Most of August-September are high temperature and high humidity, and yam is susceptible to bacterial invasion. If the growth environment is poor or improper management, it will easily lead to a large drop in output and poor quality. Control methods:
First, eliminate the source of the virus
Planting plots should be selected for plots of yellow or brown sandy soil that have not been planted with yams for more than three years. In the first year of yam, it is necessary to grow rice. In winter, wheat, barley and other grass crops must not be planted, and rapeseed and cabbage broad-leaved vegetables must not be planted. This way, the yam has a good growth environment because there are few viruses in the field.
In addition, to choose Huang Liang, no spots of yam as a species, cutting wounds painted with wood ash sterilization. The environment is good and the species is good. The yam can grow naturally.
Second, scientific management
Yam hi dry, afraid of waterlogging, so the cultivation should be narrow box deep trench, box width of about 1 meter, ditch depth 20-35 cm. Weeding herbicides can be used, after the harvest of the former crop, weeding with "paraquat", after every 10-15 days after the rain, spray a "acetochlor", "Lasso" and other pre-emergent herbicides. Practice has proved that too much blistering soil, yam water will die. After the end of August, the fungicide, a fungicide, was sprayed every two weeks or so in fine weather after rain. It can be controlled 3-4 times using the American-made “Manson Manganese Zinc†+ Japan’s “Methane-Tropoxineâ€.
If it does not rain for a long time, the tubers of yam will grow poorly due to lack of water. You can fill half of the ditch water in the middle of the night or in cold water in the morning, so that the car is moistened with 80% of the car's surface. Do not pour water at hot noon during the hot day, otherwise the yam will cause Can not stand the cold and hot changes caused by physiological disorders and leaves vines.
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