In the initial stage of root rot, brown irregular spots were formed at the base of vines, and the spots expanded to form dark brown long lesions. In the middle of the lesions, the bases of the vines shrank and the vines died. Observe the surface of the lesion, often indistinct light brown filamentous mold. The onset of tuber often results in the formation of brown irregular lesions near the terminal buds. If the roots are affected, it can cause root death. Through the spread of soil, rainwater, and fertilisers with pathogens, it is easy to attack under conditions of high temperature and high humidity, and the disease is light when drought occurs, and the incidence is heavy when the water is deposited in the field or in the field.
The prevention and treatment of the disease can be used 50% sterilization Star 1000 times, or 75% chlorothalonil wettable powder 600 times, or 53.8% can kill 2000 dry suspension 1000 times, or 50% Fumei double powder 500-600 Double fluid. Focus on the lower part of the spray Ma yam, spray once every 7-10 days, even spray 2-3 times.
YT-T11
YT-T11
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