Lettuce leaf coke how to prevent?
The leaves of the lettuce leave the area of ​​the outer leaves or the edge of the heart produce brown areas, some necrosis, and some spread to the veins, tissue necrosis after prone to saprophytic bacteria, leaves too much water loss, performance pale leaf, pulse coke, leaves The coke or leaf margin is scorched or dry.
Preventive measures: First, a reasonable rotation, it is best to carry out 2-3 years of rotation with grass, promote the application of enzyme composting compost or decomposed organic fertilizer, and select disease-resistant varieties, seed dressing with a new high-fat membrane dressing to drive Avoid underground pests and isolate virus infections without affecting germination and ingestion function, strengthen respiratory intensity, and increase seed germination rate. The second is to keep the soil moist and moisture content during the growth period of lettuce to avoid excessively high temperature and low temperature. At the same time, in order to protect the normal root function, the relative humidity should not be too high for a long time, try to keep the normal humidity, increase the air circulation, and help to stop the leaves. Injury; timely topdressing, cultivating and weeding, improving plant disease resistance, and spraying strong stalks to make the stem thick plant stems, leaf hypertrophy, improve the natural taste of lettuce. The third is chemical control. In the early stage of disease, according to the requirements of plant protection, spray specific drugs such as chlorothalonil, thiophanate-methyl, etc., together with spraying 800 times of new high-fat membrane to enhance the efficacy, improve the utilization of effective pharmaceutical ingredients, and consolidate prevention and treatment effect.
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