There are no chemical controls for crown gall. Small galls may be pruned out with a sharp knife or pruning shears. Disinfect tools with alcohol or household bleach after each cut. In severe cases, remove the plant and the soil surrounding the roots to prevent the bacteria from spreading. Leaves or mottled or streaked with yellow or the develop a pattern of yellow netting.
Plant growth slows.
Mosaic, a virus disease that is often transmitted by aphics and other insects. Although the virus does not affect flowers, it detracts from the overall appearance of the plant. There are no chemical controls or cures. In mild cases, symptoms often disappear by themselves. In severe cases, infected plants should be removed to prevent the virus from spreading.