Amaranth is a perennial vegetable that occupies a long time. With the increase of continuous cropping years, the source of bacteria is concentrated, and the disease is more serious. The incidence rate of individual plots is as high as 70%. To this end, how to prevent and control the occurrence of the disease is particularly important, and its occurrence and prevention are described below.
First, the symptoms of the leaves are damaged, initially dark green water-immersed lesions, the diseased part of the contracture, the leaves turn yellow withered. When the weather is wet, the lesions are soft and rot, with a grayish white cream. The leaf sheath was damaged by brown water-immersed lesions, soft rot, and leaf peeling. The bulbs and roots are damaged by soft rot, which affects the absorption and accumulation of nutrients.
Second, the disease conditions in the summer, high temperature, high humidity, low terrain, poor drainage and poor plant growth, excessive harvest, malnutrition, serious disease.
Third, prevention and treatment methods
1. Rotation of cultivated land and nursery land should be selected from plots where no onion and garlic vegetables have been planted within 3 years.
2. Leveling the land and renovating the drainage system in time. After heavy rain, there is no water accumulated in the raft and the crater is eliminated.
3. Cultivate robust plants. When planting seedlings, select strong seedlings, remove diseased seedlings, pay attention to rooting, do not over-harvest, post-harvest topdressing, control irrigation after summer, and other cultivation measures to make plants grow robust.
4, before the leaves into the summer rain, the lower yellow leaves should be removed, the green leaves should be lifted up, and the horseshoe grass should be loosely tied to avoid the leaves contacting the ground, so that the plants can be ventilated to prevent disease.
5, chemical control from mid-July to early August use 25% metalaxyl WP 600-800 times solution, 64% anti-virus WP WP 500 times, 0.1%-0.2% copper sulphate deep-water irrigation plant roots unit, or selection of the chemical solution when planting root dip have effect.
First, the symptoms of the leaves are damaged, initially dark green water-immersed lesions, the diseased part of the contracture, the leaves turn yellow withered. When the weather is wet, the lesions are soft and rot, with a grayish white cream. The leaf sheath was damaged by brown water-immersed lesions, soft rot, and leaf peeling. The bulbs and roots are damaged by soft rot, which affects the absorption and accumulation of nutrients.
Second, the disease conditions in the summer, high temperature, high humidity, low terrain, poor drainage and poor plant growth, excessive harvest, malnutrition, serious disease.
Third, prevention and treatment methods
1. Rotation of cultivated land and nursery land should be selected from plots where no onion and garlic vegetables have been planted within 3 years.
2. Leveling the land and renovating the drainage system in time. After heavy rain, there is no water accumulated in the raft and the crater is eliminated.
3. Cultivate robust plants. When planting seedlings, select strong seedlings, remove diseased seedlings, pay attention to rooting, do not over-harvest, post-harvest topdressing, control irrigation after summer, and other cultivation measures to make plants grow robust.
4, before the leaves into the summer rain, the lower yellow leaves should be removed, the green leaves should be lifted up, and the horseshoe grass should be loosely tied to avoid the leaves contacting the ground, so that the plants can be ventilated to prevent disease.
5, chemical control from mid-July to early August use 25% metalaxyl WP 600-800 times solution, 64% anti-virus WP WP 500 times, 0.1%-0.2% copper sulphate deep-water irrigation plant roots unit, or selection of the chemical solution when planting root dip have effect.
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