Pear tree rot disease
Pear rot occurs mainly in the pears of fruit trees above the age of 78. It is the most important branch of pear trees. Infestation and damage to the main branch and the larger lateral branch group mainly occur in the trunk. When the lesion surrounds the entire main branch, the main branch is dead, and when it occurs seriously, it can cause dead trees and destroy the garden. Mustard Products,Dried Mustard Powder,Dry Mustard Powder,Mustard Sauce Paste NINGXIA KOFOLON INTERNATIONAL CO.,LTD. , https://www.kofolon.com
Symptoms On the main branch, the lesion is brown to red-brown at the beginning. Many irregular, and the size changes greatly. With the development of the disease, it can cause the entire cortex to rot, the lesion is slightly sunken, and the lesions are water-stained under wet conditions. More than two years of sick spots on the dense black spots, pathogens for childbirth. When the humidity is high in the spring and autumn, Mei Huang teaches thick sap from the confinement crusher. It is a branching spur angle and spreads in case of rain, causing new infection. Compared to apple rot, the rot stain of the rot cortex is light or absent.
The pathogenic bacteria in the form of ascospora shells, meristems, and mycelium are used to overwinter on diseased tissues, and springs form sub-cockroaches or meristems, which spread by wind and rain and cause new infections. The spring is the fastest period of bacterial infection and lesion expansion, followed by autumn. Due to the weaker pathogenicity of pathogenic bacteria, infestation and reproduction generally occur on the top of the tissue where the growth activity is low or near death. With proper management of water and fertilizer, strong growth momentum, and a well-structured tree, the incidence of disease is light, whereas the incidence is heavier. From the variety, the incidence of white pear and Akiko pear strains is heavy. Sand pear strains are light in the 21st century.
Control methods
1, a reasonable load, strengthen water and fertilizer management. In particular, attention should be paid to the application of organic fertilizers and the balance of nitrogen, phosphorus, potassium, and various trace elements to maintain a good growth potential of the tree.
2, Branch trunk white, prevent frost damage, reduce bacteria from the bottom up.
3, spring and vigorous growth period, timely scraping treatment lesions, scraping after the protection of the coating. The types of pharmaceuticals include chlorpyrifos and decoction. It can also be applied evenly with 7 parts of beans and 3 parts of carbendazim or thiophanate methyl.