Brown spot can infect the stems, leaves, pods, and seeds of broad bean, starting with red spots on the leaves and later expanding into round or oblong or irregular spots. The center of the lesion is pale gray with dark brown and red edges. The surface often has concentric ring patterns, and the lesion often detaches in the center to show perforation symptoms. In the condition of drought, the center of the lesion is white, and in the wet condition, the center is grey or grayish white. The lesions on the stems are round, oblong or oval, with grey centers and red edges, usually deep into the host tissue. The lesions on the pods are round or oval, dark brown, and black on the edges. The lesions are usually deep into the host tissue. The measures to control brown spot are: 1 round. 2 Do not introduce diseased seeds from outside, or use Fairchild or Bitter Tomatoes for dressing, and mix 0.3-0.5 kg per 50 kg of seeds. 3 drug control. Spraying with 0.5%-1% Bordeaux mixture can also be used with captan, dichloroquinone, and 50% thiram. The Bordeaux mixture can be sprayed once every 2-3 weeks between the stage of disease development and the development period to control the disease. 4 Clear and destroy field sick plants. Shaoxing Gangfeng Hospital Products Co.,Ltd. , https://www.gangfenggauze.com