1. Brown spot: at the beginning of the disease, there were some gray brown spots on the edge of the leaves, and the growth was irregular. At the later stage of the growth, the spots began to dry up, showing black granular materials. The disease will be spread by wind or precipitation. If it is not treated in time, the damage will be more serious, and it will occur in July to September every year.
2. Blight: this disease will cause the branches to dry up. If infected with this disease, it will dry up from the tip of the stem to the bottom, causing the stem position to change from green to gray white, and there will be black small grains on the surface.
The pests are mainly affected by the cotton spider, which mainly sucks the stems and leaves of plants, resulting in the reduction of water content in the damaged position, causing the stem to dry up, resulting in the damaged position from green to white. Not only do red spiders do harm, they are also vectors of disease transmission, leading to infection with other diseases.
1. Disease: after the disease is found, the diseased branches and leaves can be cut off first and then destroyed to prevent infection of other healthy branches and leaves. Then spray 50% of the dullIn WP 1000 times solution.
2. Insect pest: it can be sprayed with 1500 times solution of 40% dicofol emulsion, and the effect is also good.
