Apple rot disease is a major threat to apple orchards, primarily affecting branches rather than fruits. It significantly impacts apple production by causing severe damage to the tree's structural parts. The disease manifests as reddish-brown, water-soaked, and soft rot spots on thick branches. When pressed, these lesions become sunken with brown exudate, and black spots may appear on older lesions. In more advanced stages, the infection can spread from the branch into the fruit through the stem, resulting in water-soaked and rotten fruit.
The pathogen overwinters in the form of hyphae, spores, and infected plant residues, including dead bark, pruning wounds, insect damage, and old bark. Even healthy branches may carry latent bacteria that remain dormant until the tree’s resistance weakens. This often occurs during periods of low vigor, such as before and after bud break, when the tree is most vulnerable. Trees with frost damage or high insect infestations are also more prone to infection. Additionally, older trees tend to be more susceptible than younger ones due to their reduced resilience.
To effectively manage apple rot disease, a combination of preventive and curative measures is essential. These include removing rough bark, clearing dead branches, and applying protective sprays before bud break. A 100-fold dilution of "Multi-Effect Rot Destroyer" is typically used for full-tree spraying. One week later, a 50-fold solution is applied with a brush to treat the trunk, main branches, and large wounds. If lesions are present, a small blade can be used to apply the treatment directly. A second application is recommended one week after that, known as the "second largest cure."
For severely affected orchards, the first year involves intensive treatment, while the second year requires lighter applications. By the third and fourth years, the disease tends to subside. Juvenile trees have also shown an increasing incidence, sometimes reaching up to 30% in certain regions. To control this, preventive treatments using the same product—either a 100-fold spray or a 50-fold coating—can be applied before dormancy or before bud break. This method has proven effective, curing about 20% of infected trees.
These strategies are not only applicable to apple trees but also beneficial for managing similar diseases in other fruit-bearing trees such as pears, peaches, apricots, hawthorns, chestnuts, paulownias, poplars, and willows. Implementing these practices ensures long-term health and productivity of the orchard.
Canned Bigeye Tuna,Bigeye Tuna Chunk in Oil Can,Tuna Salad Can
Zhejiang Ocean Family Co., Ltd., , https://www.ocean-family.com