How to effectively prevent and control white rust?

White rust damages leaves, leaf sheaths and stems. In the early stage of the disease, the front and back of the leaves and the leaf sheath are scattered with slightly raised brown vesicular spots (summer spore pile), and the blisters emit rust-colored powder after the blisters are ruptured, and the leaves and leaf sheaths present gray to black vesicular spots (winter spore piles) in the later stage, which are long and the epidermis is not easy to break. In severe cases, the affected part is covered with lesions, and the amount of water transpiration increases dramatically, resulting in the death of leaf sheaths and leaves.

The disease generally begins in late April, and the peak period is late June and early August.

Prevention and control measures: First, pay attention to finding disease-resistant varieties. Second, strengthening cultivation management can help reduce the incidence of disease. The third is to spray drugs as early as possible to control the disease in the early stage of the disease. The drug is the same as flax leaf spot.

Careful observation will find that flax leaf spot mainly occurs in the season of high temperature and humidity, the higher the humidity and the higher the temperature, the stronger the reproduction ability of the fungus, especially in the summer, the most serious phenomenon is from August to September. Scientific fertilization! Before planting, the field needs to be fertilized with farmhouse fertilizer and calcium, magnesium and phosphorus fertilizer as the base fertilizer of the callus!

Half a month after planting, urea, potassium chloride and other fertilizers were applied to promote the tillering of the callus! Of course, in order to balance nutrition, micro fertilizer is indispensable, and it should be applied in a timely manner! Robust plants will be more resistant to disease.

Conidia overwinter on old plants or diseased residues, and when the conditions are suitable, conidia are produced for initial infection, and after the onset of the disease, conidia are produced by airflow or rainwater sputtering for re-infection, so that the disease expands and spreads. High temperature and high humidity are suitable for the onset of disease, the growth temperature of the fungus is 5-35, and 1500 2000 kg of human and animal manure is generally applied per mu, and 45 50 kg of calcium, magnesium and phosphorus fertilizer are used as base fertilizer.

Leaf embroidery disease, callus borer, aphid, white cicada from June to July due to high temperature and humidity, coupled with plant height and leaf rust is prone to occur, generally can be sprayed with Baumé's stone sulfur mixture + new high fat film 800 times liquid or sodium dirust new high fat film 800 times liquid spray. At the same time, press 1 piece of mud to the rhizosphere to spread the tiller buds in all directions to improve the nutritional status and ventilation and light transmission between the plants. 1 week before transplanting and planting, remove the excessive growth potential and tendency"Maleization"seedlings to reduce the occurrence of male calluses.

Sprouted from stolons"Wanderer"It cannot be used for seeding.

In the process of cultivating the white callus, varieties with strong resistance and adaptability should be selected. Common single-season cocoon varieties such as Ivory cocoon, Jiangshu cocoon and E-cocoon No. 1 bell double-season cocoon (two-ripe cocoon) varieties such as Xiaowaxtai, Liangtouzao, Guangyi cocoon, Liu Tan cocoon, Qunli cocoon, Zhe cocoon No. 2 and Ecoon No. 2, etc. 10 15 days after transplanting, 10 kg of urea and 10 15 kg of potassium chloride were applied to promote tillering.

At the same time, an appropriate amount of zinc, silicon, boron and other micro-fertilizers should be applied to the field in a timely manner to promote the growth and robustness of the white.

Hello dear. When chemical control is used, Tanyan should be sprayed with pesticides in a timely manner, and it is advisable to prevent early prevention and small prevention, and when there are sporadic spots in the field, they should be treated with pesticides. You can choose 3000-3500 times of enaconazole, or 25% difenoconazole 2000-3000 times, or 80% mancozeb 800 times, or 12% rustyl 1000 times of any kind of agent, before pregnancy, it is best to alternate the medication.

Let the emperor spray once every 7-10 days, and apply the pesticide 2-3 times in a row. Pay attention to the cautious use of fungicides during the pregnancy period to avoid the inhibition of the white and black powdery mildew fungus, which will lead to the production of male calluses in the field. When applying pesticides, fine mist should be sprayed, and the front and back sides of the leaves should be sprayed to improve the control effect.