Two species of hard scale — the oystershell scale (Lepidosaphes ulmi L.) and San Jose scale (Quad-raspidiotus perniciosus) also known as Comstock — are infrequently found attacking two-year-old wood of weakened vines.
Hard scale do not produce large amounts of honeydew and are currently of little importance to the B.C. grape industry.
The smaller hard scales (1-2 mm), which are longer than wide, do not produce any cottony material and remain firmly attached to the canes even after death.
