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[special note] The disease is mainly hyphae, inner and outer sub-seats and spores in the site of diseased plants or diseased plant residues overwintering. At the same time, there are bacteria on the limbs that have never been affected. The main potential sites are dead spots on the branches and dead skin, saw cuts, insects, and old barks. When the tree grows strong and the resistance of the branches is strong, the latent pathogens do not show morbidity and continue to lurk; when the resistance of the branches decreases, the latent pathogens immediately take the opportunity to cause lesions. The bacteria mainly invade from the wound, but also invade through the lenticels and buds. The time of intrusion is mostly concentrated in late autumn. After germs invade, they will not cause lesions in the past years and they will lurk in the form of rotting spots. The year before and after germination is the weakest period of the tree's resistance throughout the year. The tree vigor is also an important factor affecting the disease. The old tree is weaker than the young tree. In addition, in the winter, it suffered from frost damage. The tree with more insects on the tree body also has more serious diseases.
ã€Control Techniques】 Apple rot disease has taken effective control of latent pathogens, active treatment of lesions, and simultaneous enhancement of fertilizer and water management measures. It has achieved good control effects for the rapid control of disease occurrence and prevention of the continued appearance of new lesions. The specific prevention and control measures are as follows: First, before the time of germination, the rough skin is scraped off and the dead branches are cleared. Immediately after spraying, the whole tree is sprayed with 100 times the "multi-effect destroying rot". No matter the disease-free or disease-free plant, the whole park will spray. . One week later, 50 times more liquid was brushed with a brush to scrub the trunk and the lower part of the backbone, iliac crest, and a large excision site. If there is a lesion in the brushing, knife cuts can be used as a 0.5 cm blade to apply the drug. After another week, apply it a second time. This is called "spraying the second largest cure." If the orchard is severely diseased, the orchard will be treated for the first year and the second year will be treated with small sprays of 100 times liquid or 50 times liquid. The third and fourth years do not require governance. In recent years, the incidence of juvenile trees has also been increasing. In some regions or in some years, the incidence of juveniles is as high as 30%. In order to control the incidence of juveniles, prevention and control of “multiple-effect rot†may also be used. . It can be sprayed once with 100 times liquid or coated with 50 times liquid before dormant or before germination. The effect of this method is also relatively good, so that 20% of diseased plants can be cured. The prevention and control measures can also be used in the prevention and treatment of branch diseases such as pear, peach, apricot, hawthorn, chestnut, paulownia, poplar, and willow.
Apple rot control measures
[Introduction to Disease] Apple rot disease is the main disease that damages apple branches and is one of the serious diseases in apple production, threatening apple production. Apple rot disease mainly damages branches and rarely causes damage to fruit. Damaged on the thick branches, forming a reddish-brown, water-stained, soft tissue rot spots, squeezed by hand, lesions cave-like subsidence, and brown juice outflow. Black spots are also produced on late lesions. After the onset of fruit branches, the lesions can extend along the fruit stem and onto the fruit to form water-stained rotten fruit.