First, the symptoms occur Apple tree rot disease mainly affects the trunk and main branches of the resulting tree, and also harms the branchlets, young shoots, and fruits. According to the symptoms of branches are divided into two types of ulcers and branches. 1, ulcer type: mainly occurs in the trunk, the main branch, diseased bark reddish-brown water-like micro-uplift round to oblong lesions, the disease is soft, easily torn, hand depression, outflow yellow Brown juice, with a heavier distiller's grain smell. In the latter part of the disease, the water was dried and shrunk, cracks occurred on the edges, and black spots appeared on the surface of the lesion. When wet, small dark spots can blew yellow-brown tendrils. 2. Branching type: It mainly occurs on branches aged 2-5 years. The edges of the lesions are not clear, they are not raised, and they are not water-stained. The infected branches quickly lose water and dry, and many small black spots appear on the surface of the lesions at the later stage. In severe cases it also harms the fruit, the lesions are nearly round or irregular, light brown rot, and distilleries. Second, the incidence of the law There are two peak periods of the disease in the year, which are in March-April and July-September. In early spring, the temperature rises, sap begins to flow, nutrients shift to the growing point, the tree branches have less nutrients, and the temperature of the tree surface increases to the sun's surface. This results in unbalanced nutrition and reduced disease resistance of the tree, which is conducive to the spread of lesions. Thus formed the peak of spring incidence. Then, the lesions expand rapidly and cause serious damage, often resulting in dead branches and dead trees. From May to June, the trees were prosperous and the nutrition began to accumulate in the branches. The disease resistance of the trees increased, and the lesions stopped expanding. From July to September, the fruit quickly expanded and needed a lot of nutrients, which led to the decrease of nutrients in the branches of the tree, and the spread of lesions began to spread again, and then the autumn peak appeared. The imbalance of tree nutrients, excessive amount of results, excessive wounds, severe frost damage, lack of fertilizer, drought, early defoliation, and large leaf blasts often lead to heavier rot disease. Third, prevention and control measures 1. Strengthen cultivation management (1) Increase organic fertilizer, phosphate fertilizer, and potash fertilizer, and perform balanced fertilization. (2) Do a good job of thinning and thinning fruit, control the amount of fruit to be fruited, and prevent the occurrence of years of age. (3) Spring irrigation and autumnal control, reasonable irrigation: Minimize and protect various wounds, and cut kerfs should be timely protected with 843 healing agent. (4) Strengthen pest control to avoid early defoliation. (5) After falling leaves in the early winter, dry with a whitening agent made of quick lime, lime sulfur, salt, animal oil, and clean water. (6) Cut out diseased branches in time, scrape off sick spots such as lesions and old skins, and bring them to the park for destruction. 2, timely treatment of lesions (1) mud. Take clay and add appropriate amount of water and slime. Apply 3-5 cm thick to the lesions. The mud layer should be 4-5 cm beyond the outer edge of the lesion, and then be tightly packed with a plastic cloth. (2) cutting treatment. Use a knife to draw a circle 1 cm away from the edge of the lesion. The knife reaches deep into the xylem and cuts several depths of the xylem in the lesion. Then apply 21% peracetic acid to the surface 2-5 times. Liquid, etc., smear edge should be 3 cm beyond the outer edge of the lesion. Apply 1 time after 1 month. (3) curettage. Sharply remove the lesion with a sharp knife, reach deep into the xylem, and scrape 0.5-1 cm of healthy bark on the edge of the lesion. Then apply it with 30-50 times liquid of 5% bacteriostatic water solution. This disease is prone to recurrence. Summer and fall seasons should be checked and treated in time. Lactobacillus Paracasei,Lactobacillus Paracasei Powder,Lactobacillus Paracasei Probiotic,Lactobacillus Paracasei Supplements Jiangsu Biodep Biotechnology Co. ,Ltd. , https://www.mbioda.com
Apple tree rot disease, commonly known as rotten skin disease and stink bug, is one of the most important diseases of apple trees. The disease mainly damages the result tree, resulting in weakened tree vigor, dead branches and dead trees. When the disease is severe, the tree is destroyed and the garden is destroyed.