Prevention and treatment of orchid disease before potting

Before putting on the pot, do a good job of disinfecting seedlings, soil and pots, loosening and aerating plant materials, not waterlogging, strengthening management, reasonable fertilization, so as to enhance disease resistance. If you find the disease, use medicine to prevent and cure it immediately. Bordeaux liquid, conazole, chlorothalonil and other pesticides can be used to spray, and the effect is good.

White silk disease: White silk disease pathogen overwinters on soil and diseased plants, between spring and summer, plum rain season, autumn rain season, poor ventilation, lack of light, when the plant material is acidic, the disease is particularly serious, white mycelium disease spot appears on the stem of the diseased plant, and the disease spot gradually extends to the whole plant, causing corm rot, resulting in leaf yellowing and death, rapid infection and great damage.

First of all, to improve the above-mentioned causes of disease, and secondly, in the early stage of the disease, timely basin covering, disinfection of diseased plants, and treatment of irreparable diseased plants. After using aseptic plant material and pelvis, sprinkle quicklime or freshly roasted plant ash on the basin surface to reconcile the pH, make the soil neutral and slightly alkaline, inhibit and kill the growth of bacteria, and prevent the recurrence of bacteria.

I once found three cases of white silk disease of Jianlan (big leaf white) in Lanyou. One case found two pots of Jianlan for sale in the flower shop, from the bulb to the leaf tip was covered with white hyphae, the white silk disease was extremely serious, I suggested him to deal with it, otherwise, it spread to other orchids and flowers. In one case, white silk disease was also found in Lan Youjia. I put forward a treatment method: cover the basin, soak the plant in water with newly roasted plant ash to disinfect the plant, soak the plant in the plant ash solution for 20 minutes, and the concentration should be high (no proportion at that time. Two bowls of plant ash were stirred in a washbasin water), take out and air, and sprinkle a layer of plant ash on the basin surface with aseptic plant material and basin, and the effect is obvious after treatment. There was no relapse. In one case, Jian Lan was found to have white silk disease in Lanyou's home. I suggested how to deal with it. I sprayed sterilization with Bordeaux solution of 1V, and sprinkled quicklime on the basin surface. Without covering the basin, the effect was good and there was no relapse. (Chen Jisheng)