According to the comparative test results of improved walnut seed base in Mengyin, Shandong Province for many years; In production, Xiangling, Luxiang, Daifeng, Luguo No.4, Luhe 1, Qingxiang and other varieties have strong resistance to walnut black spot. The above varieties can be safely popularized and applied in production. The results of two-year grafted seedlings in this base are shown in the figure.