Orchid Cancer-- the Origin and Prevention of Bellas virus

Plant diseases caused by virus infection are called virus, disease, or toxin disease, which is called "VIRUS" in English and transliterated as Ballas. According to the literature in Hualien District of Taiwan, there are at least 25 kinds of viruses infecting orchids, belonging to 9 virus groups. Among the three most common viruses, national orchid mosaic virus, national orchid ringspot virus and orchid small spot virus. The disease is an incurable virus in the near future, and contains transmission, heredity, orchid friends called orchid "cancer" and "AIDS".

After the orchid strain is infected with the virus, it causes systemic infection, which causes the orchid plant to grow slowly, leaves with spots or irregular sunken yellow discoloured patches, and sometimes gangrenous spots. Generally, it often occurs at the base, middle or end of the leaf, showing milky white length and thickness, different states and irregular boundaries, the boundary of the spot is often like a gradually diffused water stain, and both sides of the spot are green-like and transparent. There are no different color spots in the early stage, and there is a concave feeling on the back of the middle stage, including a little light brown, middle spot, late color deepening such as sunburn, wrinkle lines at the same time, the edge of the leaf curls and loses its luster, then gradually dried up and finally died.

The terrible Bellas virus is contagious and can be passed on to the next generation of orchid strains. Although it does not get sick in time, it is like early cancer. Some famous orchid farmers inadvertently introduced diseased seedlings, and in less than two years, orchid seedlings became blossomed, and the scene was terrible. This year, some orchid households in Guangdong and Sichuan caused losses, ranging from hundreds of thousands to millions. It is really "good work for three years, killing for a quarter of an hour", the insect bites, crawls, potted utensils, substrates and leaves are squeezed, and orchid seedlings are displayed, stacked, transported and soaked in water. The reuse of old plant materials may spread Bailas virus, especially when the plants are changed in spring and autumn, the knives used, such as scissors, must contain the sap of infected orchids when cutting diseased orchid seedlings, and when the knives cut other orchid seedlings again, the virus originally stained on the tools can spread to the cells through the wound, and knives are frequently used in the spring and autumn seasons, which often make the virus spread quickly in the orchid garden. Some orchid courts use three-dimensional arrangement, when watering the upper orchid seedlings, the water left over will flow to the lower layer, and with the virus in the roots will also spread with the water, although this way of infection is slow, but its influence can not be ignored. The way of a large number of infection is the tissue culture of orchid seedlings in scientific research departments, which is often neglected to cause a large number of infections because of the congenital virus of the original species. This is just like the relationship between mother and baby, once that happens, it will be wiped out. In addition, orchids grow in rural areas and horticulture, because other crops and tobacco, sweet peppers, red beans, peas, and flowers are infected with the Bayras virus (CMT). Transmission through aphid vectors can not be ignored.

1. Do not blindly pursue varieties, do not buy virus orchid seedlings cheaply, especially do not buy orchid seedlings in viral orchid endemic areas, and do not buy seedlings mixed with diseased seedlings, which is the most effective control method.

2. Newly purchased orchid seedlings must be carefully checked to see if they carry poison before they can enter the garden, but do not recruit a wife with infectious hepatitis.

Before entering the garden, we all need to use "virus Bike" 500Mel 700 times solution, add 250x edible rice vinegar solution to soak it for 2 hours, in order to disinfect, after putting on the basin, use "virus Bike" diluent to spray the leaf surface and leaf back once, every 10ml 15 days with this solution to irrigate the root, each for more than 10 times, and then choose medical aspirin 1000 times solution to spray once every season, so as to inhibit the proliferation and spread of the virus.

3. Do not reuse the same cutting tool, use a high temperature flame treatment tool if necessary, or soak in 10% bleach or 2% formalin for 60 minutes to disinfect. It is best to prepare several knives for exchange and put them into the disinfectant immediately after use, just like medical scissors in the disinfectant at any time.

4. When ramets, their hands should also be disinfected with disinfectant.

5. Do not insist on high reproduction rate and high growth rate and excessively high temperature and humidity management, the cultivation of orchid seedlings should not be too dense, the orchid garden must pass through the natural wind, all kinds of fertilizers should be supplied due to demand, and do not apply fertilizer blindly, in case it is counterproductive. The orchid garden permitted by the site had better be cultivated naturally, and high temperature and humidity is the main cause of vocal disease.

6. Prevent the occurrence of insects in the garden, especially aphids.

7. Scientific research tissue culture, virus detection before division and breeding.

8. If pollen is planted, do not take orchids as the male parent.

Although Bellas virus is an incurable disease, it is not absolutely incurable. Experts and Yilan growers from various regions have made some progress in the treatment of Bayas disease. Some Lanyou have achieved effective control of the virus after several years of treatment, which can be said to be a success. The methods are summarized as follows:

First, build up a strong physique. Put the diseased orchid in the place of natural wind, adjust the light temperature and humidity, create good ecological conditions, and suitable for fertilizer supply and spraying, grow strong plants, and improve the ability of anti-virus.

Second, drug treatment: 1, finished pesticide virus, Bike 500 times liquid as effective medicine, adding 250 times solution of edible rice vinegar with strong osmotic function to introduce medicine directly to the disease department; 2, applying heat-clearing and detoxifying traditional Chinese medicine: Radix Isatidis, Flos Lonicerae, Scutellaria baicalensis, Yi Jiexi, Zhizi, Qiye and one flower, etc., choose the combination of 3rel and 5 clocks, and use alternately every month. First, use the leaching solution as the shearing liquid, and finally use the residue to sprinkle the solution with 10-100x liquid; 3. Spray 1000 times of the analgesic aspirin once a season, spraying and spraying both the above ground part and the underground part, omni-directional treatment of spraying once every 7 days, once every 10 words for 15 days, and then once a month or once a month for a year to consolidate the effect.

Third, support the upright and dispel evil, gradually increase the amount of light, more natural wind, more shower dew, normal fertilization, once every half a year, in line with 2 trace element fertilizer and plant biotics, spray medium concentration foliar fertilizer once a month, such as plant power 2003, Gaoli, Gaole, Ashi brand foliar fertilizer.

By making unremitting efforts in this way, we can achieve a short-term cure effect, or at least control the spread.

The editorial Department of "National Orchid" of Sichuan Orchid Association-- Lao Zhuang