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花生叶斑病在花生产区普遍发生,可使花生减产4～15%,严重时可达30%以上.花生叶斑病主要有黑斑病与褐斑病两种.褐斑病主要发生在叶部,严重时也侵染茎、叶柄和托叶.叶片上初发病时为黄褐色和铁锈色针头大小的病斑,以后逐渐扩大,形成直径1～10毫米大小不等的圆形病斑,表面淡褐色或暗褐色,边缘有较明显的淡黄色晕圈,有时几个病斑连在一起.在老病斑上生灰色霉状物,排到不规则.茎部、叶柄与托叶上的病斑,呈长椭圆形,暗褐色,中间稍凹陷.
Peanut leaf spot disease occurs generally in the flower production area, which can reduce the peanut yield by 4-15% and in severe cases up to 30% .Among the peanut leaf spot disease are mainly two kinds of black spot disease and leaf spot disease, Leaves, in severe cases also infected stems, petioles and stipules. Leaf blade on the initial incidence of yellow brown and rust-colored needle size lesions, and then gradually expanded to form a diameter of 1 to 10 mm in size of the circular lesion , The surface of light brown or dark brown, the edge of the more obvious yellowish halo, and sometimes several lesions together .In the old lesion gray gray mildew, discharged to irregular.Stems, petioles and stipules On the lesion, was oblong, dark brown, slightly concave in the middle.