What diseases should be prevented in orchid culture?

What diseases should be prevented in orchid culture? Please guide orchid culture to prevent and control more diseases, the following detailed list for your reference: first, orchid anthracnose: also known as brown spot, mainly harmful to orchid leaves. Its symptom is the appearance of oval disease spot on the leaf surface, from small to large, from yellow to black, and even rotten in severe cases. Most of them occur in the rainy season, when the humidity is more than 80%, and the disease is at its peak when it is hot and muggy. When found, immediately cut off the diseased leaves, focus on burning, clean up the surrounding environmental hygiene, strengthen ventilation, reduce humidity, and then spray with 800 times of carbendazim or 600 times of anthrax. Spraying once every 10-15 days, 2-3 times in a row, can have an inhibitory effect. Second, the soft rot of orchids usually occurs from April to May. As a result of Rain Water carrying bacteria into the young heart, there are small spots like water stains, from brown to black, and even stink and die. When it occurs, it should be moved to a place with less ventilation and less humidity, and the moisture of the bud core should be sucked out with cotton wool, and sprayed with 1% Bordeaux solution or 500 times chlorothalonil solution, once every 10 to 15 days, several times in a row. Third, orchid root rot occurs when it is hot and humid. When the basin soil waterlogging, soil consolidation, acidity is more, fertilization is too dense, Fusarium take advantage of the opportunity to invade the root, make the root gradually rot, the plant can not absorb nutrients and die. If it is found in the early stage, the pot should be changed quickly, all the plant materials should be poured out, the rotten roots and leaves should be cut off, the whole orchid should be soaked in 0.1% potassium permanganate solution for about 15 minutes, washed and dried, and then diluted 3000 times with clean water with "promoting root growth". After soaking the orchid plant for 30 minutes, it should be replanted in the updated plant material and placed in a ventilated place. Fourth, orchid white silk disease: when the season is hot and humid, the mycelium of the bacteria first invades from the pseudobulb or base, and then harms the roots. After the occurrence of the disease, the leaves gradually yellowed and withered from bottom to top, and the white silk-like bundles on the surface slowly extended to the whole plant. All the Langen infected with the disease would be empty in the middle, leaving only fibrous tissue, showing the phenomenon of dry death of broken leaves and broken roots. To prevent the occurrence of white silk disease, clean and sterilized plant materials should be selected before planting, and excessive organic matter fertilizer should not be used. Soak the diseased plants with 600x solution of chlorothalonil for 20 minutes, then wash them with clean water to dry, soak them with 3000 times diluted water for 20 minutes, replant them and put them in other places to isolate from normal orchids that do not have the disease to prevent infection. Fifth, orchid sunburn disease: in places where there is a lack of shading, orchids are exposed to the strong sun in summer, so that some chlorophyll in the mesophyll is exposed and necrotic, and then it is invaded by bacteria and pathological changes occur, and most of the symptoms are brown or black spots. Prevention and control methods focus on strengthening shade facilities, especially to prevent violent sun exposure at noon. Sixth, orchid leaves yellowing or leaf tip dry: not necessarily caused by bacteria, mostly due to poor cultivation and management of physiological phenomena. This needs to be solved by improving water and fertilizer conditions, adjusting space temperature and humidity, regular ventilation and so on. Click to get more orchid planting techniques click to get more flower planting techniques