First, symptoms: beans, stems, leaves, flowers and pods can be infected. After infection, spots appear 11 to 15 cm above the neck. The surrounding area is dark brown, with light brown or light yellow in the middle. The skin of the dry spot is broken to form a fibrous shape, and when the humidity is high, a layer of gray mold grows. Sometimes the bacteria invade from the branch of the vine, and the diseased part forms a water-soaked spot in the depression, which causes wilting. During the seedling stage, the cotyledon was damaged and drooped in water-like form. The posterior leaf margin grew out of the gray mold layer, which was the conidiophore and conidia of the pathogen. The leaves become infected, forming large ring veins, which are easily broken in later stages. The infected fruit first infects the declining flower, and then spreads to the pod, and the lesion starts with a pale brown to brownish, soft rot, with a gray mold on the surface.
Second, prevention and control measures: 1, timely removal of diseased leaves, fruit disease, in order to avoid the spread of germs when removed, with a plastic bag and picking again, even with the bag out of the field to focus on the destruction. 2. Strengthen the management of the field, make it densely planted, and pay attention to ventilation and light transmission. The disease is easy to attack when the relative humidity of the air is high, so you must avoid the accumulation of water in the field. 3. The sporadic diseased leaves are found to be controlled in time after planting. The available pharmaceutical agents are: 50% Sickos WP 1500 to 2000 times, or 50% acetaminophen wettable powder, 50% Nullilink WP 1000～7500 times liquid, 50% acetaminophen wettable powder 1000 times liquid plus 90% triethylaluminum phosphate(ethylaluminophosphate) wettable powder 800 times liquid, 45% keep multi-suspension 4000 times liquid, 50% mix Kill 600 times of the suspension of the suspension agent or use of oryzamil or 50% polymyxin wettable powder 900 times.
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