1. Symptoms: the disease mainly damages the leaves of trees. When the disease occurs, there will be small round spots on the leaves, the color is grayish brown, and the edge color is slightly dark. In the later stage, the disease spots gradually expanded and fused together, causing the leaves to wither.
2. Control method: remove the diseased leaves in time and destroy them. Chlorothalonil or carbendazim should be used to spray leaves in the early stage of the disease. Spray once every 10 days, 3-4 times in a row can cure.
1. Symptoms: mainly harmful to the roots and stems of plants. When the disease occurs, the affected rhizome will produce water stains. The center of the lesion is slightly depressed and the edge is obvious. In the later stage, the surface of rhizome was covered with white silky hyphae and spread to the soil surface. If it is serious, it will cause the whole plant to die.
2. Control method: before planting, use formalin to irrigate the soil and disinfect the soil. In the season of frequent occurrence of the disease, the root can be irrigated with thiophanate methyl solution to prevent the occurrence of the disease. In the early stage of the disease, lime powder can be sprinkled around the basin soil for treatment. Sprinkle once every 15 days, 2-3 times in a row.
1. Symptoms: mostly under the condition of poor ventilation and light transmittance. They will live on the leaves and suck the juice. The damaged leaves will turn yellow or even wither.
2. Control method: when the insect damage is relatively light, the living insect body can be wiped off with a wet cloth. When the disease is serious, it needs to be treated by spraying chlorpyrine or quick killing cream.
