Symptoms of jujube trunk rot and the latest control methods
Jujube fruit is rich in nutritional value and is a fairly good tonic in our daily life, with effects such as nourishing blood and improving complexion. Jujube cultivation also has fairly mature techniques in China, but if jujube trees are improperly managed, they will suffer from many diseases. Trunk rot, which the editor will discuss today, is one of them. Trunk rot can seriously harm the growth of fruit trees and cause a large decline in yield. Today, the editor brings you the symptoms and control methods of jujube trunk rot. Let's take a look together!
1. Disease symptoms
Trunk rot mainly harms the branches of fruit trees. On the main branches of adult trees, round, darker-colored lesions appear, and the edges of the lesions are darker in color. The affected parts are raised, can be easily torn off by hand, and are relatively moist; in the later stage, they gradually dry out and the diseased parts become sunken. This is only one symptom. There is another that occurs on both young trees and adult trees, and affected trees usually develop it after freezing injury. Purple lesions appear on the branches, then begin to crack, showing symptoms of water deficiency, with an uneven surface. The lesions gradually expand, and affected young trees die quickly.
2. Control methods
Strengthen management: Strengthening orchard management is the most important thing. After harvest, sufficient base fertilizer should be applied to the orchard. The base fertilizer should reduce the proportion of chemical fertilizers and increase the content of farmyard manure. In particular, the amount of nitrogen fertilizer should be controlled to prevent excessive nitrogen fertilizer from causing excessive vegetative growth of jujube trees, which is unfavorable for the return flow of nutrients in the tree. Improve the tree's resistance and strengthen disease resistance, promptly clean up fallen leaves, fallen fruit, and diseased remnants in the orchard to prevent pathogen breeding and spread, and reduce the incidence of disease.
Reduce pathogens
During overwintering, orchard cleaning should be done promptly, and all fallen leaves and diseased material should be cleared out of the orchard for treatment. Many friends turn all the fallen leaves into the soil as fertilizer. In fact, although this increases the organic matter in the soil, it also provides conditions for bacterial breeding, so we still need to clear them out of the orchard. In autumn and winter, spray the trees with lime sulfur mixture and other agents to improve the jujube tree's ability to adapt to low temperatures. This prevents freezing injury during overwintering, which can indirectly cause trunk rot, and can also effectively kill pest eggs.
Shaping and pruning
Jujube is a large-tree-type fruit tree, so shaping and pruning during the planting process is very important. Reasonable pruning can not only enhance the tree's growth vigor, but also improve the orchard's air permeability and strengthen the utilization rate of sunlight, because if the tree's growth vigor is too weak, pathogens will have an opportunity to invade. It is beneficial to the flower bud differentiation of fruit trees and reduces the incidence of disease. Proper flower and fruit thinning can effectively increase yield and ensure quality.
The above is a brief introduction to the symptoms and control methods of trunk rot. Trunk rot is very harmful to the tree and can even rank among the top few among pests and diseases. It is something we must pay attention to during the planting process. Everyone planting jujube trees certainly hopes for high yield and high quality to maximize their economic benefits, so I hope everyone can manage the orchard well, not only for trunk rot, but to reduce the incidence of various pests and diseases.