Rapeseed soft rot
Symptoms occur on mustard and cabbage rape in China. At the beginning of the stem or near the ground, the roots and stems of the stems develop water stains. Afterwards, they gradually expand, slightly sag, and the epidermis is slightly shrunken. In the later period, the cortex is easy to crack or peel, the internal soft rot is empty, and the plants are wilting. Severe diseased plants fell dead and died.
Pathogen Erwinia carotovora subsp. carotovora (Jones) Bergey et al. Carrot soft Erwinia carotovora caused by soft rot, a bacterium. The cells are short-stemmed, with 2-8 flagellates per week, no decidua, no spores, Gram-negative, colony-white, translucent, glossy, entire in broth culture. The growth and development temperature limit is 4-48°C, the optimum temperature is 27-30°C, the suitable pH is 5.3-9.2, and the neutrality is the most suitable.
Transmission route and disease conditions The disease is transmitted by soil and bacteria, from the wounds, cultivated flat, more pests, killer flow attack or high humidity, high temperature onset.
Control methods (1) 20 days before sowing, ploughing and sowing of soil, application of compost or fermented compost of organic fertilizer. (2) A reasonable understanding of the sowing time, the use of sorghum cultivation, to prevent freezing injury, reduce the wound. (3) In the early stage of spraying, spray 72% of agricultural streptomycin sulfate soluble powder 3000-4000 times or 47% of Garnett's wettable powder 900 times, 30% of green suspension suspension 500 times, 14% of ammonia Copper liquid agent 350 times, every 7-10 days 1 time, continuous prevention and treatment 2-3 times. Rapeseed is sensitive to copper preparations, and it is necessary to strictly control the dosage so as to prevent phytotoxicity.
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