1. Mosaic: it is caused by virus infection. The leaves show wavy lines or chlorotic spots, which have an impact on the growth. In serious cases, it causes plant dwarfing. Select the plants with good disease resistance to plant, eliminate the vector of insect pest transmission in the growth period, spray aminooligosaccharide water agent in the early stage of disease.
2. Powdery mildew: powdery mildew is easy to occur in the plum rain season, white spots will be produced on the leaves, and then the hyphae will be attached. After the onset of the disease, cut off the part of the disease in time, and then focus on burning, so as to prevent the spread of the disease. Spray the mixture 500 times and wipe it with cotton ball dipped in alcohol.
3. Black spot: this disease damages the leaves and pedicels. At first, there are small purple and black spots, then they expand into large round spots, and connect with the later spots. After the onset of the disease, it can be sprayed with Bordeaux solution, which has a good prevention and control effect.
1. Stem bee: it mainly damages the stem, leading to the broken and withered branches and seriously affecting the growth. Select insect resistant varieties and spray them with chrysanthemum oil.
2. Aphid: sucking the juice in the plant, causing the branches and leaves to dry up. In addition to spraying with grass ash and water, special chemicals are also needed.
3. Red spider: there are small yellow brown spots on the leaf surface at the beginning, and then gradually lose green, resulting in a large number of leaves, which can be sprayed with aifuding cream.
