Do not treat apple rust as a fruit rust
Rust disease, also known as Hualian disease, is a virus disease, and it is one of the major diseases that harmed the apple in Jiaodong in recent years. According to the survey, 50% of the orchards have diseased plants, the rate of individual orchard disease strains reaches 40%, and the critical illness rate is 20%. Many farmers have treated the disease as a rust prevention and treatment result, which has aggravated the occurrence of the disease and caused economic losses. First, the harm symptoms The onset of rust disease is mainly manifested on the fruit and on the leaves of fruit seedlings. There are three types on the fruit: 1. Rust-type: The diseased fruit first appeared in the water-stained discoloration part with a slightly thicker color at the top of the fruit, and gradually expanded into the regular five vertical lines. After that, the water-stained discoloration gradually becomes rust, and along with the growth of the fruit, it spreads along the fruit surface. When it is serious, it can reach the fruit shoulder directly, and is multi-laterally cracked. The development of the fruit is hindered, and the fruit is small and the juice is less, but the taste is less. sweet. The symptoms were most pronounced in Guoguang, Qingban, India, Yanqing, and Jonagold. 2. Flower face type: The fruit has no obvious change before coloring. After the coloration, many yellow-green patches appear on the fruit surface, making the fruit surface become red and green and flower face shape. This type of symptom is more common in Zhuguang, Danding, Beidou, and Red Fuji. There are some white and round patches on the fruit surface when bags are unpacked. These patches are not colored at the end and the fruit surface is red and yellow. Flowery face and white. 3. Rust flower face mixed type: that is, in the same disease fruit showed both rust and flower face symptoms, with red bananas, new red stars, Chi Yang and other mid-maturing varieties perform more. 4. Rust disease also manifests itself in the seedling stages of some species: When Guoguang seedlings grow to 30 to 50 cm in height, the middle and upper leaves of the seedlings are reeled from the base to the back, curling around the midrib, and the sides are curved. Even in the form of a circle, there are no obvious symptoms in the red Fuji fruit seedlings, saplings, and the resulting tree leaves, which are difficult to find in the early stages. Second, the incidence of the law Rust disease is a viral disease. The diseased trees are poisonous and the virus can grow and multiply with the growth of fruit trees. Therefore, once the apple trees become ill, the condition will increase year by year. It is currently known that it can be transmitted by grafting; healthy trees and diseased trees can infect when in contact with each other; they can be spread by scissors and saws when trimmed; Third, control methods 1. Seeds are sown and propagated when seedlings are raised to avoid the use of root seedlings; scionling from diseased trees is strictly prohibited, seedlings are prevented from growing near old orchards, and disease-free nurseries are established to scion from virus-free seedlings. This is the fundamental measure for preventing and treating rust disease. . 2. Strengthen pest control and reduce transmission routes. 3. Good orchard management of orchard symptoms is lighter, some farmers believe that more fertilizer, more water can cure the disease, high temperatures can also make the virus passivation symptoms are lighter, so many farmers are not willing to shave trees, aggravated the disease . The diseased trees must be timely excavated and burned. 4. Avoid mixing apple and pear trees. Cnc Dental Milling Machine,Metal Dental Milling Machine,Dental Crown Milling Machine,Ceramic Dental Milling Machin Shandong Carved Intelligent Technology Group Co.,Ltd , https://www.demetdent.com