玉米锈病主要发生在生长后期,病害严重时,叶片上因布满锈色病斑而影响植株光合作用及代谢,导致减产10%~30%。发病症状病害可以发生在玉米植株地上部的任何部位,以叶片发病最为严重。发病初期,叶片上散生黄色小斑点,病斑逐渐隆起,形状为圆形或椭圆形,颜色呈黄褐色或红褐色。植株生长后期,在病斑上逐渐形成黑色突起,破裂后散出黑色粉状物,为病菌的孢子。 Corn rust mainly occurs in late growth stage. When the disease is serious, the photosynthesis and metabolism of the plants are affected by the rust spots on the leaves, resulting in 10% -30% reduction in production. Disease symptoms can occur in any part of the upper part of the corn plants, leaves the most serious disease. Early onset, scattered on the leaves yellow small spots, lesions gradually bulging, the shape of a round or oval, the color was brown or reddish brown. Late plant growth, the gradual formation of black spots on the disease, rupture of the black powder out of bacteria for the spores.