What to Do About Root Rot in Napa Cabbage? Detailed Explanation of Causes and Control Methods
Root rot is a common disease when growing napa cabbage. Root rot causes napa cabbage to gradually wither and die, which seriously affects yield and quality and reduces farmers' economic returns. So what causes root rot in napa cabbage? And what should be done about root rot? Let's go through a detailed introduction together.
1. Root rot caused by waterlogged roots
Napa cabbage is a semi-cold-tolerant vegetable. It likes a mild, cool climate and is neither cold-tolerant nor heat-tolerant. At the same time, it likes a moist environment but is not tolerant of waterlogging. When planted in a high-temperature or low-temperature environment, if it encounters a rainy season and heavy rain causes excessive water accumulation in the soil, the root system will die from lack of oxygen, resulting in waterlogged roots. In addition, if napa cabbage is in a high-temperature period during the early growth stage, high-temperature-type waterlogged roots will occur; conversely, if the temperature is too low during the late growth stage of napa cabbage, low-temperature-type waterlogged roots will occur.
2. Root rot caused by soft rot disease
Soft rot disease is also one of the causes of root rot in napa cabbage. When waterlogged roots occur in plots with higher terrain and easy water accumulation, soft rot disease is extremely likely to occur. In addition, excessive application of nitrogen fertilizer, or plants being bitten or damaged by pests, can lead to pathogen invasion and infection with soft rot disease. Soft rot disease mainly harms the root and stem area. The petioles appear water-soaked, and the outer leaves lose water and wilt. When the disease is severe, the root and stem rot and are filled with yellow sticky matter, giving off a peculiar foul odor and causing the whole plant to rot.
3. Preventive measures for waterlogged roots
Choose plots with higher terrain and good drainage for planting, so as to avoid excessive soil water accumulation that leads to waterlogged roots. In the early growth stage, if high-temperature weather occurs, shading measures can be taken to prevent high-temperature-type waterlogged roots; in the late growth stage, low temperature can be raised through plastic film mulching and fertilization to prevent low-temperature-type waterlogged roots. During planting, intertillage and weeding can increase the permeability of the plants, allowing the root system to breathe and extend normally. In addition, in the late growth stage, intertillage can also raise the low temperature and reduce the chance of freezing injury. After rain, drain water in time to prevent waterlogging. When watering, strictly prohibit flood irrigation to avoid waterlogged roots.
4. Control methods for soft rot disease
Preventive measures for soft rot disease likewise avoid planting in low-lying, heavy clay plots. The previous crop in the planting plot should avoid solanaceous, melon and fruit, and cruciferous vegetables. When the disease occurs, agricultural streptomycin sulfate or new streptomycin can be used for spray control, once a week, and depending on the condition, continuous spraying 2-3 times is sufficient.
The above are the causes of root rot in napa cabbage and the control methods. We hope this helps you. If you want to learn more about vegetable cultivation knowledge, please follow us.