Aphids cause distortion of new growth, deposits of honeydew, and sooty mold. Use malthion or Orthene sprays.
Borers attack flowering cherries.
Keep trees healthy with regular fertilizer applications. Scales of several types infest prunus. Dormant oil is used to control overwintering stages. Sevin, Orthene or malathion controls crawlers when present. Identify the scale for proper timing of crawlers.