Black spot mainly damages stem and leaf. In the early stage, there will be dark brown spots on the leaves, and remediation will spread to form spots. With the expansion and increase of spots, the whole leaves will die. The disease can spread to the stem, causing the plant to fall.
Clean the diseased leaves in time and keep the basin soil clean. Remove the leaf spots in time to avoid spreading. spray the agent in time when the disease occurs, and select the zincic solution of Daisen. Spray both sides of the leaf.
The root and stem of the plant will turn black brown, some leaves on the ground will wither slowly, the plant will fall, and the whole plant will die in serious cases.
If it is found that the base of the plant is rotten, it shall be pulled out and destroyed in time. replace with new soil and basin, and disinfect them before use. pay attention to sanitation when applying fertilizer and watering, and avoid using unripe fertilizer and polluted water to irrigate plants. spray the agent in time when the disease occurs, and spray the Triadimefon carbendazim wet powder 1000 times liquid, or 56% fenshan dispersible granule 1000 times liquid for 4 to 5 times continuously, with the former dense and the latter sparse.
Because of the lack of nutrients, environmental discomfort, fungal infection and other reasons, the leaves of plants turn yellow.
Cut off the yellowing leaves. If the yellowing is serious, remove the plant. when propagating (sowing, cutting), healthy plants should be selected as mother plants. control insect pests, which can form wounds on leaves and may infect bacteria.
The whole plant is diseased, the leaves are patterned, the plants grow poorly, the flowers are small and few, and the petals are spotted and deformed.
The latent ability of mosaic virus is relatively strong. It can live on the plant for winter, and it will come on in spring. Therefore, prevention should be done well. Spray fungicides before winter. remove weeds and dead leaves in time to reduce the source of infection.
