Spring beauty is fleeting, and so is the opportunity to stop scale insects that live on the bark of magnolia trees and suck their sap.
“With scale insects, timing is everything,” said Sharon Yiesla, plant knowledge specialist at The Morton Arboretum in Lisle.
The effects of magnolia scale are usually spotted in summer when it’s the wrong time to treat the tree. “What most people notice first is an ugly black mold on a magnolia tree’s branches in June or July,” Yiesla said. The mold is not harmful in itself, but it grows on the sticky, sweet honeydew excreted by the insects. That makes the mold on a branch a strong indication that you will find scale insects somewhere up above.
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