert Response
Hello,
Please tell me what plant this leaf is from, and why you applied the soil drench. That is, what insect were you trying to control on this plant?
Please tell me what plant this leaf is from, and why you applied the soil drench. That is, what insect were you trying to control on this plant?
These may be wooly aphids.
Thank you
Thank you
Leaf is from a saucer magnolia, trying to control the magnolia scale that had been dripping on our hostas that are under the tree.
Thank you. These do appear to be wooly aphids, and they were likely killed by the soil drench, depending on how long the drench has been in place. It takes several weeks for the plant to absorb the insecticide up into living leaves.
Yes,wait until next spring and spot check the new leaf undersides. Another soil drench may be needed to completely control scale insects that feed on the twigs and branches. I see you have been provided with information on magnolia scale.
Regards,
Laura
Laura
