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Orchid common disease prevention
1. Diseases caused by Phytophthora infestans occur throughout the year, but during the rainy season, when watering is too humid or poorly ventilated, the disease is the most severe. Especially the seedlings that have just been bottled are the most vulnerable. Brown lesions were found at the site of infection, rapidly enlarged at high temperatures and humidity, and finally presented with dark brown spots. Dead leaves rotted until the plants died. Prevention methods: (1) avoid excessive humidity, improve ventilation and ventilation conditions, adequate light (2) avoid partial use of nitrogen fertilizer, reduce plant weakness and weakness (3) spray 1/800 more bacteria or 1/1000 water solution (4 The diseased wounds were smeared with large powder and then placed in a dry place without watering for a week to prevent the spread of the disease. 2. Anthrax illness: Planted too densely, poorly ventilated, watery or injured wounds and other susceptible diseases. At the beginning of the disease, the leaves produce brown depressions, which later expand into round or irregular lesions. In severe cases, there is gangrene in the center of the lesions. Control methods: (1) Do not grow too densely. Increase lighting; Drainage, ventilation need to be good (2) Train strong seedlings, do not often move plants, so as not to cause damage and disease (3) Cut off diseased leaves, with 1/500 times Greater Health -45 water, 1/800 times Wanqingqing Smeared Wound (4) 1/1000x Thiophanate-methyl or Verbendrillate Perfusion once a Week 3. Soft Rot Diseases: High temperature and humidity in spring and summer, poor ventilation, and excessive application of nitrogen fertilizer This disease. In the early stage, bacteria invaded the leaves or the heart of the leaves to produce water-stained lesions, which rapidly expanded, contained more water, and later developed odor. The diseased leaves turned yellow and fell off, and the whole plant died of soft rot. The disease is extremely infectious and must be prevented and treated as soon as possible. Control methods: (1) Improve growth conditions, increase ventilation, reduce temperature and humidity (2) Remove sensitive parts, smear with antibiotic powder, not watering for a week, can stop the spread of the disease (3) use streptomycin 1000 times water Liquid, lime sulfur or Bordeaux 500 times the water, spraying once a week 4, leaf blight illness: leaf shoots produce black spots, gradually expanded into irregular lesions, the lesion formed a dark brown edge, the middle was light gray Brown, when severe, spreads over the entire leaf and finally wither leaves. Control methods: (1) Remove diseased leaves and spray 500 times of big students - 45 or 1000 times of good creatures (2) Sensitive plants, should avoid rain or stop watering, prevent exacerbations (3) Spray once a day 500 times Tai Sang-45, for prevention 5, disease of the white peony disease: Cymbidium grandiflora is more prone to the disease, the initial pseudo-bulb base becomes black and rot, gradually produces white hyphae on the lesion, the diseased plant gradually withered and died. . Control methods: (1) Remove the pseudobulbs with lesions, together with the planted pots and plant materials with fire (2) Spray 500 times of Taisheng-45 fluid once a week or 1000 times of water solution of carbendazim.