Wisteria, Japanese
Symptom Cause  
Leaves wrinkled or curled; discolored, stunted, tend to fall off
Leaves mottled; distorted
Mosaic Viruses
Vine fails to flower
Plant Too Young
Leaves covered with white powdery substance
Powdery Mildew
Leaves skeletonized
Rose Chafers
Leaves and branches encrusted with small bumps; stunted plant growth
Scale Insects