Control methods of powdery mildew of Zizania caduciflora

Zizania caduciflora, also known as tall bamboo shoots, is a kind of vegetables grown in swamps, silt and river fields. Zizania caduciflora is prone to a variety of diseases and insect pests due to the humid growth environment, among which the main disease that harms the edible parts is the smut that I would like to introduce to you now. A large amount of black powder will appear in the victimized Zizania caduciflora, the harm is serious, and the yield decreases in a straight line. How to prevent its occurrence and spread, and how to treat it is the focus of our article.

I. Hazard performance

It mainly harms leaf sheath and swollen stem. The damage to the lunar sheath will appear green dot disease spot, and then gradually grow into an oval tumor-like process, followed by a large number of black spore clusters, showing a black powder. Smut fungus in the whole activity of Zizania caduciflora damaged the middle tissue bulging, Zizania latifolia into a short coarse shape, surface seedlings into a ditch shape.

Second, bacterial infection

The harm was caused by Zizania caduciflora, which overwintered mainly with perennial mycelia in diseased tissue and soil. It occurred in many places all over the country, regardless of north and south, strong fecundity, high temperature and humidity, and epidemic in a large area.

III. Prevention and control methods

1. Rotation

The field where the disease occurs should be rotated with terrestrial vegetables after harvest in the current season, and of course, only vegetables that are not infected with the disease can be rotated.

two。 Disinfection

The seedlings planted must go through quarantine or the seedlings cultivated by virus-free technology can be finally planted. In addition, fungicides to be sterilized can be sprayed in the field before planting to prevent bacterial infection in the soil. Generally, 50% carbendazim wettable powder 800 times solution can be used for spraying.

3. Administration and Management

For the leaves at the base, the old leaves can be removed to prevent the invasion of leaf sheaths from the wet environment at the base, and the excessive tillers should be treated in time at the initial stage to ensure a suitable interval in the field, which can reduce the environmental humidity and reduce the possibility of diseases. Long-term continuous use of enough compound fertilizer can resist diseases, irrigation in shallow water at tillering stage, deep irrigation at high temperature in summer to protect roots, and as long as wet mud is maintained in the later stage.

4. Spray medicine

Before the occurrence, Bordeaux liquid protective agent was sprayed once a month to prevent. At the initial stage, 75% chlorothalonil wettable powder solution was sprayed on the whole plant, once every three days, followed by about 2 times, and the number of times, medication and dosage could be adjusted according to the condition. The epidemic of the disease should be sprayed alternately with 25% carbendazim wettable powder and 75% chlorothalonil wettable powder 600 times, once every 7 days, continuous control 3-4 times, and the number of spraying increased in the rainy season.

The occurrence of powdery mildew of Zizania caduciflora can not provide conditions for the occurrence of pathogens, in addition, prevention, quarantine is also very important, the last is the timely use of drugs after the disease, do not repeat, should be changed. In short, the content of the article provides reference, thank you for reading.