Foliar applications may cause leaf burn if applied when temperatures are above 85F. Direct spray to both sides of leaves. The tiny insects usually appear in clusters on ends of shoots and buds. They leave behind a sticky honedew which attracts ants. Spray plants with a strong force of water or use insecticidal soap, or a recommended insecticide to control. They freckle petals and deform flowers.
Damage is far more noticeable on paler colored varieties.
Use Orthene, Malathion or Diazinon to control. Plant container roses anytime except during the heat of the summer. Strip off old leaves from canes prior to pruning to force the bush into dormancy. Prune roses before they leaf out. Remove debris from the area and spray with a dormant oil mixed with a pesticide to control overwintering pests on bushes and soil.