Basic information of walnut felting disease

It mainly harms Juglans mandshurica leaves. At the beginning of the disease, the leaves of Juglans mandshurica were scattered or clustered with small light-colored spots, the size was about 1mm, and then the spots gradually expanded to 4 ~ 13× 3 ~ 10 (mm), and the color of the spots gradually became darker, mostly round to irregular, scabbed-shaped, and yellowish brown appeared on the back of the leaves. Hebei, Liaoning and Jilin are all distributed.