The common diseases of the rich tree are root (stalk) rot and leaf blight.
First, root (stem) rot: This is a common disease that seriously harms the tree, also known as rot disease.
Control methods: (1) keep the cultivation environment dry, pay attention to the cultivation medium and the disinfection of the site; (2) after the semi-finished products are discharged into the operation shed, use the quick-kling to spray the head of the tree to prevent the damage of Botrytis cinerea. (3) Before planting, use a sharp knife to cut off the sprain and rot tissue at the top of the main root, and then spray the wound with the keeling, and then plant it after drying; (4) After one week of planting, the medium in the basin gradually dries and the healing tissue has formed. Xingen has begun to grow, using Plucker, Anke or Zinc Manganese (Radomir-manganese-zinc) to spray the tree of light, and it is better to flow the liquid along the pole into the basin.
After that, the fungicide is used once a week by Anke, carbendazim, Redolmir or Phytophthora; (5) If Pythium is active, use Plex, carbendazim, Redomal or Phytophthora Spraying, the general effect is about two weeks. If the weather is still not good, it must be sprayed with different chemicals to prevent drug resistance. If there is a ulcerated plant during the period, it should be discarded immediately.
Second, leaf blight:
Control methods: (1) The diseased leaves are found to be removed in time and destroyed;
(2) In the cultivation process of the rich tree, the conservation management should be strengthened, and watering and fertilization should be carried out in a timely manner. Each growing season can be applied with 2-3 times of foliar fertilizer, such as 0.5% potassium dihydrogen phosphate or double-effect micro-fertilizer. 200 times solution;
(3) Before the seedlings are transported from the south to the north, the leaf surface shall be sprayed with a protective fungicide, such as 70% chlorothalonil 800 times solution, or 18% calcium copper milk powder 200 times solution, or 50% bacteriostatic 600 times. After being transported to the north, the liquid should be planted in time to strengthen the management of fertilizer and water to prevent dehydration and de-fertilization. In the southern region, the cultivation of rich trees can start from the rainy season, spraying 50% carbendazim 800 times solution, or 70% chlorothalonil 800 times solution, and 75% methyl thiophanate 1500 times solution every 10-15 days. In addition, the main pests are the sugarcane moth, which is a new record in China, mainly because the larvae harm the rich tree, and can also harm the poinsettia, Fulutong, gooseberry, and Hawaiian coconut.
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