First, the main symptoms: the disease is mainly to invade the leaves, in serious cases also damage the petiole and soybean meal, early onset of the leaves on the back of the stars whitish yellow and white spots, spots gradually increased until the entire densely covered leaves. On the corresponding back surface of the lesion, yellow-brown slightly protruding spots were generated. After the epidermis ruptured, red-brown powder was scattered. Leaves yellow and fall off, the plants are short, the pods are small and small, the growth period is shortened, and finally it is dead and dead. The whole growing period of beans can be infected with pathogenic bacteria. During the period between the beginning of flowering and fruiting, the resistance is weakened, the susceptibility is enhanced, and the source of infection is reduced.
Second, the route of transmission and disease conditions: This disease is caused by the single spore rust fungi. The summer spores spread by the airflow and repeatedly infested. In the summer and autumn, there is continuous rain, heavy nights, high humidity, and heavy onset. In addition, the incidence of plants is heavy under low-lying conditions, poor drainage, high density, excessive nitrogen fertilizers, and plant madness.
Third, prevention and control methods:
(1) Strengthen drainage and discharge of moisture, especially in the prone period of disease, timely ventilation and reduce the air humidity in the greenhouse.
2 Rational close planting, strengthen cultivation and management, so that plants grow robustly.
3 clean the pastoral. After the harvest, field residues should be removed and burned. The former crop was selected as a plot for planting grasses, and the former crop was not selected for the cultivation of legumes or peanuts.
4 Chemical control: Control of pesticide application in the early stage of the disease. The agent may use 50% sulfur suspension 150 to 300 times, or 75% thiophanate-methyl wettable powder 1000 times, or 50% carbendazim wettable powder 800 to 1000 times, every 8-10 Spray once a day. Or with 15% triadimefon 1500? 2000 times. Spray every 15-20 days.
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