Control methods of black rot of mustard

Mustard can be pickled or made into mustard seeds, and the whole plant can be used as medicine, which has a certain economic value. Planting mustard is generally rare, but it should not be taken lightly. Black rot of mustard occurs frequently, and germs can survive in a variety of environments. Therefore, we should pay attention to it, and then we will briefly introduce the prevention and control of black rot.

Symptoms of the disease

It mainly harms the leaves, but the whole plant can get sick, usually invading from the wound or the tender part. After the injury, the yellow disease spot generally appears from the edge of the leaf, and gradually spreads like the inner part, and the bacteria will spread along the vein of the leaf to the stem to form a brown spot. The leaves will eventually form a dry rot, but the stems may rot and fall off, and eventually become dry.

Second, the cause of infection

Flourish in high temperature and humidity environment, low temperature below 5 degrees will die, resistant to high temperature. The initial infection may be carried by the seed, or it may be that the selected planting field has been infected before. Germs can survive in the soil for several years and continue to do harm. Generally, it can be spread with the help of irrigation water, wind, and agricultural operations. If the residual water on the leaf surface is easy to be infected after heavy rain. Can spend the winter in sick and disabled bodies and soil.

III. Key points of prevention and control

1. Selection of species and sites

Select disease-resistant varieties, select varieties with less water demand and drought tolerance, and select varieties that adapt to high temperature and rainy weather. General selection of land that has not previously planted black rot susceptible host plants or land that has not occurred black rot, it is best not to plant the same susceptible plants around.

two。 Cultivation and management

It can be sowed early to avoid high temperature and rainy weather in summer, and seedling refinement should be carried out when transplanting to enhance disease resistance and adaptability. Timely drainage after rain, drought timely watering after the decrease of soil temperature. Irrigation only needs to be kept dry and wet, not too wet.

3. Seed dressing with medicament

Before sowing, stir in 50 degrees hot water for 10 minutes to sterilize, drain and soak the seeds with 45% Dysenamine 300 times solution for half an hour to sterilize and disinfect, dry and then sow to avoid carrying bacteria. In the early stage of the disease, timely medication is generally sprayed with 72% agricultural streptomycin sulfate soluble powder 4000 times, twice in a row, once every three days. If the spread is not controlled, it is necessary to remove seriously diseased plants or even change soil in time, and then change 15% mixed amino acid copper, zinc, manganese and magnesium solution 300,500 times or 50% chlorobromoisocyanuric acid soluble powder 1500 times to prevent and cure.

When the black rot occurs before the prevention work, can minimize the possibility of the disease, and then at the beginning of the disease should be timely control to prevent the spread. If we do these well, we can prevent the occurrence of diseases in a large area.