Symptoms usually start from the wound of the plant stem base, infiltrated translucent at the beginning, after the disease expanded into an irregular gray brown wet rot, which exuded mucopurulent pus, and emit bad odor . The disease department rapidly expands upwards along the base, causing the entire vegetable ball to rot. Sometimes the disease can also start to rot from the outer leaf margin and the top of the leaf ball.
Pathogen? This disease is caused by the infection of the Erwinia Carotovora subsp. carotovora (Jones) Bergey et al. The pathogenic bacteria are the same as the cabbage rot.
Characteristics of the disease? The pathogens mainly live with the sick tissue and live in the soil. They are spread by rainwater splashing, farmland manure, agricultural implements, and small insects. They invade from the wounds and often cause crop failure, low-lying land, Poor drainage, or the use of soil fertilizers that are not adequately decomposed and easy to develop? Flood irrigation or string irrigation will accelerate the spread of the disease. There are differences in resistance between varieties. Soft-tailed lettuce from Guangdong (alias Shandong lettuce, loose-leaved lettuce) is susceptible to soft rot when wet; Caesar (day lead, very early maturation), avant-garde 75 (citation), green wave (day lead), and malay (External induction, precocity) is more resistant than disease, but it can be tested according to local conditions.
Control methods
1. Disease resistant varieties should be selected for soft-rot cultivars or plots.
2, do a good job in the pastoral clean, plowing the sun, irrigation and drainage system, sorghum deep trench cultivation, the implementation of formula fertilization, reasonable dense planting, should not be flood irrigation string irrigation.
3, timely application of insect control Bo Bo attention to the prevention of underground pests (50% phoxim 1 000 times showering), from the heart began to strengthen inspections, found that the disease was immediately removed and properly handled, spray blocking the disease center . Drugs can be used "Feng Ling" 300 to 500 times liquid, or chloramphenicol, streptomycin, neomycin and 500 times each of the new liquid, 2 or 3 times, every 10 to 15 days 1, spray evenly. Spraying 77% can also have a certain effect. You can also try 70% quinacridone wet powder 1 000 to 1 500 times spraying or showering.
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