The Prevention and Control Techniques of Rust Disease Caused by Broad Beans Disease
Rust: Rust is one of the most common diseases of broad beans, which mainly damage the stems and leaves of broad bean. At the beginning, yellowish spots appeared on both sides of the leaves, and were later deepened into yellow-brown and rust-brown. Spots expand and bulge, the summer spores heap. In the later leaves and stems produces a dark brown lesions, oval or spindle-shaped, is the teliospores heap. Prosperous growth, poor ventilation, and poor drainage are also prone to disease. After the onset of broad beans, the leaves are dry and the grain is not full. When the disease is severe, the plants die, which seriously affects the yield. The rust spores spread with the airflow. After the spores fall to any part of the broad bean plant, the spores can germinate and invade when the temperature and humidity are appropriate. The earlier the onset of rust, the greater the loss of faba bean production. Control measures: 1. Cultivation measures: Remove the late-maturing bean strains and residual diseased strains in shading and wet locations. Always pay attention to the elimination of serious diseases. Early maturing varieties mature or harvest before rust occurs, which may prevent the occurrence of rust. 2. Chemical control: The Bordeaux mixture with 0.25%~2% concentration is sprayed when the disease is first discovered. It is sprayed once a week or every 2~3 weeks during the growing season of broad bean until the broad bean is mature. The use of 500 times Daisen zinc liquid or Fumei double spray once every 10 days, there is a certain effect; with the usual amount of triadimefon spray, even spray 2 times, the control effect is significant.
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