Knowledgebase

Scale on magnolia bush #852391

Asked October 06, 2023, 1:31 PM EDT

magnolia bush, 15-20 years old, noticed bad infestation of scale in mid-September. What is best treatment option?

Ramsey County Minnesota

Expert Response

Hi Duane,

Scale has been a big problrm this year for magnolia trees.

https://extension.umn.edu/yard-and-garden-insects/scale-insects#:~:text=Pesticide%20treatments%20should%20be%20made,systemic%20insecticide%20in%20the%20spring.

https://extension.psu.edu/magnolia-scale

I would spray (thoroughly) with an horticulture oil to smoother them. You can buy it quite easily.

Sally Granath

St. Louis County MG

An Ask Extension Expert Replied October 12, 2023, 7:46 AM EDT

Loading ...