The latest control methods of white rust of hollow cabbage

Hollow cabbage originates from tropical China and is widely distributed in Southeast Asia. Now it is widely cultivated in South China, Central China, East China and Southwest China. White rust is a common disease of water spinach, which is widespread and harmful to leaves, petioles and tender stems. when it occurs seriously, it significantly reduces the yield and quality, and even leads to a bad harvest. Let's take a look at the prevention and control methods of white rust in water spinach.

Symptom expression

The disease spot is born on the back of the leaf, the leaf front initially appears yellowish to yellow spot, then gradually turns brown, the disease spot is larger, the leaf back gives birth to white protuberant blister spot, nearly round or oval to irregular shape, sometimes heals into larger blister spot, later blister spot ruptures and scatters white sporangium, when the leaf is seriously damaged, the disease spot is dense, the diseased leaf is deformed, and the leaf falls off.

Disease condition

1. Continuous cropping land, the previous crop is seriously ill, there are many bacteria in the soil, or low-lying stagnant water in the terrain, bad ventilation, or sticky soil, and the soil is sour.

2. Too much nitrogen fertilizer, too dense cultivation, depressed between plants and rows, not ventilated and transparent.

3. Seed carrier, nutritionist for raising seedlings, and organic fertilizer are not fully mature or infected.

4. Rainy or moldy rain comes early in early spring, warm and humid climate, rainy, foggy, re-dew or cold spell in autumn is easy to occur.

5. Greenhouse cultivation is often in order to keep warm without letting out air and moisture, which is easy to occur when the humidity is too high.

Prevention and cure method

1. Select high-lying and dry fields and cultivate them in deep ditches and high beds, so that the rain can not stop stagnant water.

2. It is an important measure to control diseases and pests by using herbalist as covering soil after sowing and spraying insecticide and germicidal agent before transplanting.

3. The organic fertilizer used should be fully mature and should not be mixed with the residue of the previous crop.

4. Aseptic soil should be selected for flood-drought rotation and seedling cultivation, and it should be exposed to the sun for more than three weeks before use.

5. Those cultivated in the greenhouse can be irrigated in the summer leisure period, covered with plastic film on the ground, closed for several days, and sterilized by high temperature.

6. select disease-resistant and coated seeds and sterilize them with seed dressing agent or seed soaking agent if they are not coated.

7, reasonable close planting, timely removal of diseased branches, diseased leaves, diseased plants, and take out of the field to burn, disease point application or quicklime.

8. Plastic film mulching cultivation can prevent germs from harming aboveground plants in the soil.