Dor from Keene Nh writes
Bonide Systemic Insect Control is labeled to be used on roses to treat the following insects: Aphids & Grasshoppers Amount to Use: 2 Tbs (1 fl oz) per gallon of water. Japanese Beetles and Elm Leaf Beetle Amount to Use: 4 Tbs (2 fl oz) per gallon of water. Other Listed Insects Commonly Found on Ornamental Plants Amount to Use: 3 Tbs (1 ½ fl oz) per gallon of water. The white residue could be from overspraying or over mixing but should not harm the roses. Be sure to spray entire plant covering both sides of foliage thoroughly. Spray when insects are present or when feeding injury is first noticed. For hard to kill insects, such as flower thrips, gladiolus thrips, mealybugs, scales, two-spotted spider mites, and whiteflies, spray 2 to 3 times, waiting 7 to 10 days between each application. Repeat if re-infestation occurs. Clean sprayer after use by flushing with water.
Answer last updated on: 06/11/2018
