White, circular, and scaly; 1/8 inch in diameter.
Common Host Plant(s)
Blackberry, raspberry, and dewberry.
Incrusts bark at base of canes; weakens or kills canes by feeding on sap.
Throughout United States.
Prune out and destroy all heavily infested canes. Keep down weeds in the planting.
Dormant oil or horticultural oil. Apply in late spring before leaves open. Spray when temperature is above 50°F and freezing will not occur within 24 hours. Dormant spraying with liquid lime sulfur may also give some control.
Insecticide must be applied during the crawler (the mobile, unprotected young of adult scale insects) stage or when crawlers have just settled. The crawler date for rose scale is late May to June 30. Make insecticide applications on June 5-10, June 20-25, and in mid August. Treat with a registered insecticide, follow all label instructions and precautions.
Virginia Cooperative Extension materials are available for public use, reprint, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.
Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; M. Ray McKinnie, Administrator, 1890 Extension Program, Virginia State University, Petersburg.
April 25, 2011