Control Aphids and Leafhoppers that spread this virus. Lace Bugs . Use Malathion or Sevin when damage is first noticed and also spray the undersides of the leaves. Leaves have white, round spots that coalesce and form bleached areas giving a variegated appearance. Apply Diazinon or Malathion when damage or insects are noticed.
Pale spots appear on the uppersides and rusty blister-like spots on the undersides of the leaves.
Apply Garden Sulphur or Rose Dust at weekly intervals during wet and humid periods. First yellow, then brown and black spots increase in size on the leaves. Lower leaves are affected first. Leaves wither and die but remain hanging on the plant. Pick off and destroy infected leaves.