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Magnolia twig infestation #838425

Asked June 30, 2023, 12:44 PM EDT

I have a mature Merrill Magnolia that has oval whiteish colored fuzzy masses on the underside of stems. They are spaced about 6” apart along the entire length and all over the tree. No other apparent damage visible yet. What is this and what is the treatment. I can upload a photo Thank you

Hennepin County Minnesota

Expert Response

Hi Joan ,

You have have mealybugs on your tree.

https://hort.extension.wisc.edu/articles/mealybugs/

I would spray your tree with horticulture oil. You want to get on top of this before they get out of control.

Sally Granath

MG St. Louis County

An Ask Extension Expert Replied July 05, 2023, 8:54 PM EDT

Sorry, I meant to include this link also;

https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/insects/mealybugs/mealybugs-outdoors#:~:text=Depending%20on%20host%20plant%20size,spray%20and%20repeat%20as%20necessary.

An Ask Extension Expert Replied July 05, 2023, 8:55 PM EDT

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