How is orchid stem rot treated? How to deal with orchids with stem rot

Orchid stem rot ** method:

First of all, the whole pot of orchids should be removed, washed, and then all the diseased plants should be cut off, and the decayed parts should be repaired with a razor blade. Then soak the orchid in a sterilization agent for one hour and then leave it in a cool place to dry.

Then mix the manganese zinc of methaglamin, which is adjusted into a paste, smear it on the stem of the orchid, and dry it. Finally, the false bulb of the orchid can be wrapped in sterilized aquatic plants and replanted with new pots and soil.

Economic Value:

The value of the orchid itself stems from its high ornamental value, wide range of medicinal value and edible value, which is the innate natural attribute of the orchid. In addition, orchids also have unique fragrance value and rare species value. The economic value of orchids is reflected in a process of gradual identification.

Ornamental value: orchids have wonderful flower posture, rich colors, quiet fragrance and elegant posture, native to the deep mountains and valleys, our country is called the gentleman in the flower, the fragrance of heaven. The form of the orchid is elegant, the fragrance of the flowers is one of the precious flowers, it is deeply loved by the people, whether it is a single plant or planted in a piece, it has a very high ornamental value.

Pour the orchid with stem rot into a pot, wash the root system and the reed, cut off the lesions (including the root system and the reed), and cut all the parts infected by the germs.

A small spoon of carbendazim (a plastic spoon like a fast food restaurant is sufficient), mixed with a small amount of water to make a paste, applied to the incision, and then put the orchid seedlings in a cool place (after autumn, you can bask in the sun) to dry the wound.

Pot with 30% water content, raise the orchid a little higher when planting, and try to expose part of the reed head above the soil surface to breathe fresher air. There is no need to water it for 3 days, and the orchid pot is maintained in a cool and ventilated place. Because there are no robust orchid seedlings yet, there is no need to consider photosynthesis, as long as you can bask in the sun for an hour every day.

Prevent germs at all times and do a good job of disinfection.

High temperatures, high humidity and poor ventilation are the main culprits for germ outbreaks. Therefore, in the environment of high temperature and humidity, increasing ventilation and moderate light are effective measures to avoid stem rot, and there are also preventive measures to take drugs. It can be diluted and sprayed with carbendazim, thiophanate-methyl (methyl tropia), jinggangmycin, mancozeb and other drugs.

During the high incidence period of pathogens, it can be sprayed once every 5 to 7 days.

For diseased plants, cut off the serious part, and the slight part can be combined with spray, with fine sand and nail tray in a 1:1 match, sprinkled on the affected part of the plant, which can also effectively inhibit the continued spread of the disease. To sum up, orchid stem rot is multiple, as long as we grasp the law and causes of the disease, and do a good job of prevention in advance in management, unnecessary losses can be completely avoided.

Clean up the residual soil of the rhizome, cut off the rotten part of the orchid rhizome, use the knife after each use, put it on the flame for high temperature burning, complete the burning and disinfection before the next excision, and then soak the root system in carbendazim for half an hour, and use new pots and new soil for planting again after treatment.

If the orchid has stem rot, you need to take the orchid out of the pot first, clean up the soil left on the rhizome, carefully observe the root system of the orchid, and cut off the rotten part of the orchid rhizome. The knife used for excision needs to be sterilized on an open flame after one excision before the next excision can be carried out to prevent the wound from infecting the orchid rhizome.

After cleaning all the rotten roots, soak the remaining roots in carbendazim aqueous solution for half an hour to kill the germs remaining in the healthy parts and prevent the orchid plant from being infected with the germs again, making the stem rot **, and threatening the health of the orchid plant again.

After completing the disinfection, it is necessary to treat the wound that has just been cut in time to prevent germs from invading the orchid from the fragile wound. The knife used for excision is burned on an open flame for about 10 seconds, and then the burned part is applied to the incision of the orchid rhizome for 1 second, and the wound is quickly sealed by high temperature.

When using a burning knife to scald the rhizome of the orchid, the time should not be too long, so as not to damage the cell tissue inside the rhizome. After the orchid plants are treated, new pots and new soil should be used again to prevent the original potting soil from remaining with germs, and the new soil is recommended to use fine-grained bark planting material and small stones 1:1 mixed soil.

