Fight against White Silk Disease

Orchid mycosis, also known as white silk disease, is a fungal pathogen, the main pathogen is Penicillium spp. At first, white hyphae were produced in the soil and the corms of orchids, then gradually spread around, and then the mycelia were entangled together to form millet brown or blue sclerotia. The corm part of the killed orchid is waterlogged, rotten and soft, and is easy to break. Two to three days after the onset of the disease, the white mycelium grows all over the orchid basin, which can make the whole pot of bluegrass rot and die. it is a deadly and harmful bacteria. The main time of onset is from June to July.

In the past, I often heard seniors say that white silk disease was terrible, so I was always paying attention to it. I had not found it for several years, so I was a little relaxed. On August 3rd, the temperature was 32 ℃ in the morning, resting, watering thoroughly, inspecting every pot of grass, I didn't find anything unusual, and they all grew well, proud, and in a good mood, so I went out to the teacher's shop to talk about flowers. On the morning of August 4, the temperature was 32 ℃, and it was watered thoroughly. During the inspection, I found that there was an abnormal basin of spring sword noodles that went down the mountain around November last year. When I took a look at the place with strong light, I screamed, "Oh, no!" The basin is covered with terrifying white mycelium, white silk disease! I got white silk in my grass and got sick! Here comes the wolf at last (figure 1). Gently lift the new seedling with your hand, the bulbs have all rotted and become mushy objects, fall down as soon as you touch them, and the color of the wound is light blue (figure 4). After smelling the wound of the new seedling, there was a smell of mushroom. fortunately, it was the first time to get sick. After pouring out the basin, I found that the bulb of bluegrass was full of white hyphae (figure 2, figure 3). So only the surface plant material has such hyphae, the deep layer has not yet developed, hurry to think of the rule of law, see if it can be saved. So they pulled out the rotten seedlings, removed all the dead leaf beetles, removed the rotten roots, rinsed hard under the faucet, and dug up all the rotten substances. Only then did I find that the corms of some old grasses had been "gnawed" off half by the mycelium, revealing horrible wounds. I don't know if there's any cure.

After rinsing clean, put it in the cool place (it is really too hot here, after noon, there are about 34 ℃ in the shade). Before going to work in the afternoon, the water evaporates completely and the root has become soft, so take out methyl topiramate and mix it into a potion with a concentration of about 800. soak the grass inside and take it out to dry again when you get home from work. The next day, that is, on the morning of August 5, take out the new basin and take the new plant material (the previous plant material was exposed in the sun, killed the germs and thrown away, and the basin should be disinfected again after a few days). Add one kilogram of copper preparation to water, just like watering through, from the leaf to the root, after pouring all one kilogram of water, put it in the shade, no longer watering, and only after three days of dry cultivation, it is mixed with other grasses. Normal management, so far, there is no sign of recurrence of the disease.

Analysis of the reasons, I used high-waisted pottery basin, large granular soil planting, coupled with August, the temperature is as high as 37.8 ℃, should not be the onset period of white silk disease, may be placed in a relatively cool place, in addition, the grass came down the mountain with some other grass last year, the cold water is cold, it is estimated that it was too careless in pruning and washing (the water is too cold, frozen hands ah), some withered leaf beetles were not removed. The "seed" of white silk disease may be hidden inside, although it has also been disinfected and sterilized, but there are still bacteria that leak from the net. In addition, when the place was placed in a cool place, the white silk mycelium grew crazily. When the pot grass was cleaned, it was found that the most white silk mycelium was in the corm part of the old grass, and many mycelia were also found when the leaf nail was torn open. As the resistance of the old grass is much stronger than that of the new seedlings, white silk disease has not yet "gnawed" all the old grass, and in two days, the pot of grass will be wiped out. But this year's new grass has been raised for nothing, and there are no seedlings left.

Remind the orchid friends that the white silk hyphae are easy to be found on the bluegrass downhill, rinse and disinfect the mycelia in time after discovery, and pay attention to washing the hyphae in the leaf beetle. In the season with high incidence of white silk disease, pay more attention to observation and solve the problem in time. Serious illness should be treated with fierce medicine, so the concentration of the drug can be the highest concentration that bluegrass can bear, and the soaking time should be prolonged. In addition, the white silk disease found no sign of contagion between the two pots, unless the mycelium was washed into other flowerpots when flushing the water, or the two pots were so close that the pots were even close to each other and ignored it. The fungus grew full and crawled across the pot (this has happened, and the orchid farmer has been a little dereliction of duty). The orchid grass placed around my diseased grass grew well, and no white silk was found. however, to be on the safe side, all the bluegrass in the orchid shed was used with a fungicide, after all, it had a greater impulse when it was watered through. in case the mycelium leaking into other pots, you won't be able to cry.

Only after this "war" can we have a preliminary understanding of white silk disease, and the lesson is profound and worthwhile. I hope that the majority of orchid friends will also be more vigilant. Strictly do a good job in disinfection and sterilization of downhill grass to prevent more severe bacteria from infecting bluegrass. Extracted from "Orchid Treasure Dian" Chongqing Qinghong