It is now the critical season for the onset of onion soft rot. According to the occurrence rule of onion soft rot, epidemic conditions, hazard characteristics and many years of research data, the following prevention and control measures are proposed for the majority of farmers to learn from and reference applications.
First, the prevention and treatment (1) seedling preparation nursery selection of disease-resistant varieties nursery, eliminate diseased and weak seedlings, seedlings and healthy seedlings. (2) Choosing the mouth to choose the ventilation and light-transmitting plots, corn, wheat and other relatively good pre-tanning, avoid the use of heavy taro, carrot clams, and garlic and other Liliaceae vegetables mouthwash, try to avoid the autumn cabbage, artichokes, etc. are likely to cause soil disease residues The mouthwash. (3) The cultivation of high-riding and conditional areas advocates the implementation of ridge cultivation. Onion colonization on sorghum can reduce flooding and reduce the chance of pathogenic infection. (4) Strengthening field management Timely cultivating and weeding, raising ground temperature, and promoting onion development are conducive to onion populations resisting invasive infections of soft rot pathogens.
Second, the growth phase of prevention and control (1) active pest control in time to prevent onion root lice, thrips and other pests, to reduce the insect infection due to wound and soft rot infection. (2) Reasonably watering to avoid flooding and string irrigation to reduce the spread of pathogenic bacteria with the flow of water in the field. (3) chemical control in early July, often to the field inspection, found that the central diseased plants in a timely manner partial irrigate seedling spray, while the whole field spray prevention, can be preferred 72% of agricultural streptomycin 5,000 times + 30,000 times for animal penicillin, can be killed 2000500 ~ 600 times liquid + 72% of agricultural streptomycin soluble powder 4000 times liquid spray control, spray once every other week, continuous spray 3 times.
Third, the late prevention and control of onions residues in the field burned.
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