First, the symptoms of endangerment of symptoms of rust disease mainly in the fruit and seedlings on the leaves. 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. 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. 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. Second, the incidence of rust disease is a virus 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 Seedlings are propagated with seeds to avoid root shoots; scioning from diseased trees is strictly prohibited, seedlings are prevented from growing near old orchards, disease-free nurseries are established, and scions are taken from virus-free seedlings. This is fundamental to prevent rust disease. Measures. 2 Strengthen pest control and reduce transmission routes. 4 Avoid mixing apple trees and pear trees. Acid-Base Balance of Medicine,Acid-Base Balance,Calcium Gluconate Injection,Finished Pharmaceutical Product,Acid-Base Balance Agent NOUVASANT GROUP LTD. , https://www.nouvasant.com
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.
3 The management of orchard with good performance in fertilizer management is less severe. Some growers think that more fertilization and more watering can cure the disease. High temperatures can also make the virus passivation symptoms appear lighter. Therefore, many fruit growers are not willing to shave trees and aggravate the disease. Occured and found that the diseased trees must be timely excavated and burned.
Do not treat apple rust as fruit rust
Rust disease, also known as flower face disease, is a kind of virus disease. It is one of the major diseases that harmed apples in recent years. Many farmers have taken the disease as a rust prevention and treatment result, which has aggravated the occurrence of the disease and caused economic losses.