When should I treat for scale insects?
Dormant oil in late winter, or a systemic timed to the crawler stage — timing is everything with scale and a spray at the wrong week does nothing.
Why timing decides it
Rarely kills an established tree but weakens it and makes a mess. Heavy infestations need two seasons to clear.
Indiana specifics
Magnolia scale is the one people call about here.
Related
- How do I know if my tree has scale insects?→
- Can a tree with scale insects be saved?→
- Is scale insects a problem in Indiana?→
- What does treatment for scale insects cost?→
- Does scale insects spread to other trees?→
- How do I know if my tree has emerald ash borer?→
- Can a tree with emerald ash borer be saved?→
- Is emerald ash borer a problem in Indiana?→