**The special drug for orchid stem rot is stem rot emulsifiable concentrate, which is an imported agent, which is specially used for **orchid stem rot, and the agent needs to be diluted at a ratio of 1:600 before giving orchid medicine. Stem rot emulsifiable concentrate can not only be used to prevent stem rot, but also to prevent stem rot and bacteria, and the medicinal effect is very strong.

Orchids are easily infected with stem rot during the growth process, and once infected with stem rot, the stem of the orchid will rot, shrink until it dies, so what is the special medicine for orchid stem rot. After the orchid is infected with stem rot, it can be sprayed on the plant with stem rot emulsifiable concentrate, and the agent needs to be diluted in water at a ratio of 1:600.

Stem rot emulsifiable concentrate belongs to the imported agent, this agent is specially used for ** orchid stem rot, usually sprayed once every 7 10 days, sprayed 3 or 4 times in a row will be relieved. If the condition is better in the later stage, then there is no need to spray again;If the disease is in the later stage, you can spray the plant 1 or 2 times.

In addition to the stem rot, this agent also has the effect of preventing stem rot, orchids are usually infected with stem rot in high temperature and humidity weather, and you can spray the agent on the plant. When buying precious orchids, you can also spray stem rot emulsion on the plants, which can effectively isolate bacteria.

In order to completely solve the problem of orchid infection stem rot, we have to start from the breeding process, and often wipe the leaves with wet towels when breeding orchids, so as to ensure that the leaves are clean. When cultivating orchids, it is best to place the plants in a ventilated environment, which can reduce the chance of bacterial growth and also facilitate plant growth.

The "two rots" of orchids should be detected as early as possible, and they must not wait until the disease is very serious to prevent and control. Moreover, soft rot and stem rot are also easy to confuse, and the main difference between the two is: the base of the soft rot plant is rotten, with thick fungi and smelly;The basic part of the stem rot plant is also rotten, but it has white hyphae and no odor.

1) Stem rot

The initial symptoms are distorted leaves, dull and dull leaf color, and a state of dehydrationThe leaves turn yellow and scorched from the tip of the leaf and extend downwards until the whole leaf dies.

The pathogen invades from the junction of the pseudobulb and the root system, and the pseudobulb first turns black-brown from the root disc and gradually spreads upward to necrosisThe leaves of the whole plant gradually withered and yellowed from bottom to top, and finally the whole plant withered and died.

The onset of stem rot is from leaf development to seedling stage, and the most important diagnostic feature is that the outer part of the pseudobulb turns brown to black, and its internal tissues and vascular bundles become brown and necrotic.

Prevention and control methods

If there are individual orchids in the orchid garden, they should be removed and destroyed in time to avoid infection with other orchids.

Choose 50% carbendazim 1000 times and 10% difenoconazole water dispersible granules 2000 times to spray adjacent orchid pot plants, especially pay attention to spraying on pseudobulb parts to protect from infection in time.

If the disease is mild or has just started to develop, it should be depotted in time, and more than 1 2 seedlings should be removed from the orchid seedlings that are still healthy on the side of the diseased plants, and then the diseased seedlings should be destroyed.

Soak the false bulbs and roots of the remaining healthy seedlings with fungicide for 20 30 minutes, dry the liquid and plant them with new planting materials and new orchid pots, and isolate and maintain them.

2) Soft rot

Disease spots mostly occur on orchid seedlings that are born in the current year, and can occur at the germination, seedling and seedling stages of orchids. The disease occurs first at the base of the junction with the pseudobulb and gradually spreads upwards.

The onset of the disease prevents the decay of water stains, the yellow-brown skin is rolling, and the smell is foul, and the surface of the affected part will ooze white bacteria when the humidity is high; When the soft rot disease is severe, the leaves of the whole plant rot from the base, and the whole plant dies.

Prevention and control methods

Microbial pesticides such as Agrobacterium radialiform preparations and Bacillus subtilis preparations can be applied to orchid peanuts for a long time to prevent the occurrence of diseases; If there is a single bluegrass in the orchid room, it should be removed and destroyed in time

Then spray with 400 500 times of 20% thiobacterium copper suspension or 1000 2000 times of 72% agricultural streptomycin sulfate wettable powder to prevent infection of other bluegrasses.

