White, circular, and scaly; 1/8 inch in diameter.
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 June 5-10, June 20-25 and in mid August. Treat with a registered insecticide, follow all label instructions and precautions.
Notice: Because pesticide labels can change rapidly, you should read the label directions carefully before buying and using any pesticides. Regardless of the information provided here, you should always follow the latest product label when using any pesticide. If you have any doubt, please contact your local Extension agent or pesticide dealer for the latest information on pesticide label changes.
Disclaimer: Commercial products named on this site are for informational purposes only. Virginia Cooperative Extension does not endorse these products and does not intend discrimination against other products which also may be suitable.
Prepared by Alexandra Spring and Eric Day (Modified from a publication by the USDA)