Also see Mites above. No cure for domestic purposes. Destroy infested plants and plant new plants in a different location. Leaves curl upward at the edges. Reddened undersides are covered in whitish powder.
Leaves later turn purple or red.
Pick off and destroy affected leaves. Spray Benomyl or Sulphur . Red-purple spots on leaves. Spots enlarge and show gray centers. Spray Fruit Guard when spots appear and repeat twice at 14-day intervals.