Controlling juniper scale
June 8, 2007 - Author: Dave Smitley, Michigan State University Extension, Department of Entomology
Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.
Juniper shrubs can be sprayed for juniper scale in the first two weeks after crawler emergence, which will be sometime in June for most people. Horticultural oils work very well for armored scales like juniper scale when they are applied as a crawler spray. Choose a well known horticultural oil that can be used all summer long. Mix the oil in water at a 2 percent concentration and spray the junipers thoroughly for good coverage. One spray per year should keep juniper scale under control.
Dr. Smitley's work is funded in part by MSU's AgBioResearch.