After the root rot of the orchid occurs, the orchid needs to be depotted first, the rotten root system is cut off, and then 70% alcohol is used to drop on the rotten root system of the orchid, and then the orchid is used to dry the orchid for 1 day, and then prepare loose, fertile and breathable soil.

Orchid maintenance

Most orchids are shade-loving plants, which need to be maintained in a cool and ventilated environment every day, and cannot be directly placed in direct sunlight for maintenance, otherwise it will affect the growth of Somo Helan orchids, and can be properly exposed to sunlight.

Orchids like a cool growth environment, the suitable growth temperature is between 16 and 25, when the outside temperature is too low or too high, the growth of the plant will be affected, and it needs to be maintained in a warm environment in winter, otherwise the plant will be frostbitten.

During the growth of orchids, nutrients need to be supplemented regularly, and the concentration of nutrients should not be too high, otherwise it will burn the root system of the plant, and thin fertilizer needs to be applied frequently.

In the case of mild orchid infection, the use of disulfon, Fushou Shenmei double or methamine 500 800 times liquid soaking pot, so that the root system and planting material of the orchid plant are fully soaked in the solution, and the soaking time is 12 24 hours. Soaking for such a long time will make the plant fully absorb and achieve the best sterilization effect; When the stem rot infected by the orchid plant is more serious, it should be immediately repotted and cut off the disease, and it is advisable to improve the quality.

Orchid stem rot is one of the world's diseases, and its pathogen is Fusarium. Fusarium is a filamentous fungus called "Fusarium" because of the large conidia produced during the vegetative reproduction stage that resemble a "sickle".

Orchids are likely to develop throughout the growth and development season.

Methods for the prevention and control of orchid stem rot.

1) Excision of the patient at the time of dividing

For the treatment of orchid stem rot, the effective method is to divide the plant.

When the orchid is infected with the disease, it should be made immediately, turn the pot to remove the infected diseased plant, and choose the "road" between the false bulbs to cut until the cross-section of the "road" is fresh and there is no abnormal skin color.

This is by far one of the most effective methods for orchid stem rot.

2) It is advisable to recuperate after treatment

After treatment, the orchid plant should be maintained by plain cultivation, and the planting material should be dry to reduce the number of watering; The pot orchid should be placed in a cool, well-ventilated place for maintenance, and after the seedling condition improves, it will gradually be given scattered light.

Within 25 days after treatment, 2 3 times of 500 800 times of disulfofodi, methamethoxamine and methammetine should be used at intervals to consolidate the efficacy.

In short, orchid stem rot is very serious and needs to be prevented in advance.

In the case of mild orchid infection, disulfonfodib or methafen 500 800 times liquid soaking pot is used to fully soak the root system and planting material of the orchid plant in the solution, and the soaking time is 12 to 24 hours

Soaking for such a long time will make the plant fully absorb and achieve the best sterilization effect; When the stem rot infected by the orchid plant is more serious, the potting should be immediately turned over and the disease should be removed, and the literacy should be appropriate.

Orchid soft rot can be carried out with Bordeaux liquid, chloramphenicol and streptomycin**, and orchid stem rot can be treated with stem rot EC, dichlorphine and dixon. After the orchid produces soft rot, the diseased leaves need to be removed in time, and then the Bordeaux liquid 600 solution is sprayed on the plant, sprayed once every 6 7 days, 2 3 times in a row; After the stem rot of the orchid stem, it is necessary to mix 1 ml of stem fermented milk oil with 600 grams of water, spray it once every 7 10 days, and spray it for 4 times in a row.

Prevention and control of orchid stem chain car rotOrchid stem rot is generally caused by a long period of high temperature, high heat and high humidity, orchids, orchids and planting materials must be disinfected before potting, planting materials should be relatively coarse, orchids should be planted as shallow as possible, the planting environment must be ventilated, the pot surface should not be too wet for a long time, try to use more organic fertilizer, less or no inorganic fertilizer and chemical fertilizer.

Prevention and control of soft rot in orchidsOrchid soft rot is caused by bacteria, spread with the help of wind and rain, through a variety of slight wound invasion hazards, pay attention to ventilation, adjust the indoor temperature and humidity, especially the humidity to reduce the occurrence, to prevent the occurrence of diseases.