Rhizoctonia solani is mainly responsible for stems, leaf sheaths, and ear buds. The occurrence and prevalence of maize sheath blight, in addition to the degree of disease associated with corn, has a direct relationship with the number of hyphae and sclerotia in winter. It is heavier to use summer corn. It can suffer from about 1 meter of corn to adult plants. When the damage is heavy, the leaves are wilting and even the whole plant is dead. Damage to ear can lead to ear rot.
Rhizoctonia solani is a disease that is spread by creeping mycelium and spreads in a short distance. It is generally rich in nutrients, especially when nitrogen fertilizer is rich, mycelia and sclerotia grow well and the pathogenicity is strong. The temperature required for mycelium growth is 10~38°C, and the optimum temperature is 26~31°C. If the temperature is lower than 20°C and the relative humidity is below 75%, it is not conducive to mycelial growth.
Control methods:
Removal of the diseased planted corn was followed by timely removal of the diseased plant and deep turning to reduce the initial inoculum source in the following year. In the corn growing period, combined with cultivating and weeding, it was discovered that early diseased plants stripped off the diseased leaf sheath and destroyed it in a concentrated manner.
Cultivation management promotes proper close planting, enhances ventilation and light transmission; pays attention to draining water in the field in time and reducing the humidity in the field; and adopting reasonable fertilization to avoid excessive nitrogen fertilizer and overgrowth measures can reduce the degree of disease.
Chemical control can use 5% Jinggangmycin agent 50 ~ 70 ml per mu or 40% sclerotin net 100 g water 80 ~ 100 kg spray.
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