Boxwood Shrubs

How Soon in the Early Spring Can I Spray Dormant Oil on Scale?

Larrybib added on April 11, 2011 | Answered

It's cool still mid 40's at night and mid 50's as highs during daytime in north/western Frederick County, Maryland. When is the optimum time to spray dormant oil on major infestation of scale on boxwoods and Leuken Laurels?

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Certified GKH Gardening Expert
Answered on April 12, 2011

Eggs are laid in late April and a new batch of this pest hatches in about 3 weeks. This is the time when treatment is most effective. Mature scale bugs wear shields, but the nymphs haven’t had time to develop them.

I would recommend neem oil spray. It is organic, but we have found it to be highly effective against scale and other sucking bugs. Here is more information:

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