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一、叶部病害 1.蛇眼病。症状:大多发生在老叶上。病斑圆形,直径2—5毫米,中央淡褐色至灰白色,边缘紫红色,似蛇眼状,表面有白色粉霉。防治方法:发病初期喷布500—700倍75%百菌清可湿性粉剂液;或800倍40%多菌灵胶悬剂液,10天后再喷1次,并及时摘除病叶集中处理。 2.轮纹斑病(又称叶枯病)。症状:多在叶缘发生。病初为紫褐色小斑点,扩大后由于受叶脉限制而形成“V”形病斑,长约0.5—2厘米,中部灰褐色,外缘紫褐色,具有轮纹;后期病斑干枯,其上生
First, leaf disease 1 snake eye disease. Symptoms: Mostly occur on older leaves. Focal spot circular, 2-5 mm in diameter, the central light brown to off-white, purple edge, snake-like, white powdery mildew on the surface. Prevention and treatment methods: early onset of spraying 500-700 times 75% chlorothalonil WP; or 800 times 40% carbendazim suspension solution, 10 days and then spray 1, and timely removal of sick leaves focus on treatment. 2. Rana leaf spot (also known as leaf blight). Symptoms: More occurs at the leaf margin. The beginning of the disease is purple brown small spots, enlarged due to the limitations caused by the veins and the formation of “V ” -shaped lesion, about 0.5-2 cm, the central gray brown, rim purple brown, with round pattern; late lesions dry, Its students