How to prevent red leaf virus disease
Red plum is also known as purple leaf plum, which is a small deciduous tree. Its leafy reddish purple color is widely used as an ornamental tree in landscaping. In recent years, with the large increase in the use of seedlings and the large number of grafted seedlings, the pests and diseases that damage Hongye Li also aggravate, especially the disease of Hongye Li. The typical external symptoms are: faded leaves become light green or yellow, smaller, shorter between nodes, dwarfing plants, and the discoloration of the top leaves of each plant is particularly noticeable. The external symptoms first appeared in mid-April. At nursery sites, the occurrence of external symptoms of the disease is highly probable, accompanied by a large number of aphids. Once the red-leaf virus disease spreads, not only the ornamental value is greatly reduced, but also the prevention and treatment is very difficult. At present, the prevention and control methods are mainly the following: 1. Strengthen the quarantine of red leaf virus disease. In the quarantine of the country of origin of the nursery stock, it was discovered that the virus-infected strain was removed and burned in time. When the seedlings are transported and quarantined, it is forbidden to bring the virus strains in. 2. Choose to keep non-toxic seedling nursery and vegetative propagation material. The vast majority of red-leaf seedlings are grafted and propagated, so non-toxic shoots must be used to prevent grafting. 3. In addition to treatment of virus-mediated mediators. The mediators of the red-leaf plum virus are mainly locusts, and the most important one is to control the critical moment. In the first half of April, it was better to use Sue to kill Ding 2000 times spray. Laryngoscope Fibre Optic,Medical Bulb Laryngoscope Set,Lightbulb Laryngoscope,Conventional Adult Bulb Laryngoscope Jiangsu Yongle Medical Technology Co., Ltd. , https://www.jsylmedical.com