What are the control methods for dragon fruit fusarium wilt?
Dragon fruit is a common fruit in our lives, and during cultivation, fusarium wilt is a common suppressive disease in dragon fruit cultivation, causing plants to gradually dry up and die, resulting in relatively large losses for fruit growers. So what causes dragon fruit fusarium wilt? And how should it be controlled? Let's learn about it together.
1. Symptoms of fusarium wilt
After dragon fruit develops fusarium wilt, its stem segments lose water, fade from green to yellow, and wilt, then gradually dry up until the entire plant dies. If the environment is relatively humid, pink mold layers will also appear on the diseased plants. The disease first appears on the branch nodes in the middle and upper parts of the plant. At first, the disease occurs at the top of the stem nodes, with gray-white irregular lesions appearing on the ridge edges, then gradually spreading downward, forming sunken lesions and gradually drying up, finally forming gaps or holes.
2. Disease pattern
Dragon fruit fusarium wilt is caused by Fusarium oxysporum f. sp. and the pathogen overwinters in diseased residues or soil. After temperatures rise in spring the following year, it begins to develop, then spreads through rainwater, invading through wounds on the plant and causing disease. Rainy weather in early spring and early summer is favorable for the occurrence and spread of fusarium wilt. If the orchard has low-lying water accumulation, is shaded and humid, and has a large number of insect pests, all of these are favorable for the occurrence of fusarium wilt.
3. Control methods
After harvesting in autumn and winter, clean the orchard in time, promptly remove diseased branches and diseased parts, and take them out of the field to burn or bury deeply, thereby reducing the pathogen. Implementing reasonable crop rotation can also reduce the occurrence of the disease. In addition, do a good job in orchard irrigation and drainage, apply sufficient base fertilizer, and topdress in a timely manner. Choose decomposed organic fertilizer or farmyard manure as much as possible, increase the application of phosphorus and potassium fertilizers, improve the plant's disease resistance, strengthen plant training, and top the plants in a timely manner to prevent lodging. During agricultural operations, do not injure the roots, so as not to create conditions for pathogen invasion. If disease occurs during the growing period, promptly pull out diseased plants, remove diseased stems and old stems, take them out of the field for deep burial, and spray pesticides throughout the orchard for propagation, or pour pesticides at the root and stem base during planting, which gives a relatively good control effect.
The above is an introduction to the control methods for dragon fruit fusarium wilt. We hope it can help you. To learn more related knowledge, please follow us.