Symptoms of rust: Rust is widely distributed in the planting areas of legumes, grasses, and forage crops. It causes serious damage to alfalfa, clover, ryegrass, and duck grasses. It generally produces chlorotic spots on stems, leaves, and veins. The outer edge of brown, small spots with yellow or light halos, turned dark brown later, and there were rust-colored powders on the lesions.
Prevention:
1. Choose disease resistant varieties;
2. Appropriate application of phosphorus and calcium fertilizers, and avoid applying high nitrogen fertilizer in summer;
3, timely cutting, grazing, to reduce the sorghum grass original; generally do not use chemical pesticides.
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