Scientific Control of soft Rot of Chinese Cabbage

Chinese cabbage, Brassica napus of Cruciferae, originated in northern China, is a traditional vegetable in China. Chinese cabbage was first called song, but Isatis indigotica is not exactly today's cabbage. Modern cabbage is generally divided into cabbage and pakchoi. Northerners generally call cabbage "cabbage" and cabbage is called "rape".

Types of cabbage

Botanically, Chinese cabbage belongs to Brassica campestris subspecies of Cruciferae.

Chinese cabbage subspecies can be divided into four horticultural varieties, namely loose leaf cabbage variety, semi-heading Chinese cabbage variety, cauliflower cabbage variety and heading Chinese cabbage variety.

According to the cultivation center and ecology, the varieties of heading Chinese cabbage can be divided into three basic ecotypes, straight tube type, oval type and head type. Five secondary types were produced from three basic ecotypes: flat head straight cylinder type, flat head oval type, cylinder type, straight tube flower heart type and flower heart oval type.

In addition to ecotype, cabbage varieties can also be divided into different types according to leaf bulb characters and growth period.

According to the number and weight of globular leaves, it can be divided into heavy leaf type, leaf number type and intermediate type. According to the core form of the leaf ball, it can be divided into three types: closed heart, flower heart or turning heart, vertical center and semi-closed heart. According to the type of dome, it can be divided into flat head, round head and pointed head. According to the hugging mode of the blade in the ball, it can be divided into folding, folding, twisting and hugging types. According to the growth period, it can be divided into very precocious, precocious, middle and late maturing types.

Scientific Control of soft Rot of Chinese Cabbage

The bacterial soft rot of Chinese cabbage is also called "rotten pimple". The disease is a destructive disease, such as poor control and improper measures, it will bring great economic losses to vegetable farmers. So how to control the soft rot of Chinese cabbage scientifically?

Symptoms of soft rot of Chinese cabbage:

Most of the cabbage began to develop in the pericardium stage, and the diseased plant began to occur at the base of the petiole. at the beginning, the diseased part was water-immersed translucent, then expanded into grayish brown wet rot, the diseased tissue was sticky and slippery, and the surface sank after losing water, often overflowing with foul white bacterial pus and malodorous, sometimes causing pulp rot. At the initial stage of the disease, the outer leaves of the diseased plants drooped and wilted under the hot sun, but could recover sooner or later, and then could not be restored gradually. The outer leaves of the diseased plants were flat on the ground and the leaf balls were exposed. Some begin to rot from the outer leaf margin or bulb, and the diseased leaves become thin paper after drying. The diseased plant is easily kicked down. During the storage of Chinese cabbage, the disease continued to develop, resulting in rotten cellar.

Pathogen transmission and pathogenic conditions of soft rot of Chinese cabbage:

Pathogens overwintered on carriers such as diseased residue, soil, immature farm manure and out-of-season diseased plants, and became an important source of primary infection, and could cause damage between different hosts. Pathogens can be transmitted through many ways, such as Rain Water, irrigation water, fertilizer, soil, insects and so on. According to the results of the investigation, because the pests can carry pathogens in and out of the body, the pests eat leaves and cause a large number of wounds, which become an important channel for the pathogens to invade, so the pest has a serious field, and the soft rot is more likely to occur, such as the disease. the spread speed is also faster; high temperature and rain is conducive to the reproduction and spread of pathogens, and the occurrence of soft rot in cabbage after long drought is beneficial to the occurrence of soft rot, and the disease is also serious. The disease is also serious in the fields with long-term stagnant water and high soil water content.

Scientific control methods of soft rot of Chinese cabbage:

Disease-resistant and disease-tolerant varieties are generally selected with strong callus ability, tall tube type, upright type and green gang type, such as Beijing Xin 3, Jincai 3, Taiyuan Erqing and so on. Prevention and control of leaf-eating and borer pests such as cabbage moth, cabbage armyworm, beet armyworm, diamondback moth, cabbage borer, root maggot, yellow striped beetle, etc. in addition, diseases such as virus disease, downy mildew and black rot may aggravate the damage of soft rot. Therefore, we should do a good job in the prevention and control of these diseases. Do a good job of disinfection of pathogens, dig out the diseased plants in time, and disinfect them with lime in the acupoints.

Chemical control: seize the critical period, timely application of pesticides. After the cabbage is planted, 72% of agricultural streptomycin 3000 ml 4000 times solution or 20% Jinggangmycin water solvent, 25 grams of each bag and 50 kilograms of water can be used for spray prevention. You can also choose 45% Dysenamine 900 times liquid, 77% can kill 800 times wettable powder solution to spray. The medicament should be used alternately, spraying once every 7 seconds and 3 times in a row; spraying should be considerate, in addition to spraying in the whole field, it should also be sprayed to the petiole and stem base and root base near the ground, about 100 grams per tree, so that the liquid can flow into the heart of cabbage and seep into the root soil of cabbage.