Controlling Methods of Black Rot of Cabbage

Most black rot can damage cruciferous crops such as Chinese cabbage, cabbage, cauliflower, radish, mustard and turnip, so such disease can bring cultivators more losses. Here are some methods to control the black rot.
Symptoms
Black rot is a bacterial disease caused by vascular disease. Its symptoms characteristics is the cause of vascular necrosis darken. Seedling disease has cotyledons or spread to gradually withered leaves, and continues to develop, the leaves small emerging or black. Stubbing more from the lower leaves incidence, or make more use of pest leaf margin, a "V"-shaped yellow spots, a black vein necrosis, bacteria can spread to the petiole along the vein stem and roots, which stems Department of Vascular black roots, a stock work, plants withered leaves.
Pathogen
Germs for the growth and development of 25 - 35 degrees Celsius, the lowest 5 degrees Celsius, the highest 38 - 39 degrees Celsius, and lethal temperature was 51 degrees Celsius continued for 10 minutes. It is resistant to dryness.
Cause
Disease occurs in the spring and autumn and spring light incidence, morbidity heavy autumn. High temperatures fall, the incidence wet weight.
Cultivation misuse grievances, water incidence easy. Fertilization improper watering, but also easily infected.
Transmission
Cotyledon bacteria from the pores into the leaf edge, and mature leaf edge more from the water hole and wound into bundles and then expand from top to bottom, causing the whole system disseminated. In the fields with more rain, pesticides, insects, fertilizer, agricultural activities spread.
Watering, pruning the inadvertent humidity, spread.
Preventive Measures
(1), agricultural control
Choose fine varieties, which are resistant to black rot.
Election topography, good drainage of the block.
For 2 - 3, and non-cruciferous crop rotation inverted crop.
Timely uprooting plants found burned deep.
Rationally cultivating, strengthen management after colonization, appropriate fertilization, watering and improve plant resistance.
(2) Chemical Prevention
1. seed disinfection: 50 degrees Celsius warm water soaking for about 20 - 30 minutes, or 50％ o ammonium for 15 minutes, or 0.4 percent more than the United States mixed blessing, dry cleaned after planting .
2. 1:1 200 Bordeaux mixture solutions and spray in the early stage.