1. Symptoms: Corn round spot disease damage ear. Lobular leaves, leaves and leaf sheaths. Damage ear, resulting in ear rot, germs can reach the cob. Blackened depression in the diseased part, causing the ear to deform and bend. The seeds became black and dry. The lesions were scattered on the leaves, initially in water-soaked, light green or yellowish spots, later expanded round or oval, with concentric ring patterns, the lesions were light brown in the middle, and the edges were brown. The lesions on the temporal lobe were brown spots at the beginning and expanded to large round spots. They also had concentric ring patterns and a dense layer of black mold on the surface.
2. Incidence of disease: As the incidence of heavier panicles, so the role of bacteria seed is greater, some susceptible seeds can not germinate and decay in the soil, sometimes causing the onset of larvae or withered. The residual mycelium left on the residue of the diseased plant residue and the grain of the ear on the straw or the straw can safely survive the winter and become the primary source of infection in the second year of field disease. When the conditions of wintering germs are suitable in the second year, the spores spread to the corn plants and germinate and invade. The conidiospores produced on the lesions were spread by wind and rain and reinfested.
3. Prevention and control methods: 1. The quarantine inspection should pay special attention to not adjusting seeds from the wards and selecting disease-resistant varieties. The main cause of severe disease in China is the Kyrgyz 63 inbred line. 2. Chemical control can be carried out during the height of corn silking and focus on spraying ear. With 25% triadimefon per acre 100 grams of water 50-75 kg of water spray, generally even two times.
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