Symptom Identification and Control Methods of Jujube Trunk Rot
Jujube is rich in nutritional value and is a relatively good tonic in our daily lives, with effects such as nourishing the blood and beautifying the complexion. Jujube cultivation in China also has relatively mature techniques, but if jujube trees are managed improperly, they will suffer from many diseases, and trunk rot, which I am discussing today, is one of them. Trunk rot seriously harms the growth of fruit trees and causes a large drop in yield. Today I bring you the symptoms and control methods of jujube trunk rot. Let's take a look!
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 area is raised, can be easily torn off by hand, and is relatively moist; in the later stage it gradually dries out and the diseased part becomes sunken. This is only one symptom. There is another type that occurs in both young and adult trees, and affected trees usually develop it after freeze damage. Purple lesions appear on the branches, then begin to crack, showing symptoms of water deficiency, with an uneven surface, and the lesions gradually expand; affected young trees die quickly.
2. Control Methods
Strengthen management: Strengthening orchard management is the most important thing. After harvesting, apply sufficient base fertilizer 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 its disease resistance, promptly clean up fallen leaves, fallen fruit, and diseased debris in the orchard to prevent the breeding and spread of pathogens, and reduce the incidence of disease.
Reduce Pathogens
During overwintering, orchard cleanup should be done in a timely manner, and all fallen diseased leaves should be cleared out of the orchard for disposal. 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 freeze damage during overwintering, which can indirectly cause trunk rot, and can also effectively kill insect 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 light, because if the tree's growth vigor is too weak, it will give pathogens an opportunity to invade. It is beneficial to the flower bud differentiation of the fruit tree 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 body and can even rank among the top few among pests and diseases. It is something we must pay attention to during the planting process. When planting jujube trees, everyone certainly hopes for high yield and high quality so as 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.