Recently, Yan Chuanyong, a peasant in Yanjia Village, Qudi Town, Jiyang County, Shandong Province, reported that the lettuce in the greenhouse had developed a strange disease. He started to rot from the base of the stem, and after a few days there was a large area of ​​wilting dead trees, pulling out the wilting lettuce and finding the stem. The students had a piece of white hair. The use of streptomycin, can kill 3000 and other pesticides are not effective. The author came to his greenhouse, pulled out lettuce, and found that the base of the stem had decayed and had white pili. This was a typical case of Sclerotinia sclerotiorum.
Sclerotinia disease mainly harms the stem base. The diseased part of the disease was initially yellow-brown water-stained and gradually spread to the entire stem, causing it to rot or grow up along the leaves and causing rotting and rotten leaves. Finally, the plants died of wilting. When the humidity in the protected area is high, dense flocculent mycelium clusters are formed in the diseased area, and later become black fecal bacillus nucleus. Control measures:
1. Change the flat ridge cultivation to ridging cultivation. At present, vegetable growers grow lettuce in greenhouses mostly like open-air cultivation of lettuce, and they adopt flat-row cultivation. This causes poor ventilation and easy accumulation of water.
2. Clean the sick and rot leaves in time. The diseased plants were found to be cleared in time, and rotten leaves with pathogenic bacteria were buried deep in the soil to reduce the further infestation of pathogens.
3. Soil treatment. For greenhouses where lettuce is cultivated for many years, lime nitrogen blankets can be used to disinfect the soil at high temperatures during the high-temperature season.
4. Chemical control. Before planting, the seedbed was sprayed with 25% triadimefon WP 4000 times. At the early stage of disease, the diseased leaves of the diseased plants are promptly removed, and sprayed with 65% Tamycin WP 600 times, 50% Polymyxin WP 600 times, or 40% Sclerotin WP 1200 times. Basal base leaves.
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