The most common diseases of spring rapeseed rapeseed are sclerotinia, downy mildew and black rot. In the prevention and treatment of diseases, the old leaf disease leaves should be removed in time, and pesticides can be used for prevention and control when the disease leaf rate reaches more than 10%.
Control technology
1. Choose disease-resistant varieties and seed treatment.
The tailoring method uses the cabbage-type hybrid disease-resistant Fengdeng seed, which is the most economical and useful method of disease prevention. Before cultivating, you can choose to remove the sclerotia and the sclerotium mixed in the seed by selecting and slipping.
2. Reasonable rotation.
The selection of crop rotation is one of the primary methods to prevent and cure Sclerotinia sclerotiorum and downy mildew. The method is to carry out rice, rapeseed rotation or cultivation with grass crops such as wheat and barley, which can significantly reduce the onset of disease.
3, scratching the seedling stage to cure disease.
Aphids are the mediators of rapeseed virus disease, while rapeseed wheat seedlings are most susceptible to viral diseases, preventing rapeseed wheat seedlings from being very resistant to disease. Before the rapeseed is not cultivated, the mites on other hosts should be treated once to eliminate the mediators. Before rapeseed is transplanted, it is necessary to check the insects frequently. When aphids are found, they should be immediately controlled. Commonly used agents are: 50% anti-converse 20 grams per 667 square meters, or 48% 48% lesbian cream, 50 kg regular spray on water.
4. Strengthen management and management.
1 Select the seedbed and cultivate strong seedlings. Before the selection, it was used as a seedbed for non-cruciferous vegetable fields and away from cruciferous vegetables, and weeded the weeds around the fields. Cultivate in a timely manner, strengthen handling, and cultivate strong seedlings.
2 eliminate the source of bacteria. Before cultivating, it is necessary to deepen the land, bury the sclerotia deep, and combine the cultivating and cultivating soil to damage the ascending sac in early spring. Combined with the seedbed, the diseased seedlings and the bad seedlings are removed. The rapeseed leaves the old yellow disease leaves before flowering and takes out the field for collection.
3 Rationally apply fertilizer, apply enough base fertilizer, increase phosphorus and potassium fertilizer, and enhance plant disease resistance.
4 deep ditch sorghum, reasonable close planting. When there is too much rain, the ditch will be drained in time to reduce the humidity in the field, so that the plant grows stronger and strengthens the disease resistance.
5 According to the actual situation of boron deficiency in the soil, spray borax or boric acid 1-2 times in the seedbed and Honda. It can be used to treat "atrophy and disease" caused by lack of boron, "flowers and diseases."
5, chemical control.
In the early stage of the disease, especially when rapeseed enters the stage of convulsion and flowering, it is necessary to apply the drug in time to control the expansion damage of diseases such as sclerotinia, downy mildew and white rust. When it rains, you should spray the spray and add the number of sprays.
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