Identification and Control of main Diseases of Orchid

Second, soft rot mostly 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, root rot often 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 found in the early stage, the pot should be changed quickly, all the plants 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 "promoting root growth" in clean water. Soak the orchid plant for 30 minutes and then dry it, replant it in the updated plant material and place it in a ventilated place.

Fourth, when the white silk disease is hot and humid, the mycelium of the bacteria first invades from the pseudobulb or the base, and then harms the root. 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 them from normal orchids that do not have the disease to prevent infection.

Fifth, sunburn in the lack of shading places, orchids were exposed to the strong summer sun, so that some of the chlorophyll in the mesophyll suffered from exposure and necrosis, and then was invaded by bacteria and pathological changes, the disease was mostly brown or black spots. Prevention and control methods focus on strengthening shade facilities, especially to prevent violent sun exposure at noon.

Sixth, the yellowing of orchid leaves or the dryness of leaf tips are not necessarily caused by bacteria, but mostly due to physiological phenomena caused by poor cultivation and management. This needs to be solved by improving water and fertilizer conditions, adjusting space temperature and humidity, regular ventilation and so on.