Control methods of white rust of amaranth

Amaranth not only has excellent edible value, but also has high medicinal value, so amaranth is also deeply narrow-minded by many people, but it will inevitably suffer from a variety of diseases and insect pests in the process of planting. White rust is one of the common, the following editor to bring you the prevention and control of amaranth white rust, let's take a look.

1. The regularity of the disease

White rust is a common disease of amaranth. When the disease is prevalent, the rate of diseased plants can reach 20%-40%, sometimes as high as 80%. The diseased leaves are covered with blister spots, affecting the appearance and quality of vegetables. Because the pathogen overwintered or oversummer with spores in the disease residue, soil and fertilizer, it could survive for more than two years. The land with serious disease in the previous year was prevented and treated, but it could continue to occur in the second year. The disease can occur in the whole growing period of amaranth, and it is more serious in the environment of high temperature and humidity. in addition, low-lying terrain, improper irrigation, over-dense planting, poor permeability and partial application of nitrogen fertilizer will also cause serious disease. If the sowing is too dense, the disease is more serious, while strip sowing is beneficial to ventilation and dampness, and the disease is lighter.

2. Seed and soil treatment

If you like the seeds of amaranth during the shelf life, you'd better bask in the sun for 1-2 hours, in order to kill the surface bacteria, improve the germination rate, mix seeds with chemicals, and reduce the risk of diseases. Similarly, the seedbed can also be disinfected with agents to reduce the number of pathogens, inhibit its growth and reproduction, and reduce the probability of diseases.

3. Agricultural prevention and control

Select varieties with strong disease resistance, such as purple amaranth, the incidence of disease is lower than that of amaranth, serious disease areas or plots, you can rotate with non-host crops for more than one year. Select good drainage plots for planting, make good drainage ditches to avoid flooding, drain and drop stains in time after rain, reduce field humidity, properly close planting, and remove plants in time if the plants are too dense, so as not to cause field closure, affect permeability and improve disease resistance. Reasonable fertilization, increase the application of phosphorus and potassium fertilizer, avoid partial application of nitrogen fertilizer, in order to enhance plant resistance, it is found that diseased plants should be removed and burned out of the field in time to effectively control and restrain the spread of the disease.

4. Chemical control

At the initial stage of the disease, mancozeb, copper hydroxide, aldicarb hydrochloric acid saline and other agents can be sprayed, once every 7 to 10 days, for 2 or 3 times in a row. At the same time, 30 ml of yield-increasing bacteria or 6000-9000 times of phytogenin per mu were sprayed alternately, the effect was better, but attention should be paid to stopping the use of drugs 15-20 days before harvest.

The above is an introduction to the prevention and control of amaranth white rust. I hope it can help you. If you want to know more about it, please follow us.