The latest control methods of bean coal mildew

Bean coal mold is also called bean leaf mold. When the disease is serious, it will cause the leaves to dry up and fall off early, which brings huge economic losses to farmers. So what are the symptoms of bean mildew damage? How to prevent it? Let's take a look at it together with Xiaobian.

1. Damage to plants

Bean coal mold mainly damages leaves, serious will also damage vines, petioles and pods, the disease spots initially appeared not obvious near circular yellow-green spots, then yellow-green spots appeared purple-brown or purple-red, gradually expanded, the edge of the disease spots is not obvious. When the leaves turn yellow, the leaves around the spots can remain green, and when the humidity is high, dark gray or gray-black soot mold will be produced on the surface of the spots, especially on the back of the leaves. The plaques sometimes combine to form large, amorphous plaques. When the disease is serious, the diseased leaves are bent, dry and fall early, and only the young leaves at the tip are left.

2. Rules of occurrence

In spring, the disease began to occur in the middle of April, and the peak period was June to July. The high temperature and high humidity environment was conducive to the outbreak of the disease, and the incidence would be more serious. Bean coal mold often occurs in continuous cropping, spring sowing beans are often more serious than late sowing beans, especially spring sowing beans are the most serious.

3. Prevention and control methods

First of all, it is necessary to select varieties with strong disease resistance to increase the disease resistance of plants, and then it is necessary to reasonably plant closely when planting, and maintain good permeability in the field, so as to avoid excessive humidity and induce diseases. In rainy season, we must strengthen the drainage work in the field, so as to avoid standing water and root rot, so as to give the bacteria an opportunity to take advantage of, and at the same time, reasonably increase the application of phosphorus and potassium fertilizer, which can enhance the disease resistance of plants. In bean coal mold disease should be removed in time, in harvest to clear the field in time, burned or buried in time. At the early stage of disease, thiophanate-methyl, sukeling, xinwansheng and sulfur suspension agent chicken heart can be sprayed once every 10 days for continuous control for 2-3 times, or bisbenztriazole emulsifiable concentrate can be sprayed once every 10-20 days.

The above is the bean coal mold control method introduction, hope to help you, want to know more related knowledge, please pay attention to us.