This is a very common disease and can cause considerable loss in fibre yield of ramie.

Symptoms:

• Infected leaves develop circular to angular brown spots with narrow red or dark-reddish-brown margins.
• On heavily infested plant, defoliation may occur.
• During heavy infection, the spots may appear uniformly over the foliage, coalesce and damage large areas of leaf tissue.

Size:

size from pinpoints up to 5 cm in diameter with concentric rings.

Climate:

Warm temperature, frequent rain and high humidity are the most important factors for the development of this disease.

Temperature: 20 -280 C Relative Humidity:90-100% .

Causes:

Diseased-seeds and planting materials also play an important role in spread of the disease.