It mainly harms the stem base and reed head of plants. At the early stage of the disease, the roots and rhizomes were partially browned and rotted, and brown spindle-shaped lesions were produced at the base of the petiole, and gradually the leaves died and the rhizomes rotted. Prevention and control methods: Spraying 50% carbendazim wettable powder l 1000 times or 50% thiophanate-methyl wettable powder L 1000 times at the initial stage of the disease for prevention and control.
black spot
At the beginning of the disease, purple-black spots appeared on the leaves, and then they expanded into nearly round dark brown spots. Prevention and control methods: At the initial stage of the disease, spray 500 times of 65% zineb wettable powder or 50% thiophanate-methyl wettable powder 1000 times for prevention and control, and spray 1 time every 7 days for 3 times.
Spodoptera argentea
Larvae bite leaves, causing holes or nicks. Control method: spray 90% trichlorfon crystal 1000 times solution to kill.