How to control leek disease

In the process of cultivation of leek, it is often subjected to serious damage to the disease, causing great economic losses to the farmers, and reminding the vegetable farmers to pay attention to prevention.

Symptoms: After the leaves become infected, they appear as dark green water. The sick department is obviously contracted after dehydration. The leaves are rotted and rotted. When the humidity is high, the diseased part produces sparse white mold; the pseudo-stem suffers from flooding and light brown rot. Leaf sheaths are easy to fall off, and when the humidity is high, white sparse mold layer grows on them, namely sporangia and sporangia of pathogenic bacteria. The bulbs were damaged, the root disk was immersed in water, light brown to dark brown rot, and the light bulbs inside the longitudinal bulbs were light brown, affecting the nutrient storage of the plants. The growth was inhibited, the new leaves were delicate, the lesions brown rot, and the root hairs were significantly reduced. Affecting water absorption, rooting life is greatly shortened.

The characteristics of the disease: pathogenic bacteria in the overwintering disease strains or overwintering with the diseased body in the soil. The germs are re-infected by means of irrigation water, rainwater, airflow, and agricultural operations. The optimum temperature for disease occurrence is 26-32 degrees, high humidity is conducive to disease, soil water content is large, and air humidity is heavy. Especially in greenhouses and other protective cultivation environment, if you do not pay attention to ventilation and dehydration, often more exposed to more easily induced damage and more serious damage, greenhouse leakage is often easy to form the center of the disease. Poor management of fertilizers and water, especially the application of nitrogenous fertilizers or planted land, etc. will aggravate the disease.

Control methods:

1. Change crops to avoid planting for consecutive years.

2. Field management: Small water ground irrigation is used to spread water through the water, so if the water is flooded, the water absorption capacity of the roots is weak, and the indoor humidity is too high and the disease occurs. Rational fertilization based on the application of base fertilizer, pay attention to the combination of nitrogen, phosphorus and potassium. Disposal of sick and sick bodies is the main cause of the spread of leek disease.

3, drug control: the early onset of spraying. If the onset is severe, spray once every 10-15 days and spray 2-3 times. 72.2% Prokaryl 600 times liquid, 72% DuPont Kelu wettable powder 700 times, 50% dilute morpholine wettable powder 1500 times, 72% metalaxyl manganese zinc 500 times, etc. can be used for spraying. Every other day for about 7 days, even spraying 2-3 times can effectively control the spread of the disease.

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