Females give birth to crawlers during late August to September. Magnolia scale crawlers are typically active around 2,075—3,247 (2,746 peak) GDD50 and tuliptree scale crawlers between 2,016—3,212 ...

There is another window to treat for magnolia scale in late August, when the eggs hatch as crawlers. At that time, use horticultural soap or a summer-weight oil. Even if you applied dormant oil in ...