Symptoms: In the early stages of disease, round, dark green, water-soaked disease classes appear on the leaves. The lesions on stems become thinner and the two ends are immersed. The vines and branches and leaves above the diseased part first appear withered. The disease is rapidly expanding, and soon after the onset of the disease, the plant will suddenly wilt and die. Cut open the stem vines by hand, ah, will benefit from the cross-section of the vascular bundle white fungus concentration, the catheter generally does not change color, the roots have not seen rot. Control methods: Seed disinfection, use 300-times calcium hypochlorite to soak for 30-60 minutes, or 40% formalin-150-fold soak for 1.5 hours, or 1 million units of streptomycin sulfate 500-fold soak 2 hours, rinse Clean germination sowing. Chemical control: Before or at the beginning of onset, spray 77% copper suspension dry suspension 2000 times, or 50% methyl frost wettable powder 500 times, or 30% green suspension suspension 800 times, or 25% Only Itanone soluble powder 1500 times, or 72% of streptomycin-soluble powder of agricultural streak 4000 times, once every 5 to 7 days, 2 or 3 times in a row.
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