answersLogoWhite

0

The most effective control for scale on Magnolia trees is probably Dormant Oil, also known as Ultra-fine Horticultural Oil. There are some specific guidelines to spraying Dormant Oil: The temperature should be between 45 and 85 degrees F., humidity under 50%, and no freeze expected within 72 hours. You can only spray the tree once a month, although if you cover it thoroughly, undersides of leaves as well, only one spray is usually necessary. The oil dries quickly and smothers the scale insect.

User Avatar

Wiki User

14y ago

What else can I help you with?