How to control leaf blight of Sophora flavescens

Sophora flavescens, also known as Sophora japonica root, is a perennial semi-woody plant of Leguminosae, medicinal rhizome, which has the effect of clearing heat, dryness and dampness, diuresis, expelling wind and killing insects. It was originally wild in all parts of the country, with more production in Shanxi, Hubei, Henan, Hebei and Xinjiang. Like warm and humid environment, cold-resistant, can survive the winter in the field. Ditch side, roadside, forest and wilderness can grow, and sandy or semi-sandy soil grows well. Because of its remarkable efficacy and no side effects, it is used more and more, while wild resources are being dug less and less. Sophora flavescens can be planted in spring and summer in the same way as beans.

Physiological characteristics

Sophora flavescens, its root is long cylindrical, the lower part is often branched, long 10~750px, diameter 1~162.5px. The surface is grayish brown or brown, with longitudinal wrinkles and horizontal long lenticels, the outer skin is thin, multi-ruptured, easy to peel off, and the peeling place is yellow and smooth. The section is hard, not easy to break, the section is fibrous; the section is 3-6mm thick; the section is yellow-white, with radial texture and fissures, and some of the heteromorphic vascular bundles are concentric or scattered irregularly. Soil requirements are not strict, generally sandy soil and clay soil can grow, for deep-rooted plants, we should choose the land with low groundwater level and good drainage. Most of the seedlings sown in that year did not blossom, the leaves yellowed and fell off into dormancy in winter, returned to green and grew again in the next spring, blossomed in June, and the fruit matured from July to mid-August. Born in sand or sunny hillside grass and by stream ditches.

How to prevent and cure leaf blight of Sophora flavescens?

Harmful symptoms of leaf blight of Sophora flavescens

The disease mainly harms the leaves of Sophora flavescens. The lower leaves of the plant first fell ill and gradually spread upward. At the initial stage of the disease, brown and round spots appeared on the leaf surface; after that, the disease spots continued to expand, and the center was grayish brown. Finally, the leaves scorched and the plants died, which seriously affected the yield of Sophora flavescens.

II. Prevention and control measures

1. Choose robust seeds and soak the seeds in 1-100 Bordeaux solution for 10 minutes before sowing.

2. Increase the application of phosphorus and potassium fertilizer to enhance the plant resistance to end disease, open ditches and drainage in time after rain to reduce the humidity in the field.

3. Chemical control. At the initial stage of the disease, 50% carbendazim 600 times, 65% Dyson zinc 600 times or 50% Dyson zinc 500 times were sprayed for 2 times 3 times at intervals of 10 to 15 days.