Viral disease, also known as cramping disease, is the main disease on celery. The disease begins from the seedling stage, and the leaves show thick, light green mottled or yellow plaques at the beginning of the leaves. They show obvious yellow spotted leaves, then become brown necrotic spots, and there may also be obvious yellow or pale green ring-shaped radial lesions. In severe cases, the heart leaf is distorted or the whole plant leaves are not long, yellow, dwarf, the petiole is twisted, the whole plant is dwarfed, and even died. This disease can occur in the whole growth period of celery, and it is seriously affected by the seedling stage. It can be transmitted by mites, and it can also be transmitted through contact during manual operation. Poor cultivation conditions, extensive management, drought and lack of fertilizer, water, and aphids are more serious. The virus mainly winters on protected celery and other perennial hosts.
Virus disease prevention and control methods: 1 strengthen cultivation management. The celery is susceptible to disease during seedling stage. It is the key to prevention and control of seedling prevention. It is necessary to take measures to reduce the temperature of the seedbed, reduce the light, rationally irrigate the water, eliminate the diseased seedlings, and cultivate strong seedlings. Drought prevention, flood control, timely watering and fertilization, promote plant robust growth and improve disease resistance. 2 treatment of disease prevention. Pay attention to the timely control of aphids throughout the growing season. 3 In the early stage of the disease, spray the fungicide No. 1 200-300 times solution or 20% virus A wettable powder 500 times solution.
Lens Ring,Lens Ring Joint Gasket ,Lens Gasket,Lens Ring Gasket
WENZHOU JINGWEI SEAL TECHNOLOGY CO., LTD , https://www.ringjoint-gasket.com