1, leaf spot: the main damage to the leaves, the first small brown spots, lesions were round or irregular shape, the late central gray to gray, red-brown edges, lesions on the black gray mold. High temperature and high humidity are often the cause of morbidity. They are transmitted through wind and rain, and are infested. The condition deteriorates after October. Prevention: 1 pruning to remove diseased leaves and removing diseased leaves in winter, concentrated burning; in early 25th, spraying 1:2: 100-200 Bordeaux mixture, after spraying 50% benzene to 1000-1500 times or 500 times Or 70% thiophanate-methyl 1000 times. 2. Leaf spot disease: The leaves suffer more from the tips of the leaves and leaves, and the spots are light brown. After expanding into a round or irregular shape, the lesions can be linked to each other by 1/3 to 1/2 of the leaves. The edge is green, and black spots appear on the late lesions. High temperature, high humidity, poor ventilation, poor plant growth, the incidence of heavier, usually from July to November, the incidence of wind and rain. Prevention: 1 At the beginning of the disease, spray 65% ​​of dexamethasone 500 times or 1:2:200 Bordeaux mixture; 2 can be sprayed with 50% carbendazim WP 800 to 1000 times or 50% phenylet wettable Powder 1000 to 1500 times liquid. 3, moth: green or yellow-green, topline white, the most likely to occur in the back of the leaves, feeding leaves, leaving the cortex. Before loosening the larvae, the soil around the tree trunks can be loosened to lure the larvae to concentrate and then to eliminate. Or use spores of more than 10 billion billion / ml Bt emulsion 500 to 800 times spray, in addition can also be 2.5% of deltamethrin EC or 20% geraniol EC 3000 times spray. 4. Scale insects: 2 to 3 generations can occur in the Yangtze River valley. The severe damage is from May to June and from August to September. The hi set lives on the main tip and branches, or on the branches and leaves, and the nymphs secrete honey. Dew has caused the coal pollution of flowers and trees to occur. High temperature and high humidity are favorable to occur. When a small amount occurs, it can be softly brushed with a soft brush to achieve good results. In the summer, it is most advantageous to spray with 0.3 to 0.5 Baume degree lime sulfur, or 50% of monocrotophos EC 1500 times, spray alone or in combination, spray once every 7 to 10 days, and spray 2 to 3 times. 5. Starscream: High temperature and drought conditions often occur. Control methods: When the weather is dry, attention should be paid to irrigation and combined with fertilization to promote plant robustness and enhance insect resistance. In the use of chemical pesticides, pay attention to frequent rotation, because it will produce resistance after applying certain highly toxic pesticides. Can be used 40% chrysanthemum EC 2000 to 3000 times or 40% dimethoate EC 1500 times spray, with good control effect. PE Coated SMS,PP Non Woven Fabric,Spunbond Non Woven Fabric,Waterproof Polyester Fabric XINLE HUABAO MEDICAL PRODUCTS CO.,LTD. , https://www.golbaltravel.com