How do you prevent and control blight when growing yardlong beans?
How do you prevent and control blight when growing yardlong beans? Please explain the methods. For yardlong bean blight, the following methods can be used for prevention and control: 1. Symptoms mainly affect stems, leaves and pods, mostly occurring at or near stem nodes, especially near the ground. The diseased part is initially water-soaked, then becomes wet-rotted and constricted around the stem, and the leaves and vines above the diseased part die. ...
How do you prevent and control blight when growing yardlong beans? Please explain the methods.
For yardlong bean blight, the following methods can be used for prevention and control:
1. Symptoms mainly affect stems, leaves and pods, mostly occurring at or near stem nodes, especially near the ground. The diseased part is initially water-soaked, then becomes wet-rotted and constricted around the stem, and the leaves and vines above the diseased part die. When humidity is high, the cortex rots and white mold appears on the surface. Infected leaves initially show dark green water-soaked spots, which later expand into round light brown spots with white mold on the surface. Infected pods also develop white mold on the diseased part and rot.
2. Prevention and control measures
(1) Choose disease-resistant varieties.
(2) Practice crop rotation. Choose well-drained sandy loam for planting, use high beds with deep furrows, plant at a reasonable density so that air circulates and light penetrates, and pay attention to timely drainage after rain.
(3) Chemical control. Spray promptly to protect plants at the early stage of disease onset. 58% Ridomil MZ soluble powder at 500-800 times dilution, 64% Sandofan WP at 500 times dilution, 72.2% Previcur AS at 800 times dilution; spray once every 7-10 days, for 2-3 consecutive times, with good results.
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