Symptoms of root (stem) rot: Stem to root dark brown, rot, leaves lose vitality and wither. Control methods: (1) Ventilate in time to keep the cultivation environment dry. (2) Pay attention to the disinfection of cultivation substrates and flower pots. (3) After the transplant, remove the sprain and rot tissue at the top of the root, and then spray the wound with quick-drying, then dry it and plant it. (4) In the early stage of onset, the aerial part sprays 50% Tuzet WP 1000 times every 10 days, or 70% thiophanate-methyl WP 800 times, and the underground part uses 70% Mancozeb Zn wettability. The powder is watered 400 to 600 times 2 to 3 times. 5. If Pythium is active, it can be sprayed with Precise, carbendazim, and phytophthora. Symptoms of leaf blight: dark brown at the beginning, internal gray or dark brown lesions like sunburn, and black powder on long-term lesions. Control methods: (1) The diseased leaves were found to be removed in time and destroyed. (2) Strengthen the conservation and management, timely watering and fertilizing, and each stage of the growing season can be top dressing with 2 to 3 times foliar fertilizers, such as 0.5% potassium dihydrogen phosphate or 200 times double-effect micronutrient fertilizer. (3) 70% chlorothalonil WP 800 times or 50% WP WP 600 times or 50% carbendazim WP 800 times or 75% thiophanate-methyl wettable Powder 1500 times liquid.
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