Shepherd's lettuce is a white matter
In winter, the humidity in the shed is high, and the ventilation is poor. The disease of lettuce is more common than the disease in the open land. Prevention of disease has become a major problem. Foot and leg massager Foot and leg massager Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizonscares.com
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. Some people say that it is a bacterial soft rot disease, and streptomycin can be used to kill 3000 pesticides and other effects 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 (see photo). This is a typical case of Sclerotinia disease.
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.