Lotus root disease, also known as spoilage disease, is one of the important diseases in the process of lotus root planting. It has a great impact on the production of lotus root. Once sick, the disease field is reduced by 20% and severely by 60% to 80%. Today, Xiaobian talks about the harm of lotus root disease and its prevention and treatment methods.
Incidence pattern:
The lotus root is mainly caused by fungi-like Fusarium and a variety of other pathogens, in which the bacteria invade the plant through the internode wound, the root or the growth point. Lotus roots may occur from May to June to the harvest period, and the period from July to August is prosperous. The optimum temperature for the onset of lotus root is 20 ° C ~ 30 ° C. The newly developed Putian has a mild incidence, and the incidence of the field has been heavy for many years; the soil has moderate pH and good ventilation, and the soil is acidic and the aeration is poor.
Hazard symptoms:
Lotus roots mainly harm the underground stems and make them brown and rot. First, the green leaves are wilted outside the lotus leaves and develop inward and dry. And let the buds and flowers wither. Excavating the underground stems of the diseased plants, it can be seen that the spider-like hyphae and pink sticky substances on the sacs are the conidia of the pathogens.
Control method:
1 The implementation of 2 to 3 years of rotation, to reduce the disease, the use of water and drought rotation is better.
2 use disease-free planting. When planting, first spray with 50% carbendazim 800 times solution, then seal with film for 24 hours, then dry and sown.
3 application of decomposed organic fertilizer. Reapply lime to neutralize heavy acid fields. During the growth period, pay attention to the combination of NPK fertilizer, increase the application of siliceous fertilizer, and advocate the application of micro-fertilizers such as boron, zinc and molybdenum. Do not apply nitrogen fertilizer.
4 scientific tube water. Deep-water irrigation in the affected field to reduce the temperature of the ground to inhibit the growth of the bacteria. Non-disease fields maintain a water depth of 18 to 20 cm and use live water once a month. After the winter, the seriously ill field will turn over the sun-dried soil and reduce the soil and diseased pathogens.
5 timely application. At the time of onset, spray the leaf surface and petiole of the plant with 50% carbendazim 600 times solution for 2 to 3 times, and use the above-mentioned agent to mix 30 kg of fine soil and then apply it under the lotus root to reduce leaf disease and control this. The disease spread. During the growing period, the diseased plants were dug out and brought out of the field for burning.
The above is the hazard and prevention method of lotus root disease. Although lotus root has a great influence on the yield, as long as it is timely prevented, the loss can be greatly reduced.
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