Etiology and prevention of soft rot in orchids

Etiology and prevention of soft rot in orchids

Reason 1: the application of hormones, especially the application of bud-promoting hormones, leads to multiple emergence of seedlings, early accumulation of nutrients, malnutrition is not obvious, seedling consumption is large, and the stored nutrients are exhausted in advance. the nutrients here do not refer to things such as grain or general protein, but mainly trace elements. The new seedlings can not be balanced by absorbing trace elements by new roots, and the low level of trace elements leads to the decrease of machine resistance. Some vaccines even if they do not use hormones, many resale vaccines are used, there is already a hidden danger, or this kind of vaccine itself has a lower immunity.

Second: uneven dry and wet, too hot and cold. The air is dry and the basin is waterlogged; the basin temperature in summer and autumn is too high, when the pores of roots and leaves are like people sweating and panting, watering is like people sweating to take a cold bath, waterborne bacteria and other dry matter drive straight into the basin, which is very easy to induce diseases. When the root is stimulated, the pores suddenly close, and the metabolic waste stored in it accumulates, which induces pathological changes. On the balcony one side receives the light and the shade bad orchid basin, one side is hot, one side is cool, the orchid plant is at a loss as a whole, also easy to suffer from the disease.

Third, excessive fertilizer, especially nitrogen fertilizer. Wait.

About prevention:

First: soft rot bacteria are transmitted through wounds, so it is important to avoid mechanical damage to orchid plants. Attention should be paid to cross-infection caused by disinfection of utensils during pruning and ramet.

Second: according to data, soft rot is a bacterial disease, and it is not effective to use topiramate antifungal drugs in prevention. Antibacterials such as chlorothalonil should be used. According to reports, Bordeaux liquid is one of the most effective drugs to control this disease and other orchid diseases.

Three: according to data, soft rot is a symptom, and there are several kinds of bacteria that cause this symptom. If it is caused by tillering rot bacteria, attention should be paid to adjusting the pH in the basin to inhibit it. If this bacteria is caused by basophilic and rot bacteria, attention should be paid to regulating the pH in the basin to inhibit it. This bacteria is basophilic and should be slightly acidic in basin soil.

Fourth, avoid sudden changes in temperature and uneven heating on both sides of the basin.

Fifth: control the temperature in the basin and maintain the appropriate air temperature. Both should be moist rather than wet.

Six: after the onset of the disease, different seedlings were treated differently. Weak seedlings can consider conservative therapy, that is, mainly by controlling the humidity in the basin to inhibit the disease, do not turn the basin. Wait for a chance to turn the basin after the weather is cool. Because the disease usually occurs when the temperature is high, surgery is not necessarily a good thing for weak seedlings. Zhuangmiao can consider turning the basin, remember to clean up the brown lesions, do not take chances. It is said that it is effective to smear the affected area with Dakonine. You can try it.

Seven: do not rush to medical treatment, indiscriminate use of drugs against victimization.

Eight: the orchid strain after ramets must be disinfected. If the seeds are disinfected and dried, you can pour fixed root water, and the undried roots are still very fresh, that is, do not rush to pour fixed root water. New orchids should be kept in a cool and ventilated place for 10 days, not in a hurry to bask in the sun, especially on the side of the ramet wound.

Nine: experience introduces that the ramet is not divided into pots or twisted on the wide road of the orchid plant to stimulate germination, it should be noted that not all orchids are suitable to do so, the first condition is that your orchid garden does not have tillering rot bacteria, and the second is that you cannot water it right away, otherwise the germs will take advantage of it. Instead, it suffers.

Soft rot infection on the old seedling is slow, and it is not easy to detect when the plant is well ventilated, the temperature and humidity is low, and the plant is strong, as if it is not latent. At this time, we should not take it lightly, and we should pay attention to regular spray prevention, otherwise it may break out in the event of high temperature, high humidity and prosperous growth of new seedlings. It's too late.

Http://www.dfac.cc/showtopic-17-300555-0-0-1.htm is extracted from the famous Collection of Yilan.