1. Brown spot: there will be irregular spots in the leaves after the disease. In the later stage, there will be small black mould spots in the center of the spots, which will cause the leaves to wither in advance. In the early stage of the disease, methylthiocarbendazim and lvdebao suspension were sprayed for 2-3 times.
2. Soft rot: the edge of the leaf will be damaged and the pedicel will change color. Pay attention to the protection during harvesting, soak and air dry with formaldehyde 55 solution, and pull out and destroy the diseased plant in time when it is found.
3. Virus disease: this disease can cause two kinds of symptoms, which may cause flowers and leaves, or white spots, partial distortion of leaves and white spots on pedicels. The disease-free plants were selected for planting, and the aphids were controlled by marathon or deltamethrin emulsion in the growth period.
4. Leaf spot: at the beginning, small spots appear on the leaves, and then gradually expand into large spots, which will damage the flowers and pedicels. It can be sprayed with Dili de emulsified oil.
The main pest is Tetranychus bicolor, which will lie on the back of the leaf and suck the juice from the leaf, which will eventually lead to the fall of the leaf. Removing the harmful leaves, spraying dicofol, acaricide, good winter and so on can all have good effect.
