Prevention and control of rot disease of growing peach trees

Peach tree rot is also known as dry blight. After the peach tree is killed, the branches die and ulcer spots are formed in the big branches and trunks. If not treated in time, the whole plant will die soon. The main causes of the disease are: freezing injury and extensive management; improper fertilization and more autumn rain years, the dormancy of peach trees is delayed, which reduces the cold resistance of peach trees. The specific prevention and control methods are as follows:

Strong trees to prevent diseases

① reasonable burden determines the appropriate amount of fruit according to the growth status of the tree and the level of fertilization.

In order to increase the application of fertilizer and water in ②, we should pay attention to the application of organic fertilizer, phosphorus, potassium and trace element fertilizer, but not too much nitrogen fertilizer.

Protecting leaves and promoting early defoliation by ③ is an important reason for weakening tree potential. Diseases and insect pests that cause early defoliation of peach trees should be controlled in time.

Pay attention to tree protection

① avoids frost injury and sun burn, and the temperature difference between day and night is large, so it is easy to suffer frost injury in winter; there is no leaf cover on the sunny side in summer, so it is easy to die from the sun. The effective measures to prevent and control frost injury are: one is to whiten the tree trunk to reduce the temperature difference between day and night, and the other is to bind the tree trunk to prevent frost. The commonly used formula of whitening agent is 12-13 kg of quicklime, 2 kg of stone-sulfur mixture (about 20 Baume), 2 kg of salt and 36 kg of water. White painting can also prevent sunburn of branches.

The saw blade with large wound protected by ② should be flattened and then protected by varnish or topiramate ointment, Smur921 antibacterial agent and so on. After the larger lesion is cured, it should be bridged and protected in time.

Timely treatment of plaque

① scraping bark peach tree rot is generally harmful to the superficial layer of bark, scraping off the warped bark and necrotic tissue before peach tree germination, you can scrape off most of the disease spots, remove most of the germs on the tree, and stimulate the tree to produce callus after scraping to promote the healing of the disease spot. After scraping off the diseased tissue, the disease department is smeared with 70% methyl topiramate wettable powder plus 2.5 parts of vegetable oil, which has a good effect on the cure of plaque, and can also be smeared with Smur921 antibiotic 20ml 30 times solution, 843 rehabilitation agent solution, etc., in order to prevent scar recurrence.

② using RBF Fruit Tree Protective Film to Control RBF Fruit Tree Protective Film (Guokangbao) is a high-tech product developed by Shanxi Fruit Research Institute, and it is the latest special agent to control peach rot in China. It can be smeared on the trunk or sprayed in the full crown, which has the dual functions of sterilization and protection of the tree. According to the efficacy test, the effective rate of curing peach tree rot is 94%, the control incidence rate is less than 5%, and the scar recurrence rate is less than 3%. In addition, the application of medicine solution to treat scars can stimulate the growth of new bark, restore the tree potential as soon as possible, and increase the yield of peach trees.

The control methods are as follows: spraying 150 × 200 times solution (full crown) once respectively before germination and after defoliation in spring, which can effectively control peach tree rot, reduce water evaporation, restrain striping, and improve the ability of cold and drought resistance of peach trees; brushing the trunk of peach trees with 50-60 times liquid in spring (instead of stone-sulfur mixture) can seal and suffocate the overwintering parasite eggs in the gaps between tree trunks and main branches and reduce the occurrence of pests. After scraping and treating the rot of peach trees in spring, smear the scar with 5-10 times solution to promote the healing of the scar.