What is the disease of bulb orchid whitening frost? What is the matter with white spots on the leave

The white spot on the orchid is white spot disease, which is related to the growth environment of the orchid and the invasion of diseases and insects. In an unevenly lit and dark and humid environment, orchids will not be able to absorb nutrients and are prone to white spots. Diseases and insects are also orchids with white spots, diseases and insects erode orchid leaves, spread a large number of germs, will make orchid leaves yellow and wither quickly, resulting in white spots in orchid flowers.

Orchids with that white spot on them are white spots.

What is the disease of having that white spot on the orchid.

The white spot on the orchid is white spot, and in the case of insufficient light, the leaves cannot photosynthesize normally, which will cause the leaves to turn yellow and appear white spots. If the light is too strong, the leaves of the orchid will be sunburned, and white spots will also appear. White spot disease will increase the number of white parts of the leaves of orchids, and the nutrients of the leaves will be lost, and finally they will turn yellow and dry up.

What is the disease of having that white spot on the orchid.

If the orchid is infested by pests and diseases, white spots can also appear. Some pests and diseases absorb the sap of orchid leaves, resulting in less chlorophyll in orchid leaves. Diseases and insects will also spread the virus and germs carried on the orchid leaves, so that the nutrients of the leaves are quickly lost, the leaves turn yellow and dry, and gradually wilt, so that the leaves gradually appear white spot symptoms.

What is the disease of having that white spot on the orchid.

To avoid white spot disease, orchids grown at home need to be evenly lit. Put the orchid in a place where the sun shines, let it photosynthesize normally, and at the same time ensure that its surrounding environment is dry and ventilated, and properly watered and fertilized. During the summer high temperature, it is best to avoid the high noon heat and choose a time period with a suitable temperature in the morning to give the orchid a light source.

What is the disease of having that white spot on the orchid.

If the orchid has already suffered from white spot disease, if it is a problem with sunlight, it is necessary to immediately change the living environment of the orchid and move the orchid to a suitable position. For flowers with fewer white spots, the leaves with white spots can be pruned appropriately. If the leaves are white spots caused by insects and diseases, you can go to the pharmacy to buy relevant insecticides, follow the instructions for insect control, and always keep the orchid growth environment dry and ventilated.

Generally, white frost is downy mildew, and it may also be a cross-infection of downy mildew and powdery mildew.

This is related to the variety of the orchid, this kind of orchid is called the spotted leaf orchid, the leaf color is milky green leaf surface mixed with white, light yellow patches, when flowering like a fairy stick like an umbel inflorescence, 10 15 flowers are clustered at the top of the flower stem, each small flower is pink and five-pointed star-shaped, the petals are thick and waxy, with aroma.

The original bulb is native to India, southern China, and Myanmar. It likes high temperature, wide pin tung and humid and semi-shady environment. It is not cold-tolerant, shade-tolerant, drought-resistant, afraid of strong light exposure, and avoid excessive humidity. The suitable temperature for growth is 18 24, and the winter temperature is not lower than 5.

Summary. Prevention and control methods.

Efforts to improve soil drainage conditions can effectively prevent diseases. Usually water appropriately, water less but thoroughly, and do a good job of loosening soil ventilation. Prevent rain and dump water in the basin in time.

You can put more broken tiles and small stones at the bottom of the pot to facilitate drainage. When the disease occurs during the growth period of white orchid, chemicals such as 65% zebsen 250 times, 50% dysenium 250 times, or more than 50% mycopyram 500 times can be used to irrigate the root soil.

What is the disease of the leaves of the white orchid?

Anthrax: Confess first cut off the diseased leaves, and then spray it every 10-15 days with 100-200 times Bordeaux solution or 70% methyl tobuzine 1000 times, **. Root rot:

First, depot the plant and cut off the rotten roots. The front swim is then replanted with sterile, water-free new soil. Yellowing:

Cut off the yellowed leaves in time, and spray the leaves with ferrous sulfate solution for **.

The control method improves the watering method, injects water from the edge of the pot, pays attention to controlling the amount of water, and prunes the diseased leaves. In the rainy and rainy periods, it is generally sprayed every 10-15 days with the same formula of 100-200 times Bordeaux liquid, 65% Dysen solution with 500-800 times of zinc, or 70% methyl tobuzin 1,000 times of liquid, and sprayed three or four times in a row, which can play a role in inhibition.

The root rot of the white orchid is a fungal disease. It is due to the root system of the white orchid that is overwatered or suffered from waterlogging and the root system turns black and rots, and the mild ones grow poorly, and the leaves turn and fall off early, and in severe cases, it will cause the death of the plant.

Prevention and control methods: Efforts to improve soil drainage conditions can effectively prevent diseases. Usually water appropriately, water less but thoroughly, and do a good job of loosening soil ventilation. Prevent rain and dump water in the basin in time.

Rotten heads can be padded at the bottom of the basin with more broken tiles, small stones, etc. to facilitate drainage. When the disease occurs during the growth period of Bailan, you can use 65% zebsen 250 times solution, 50% dysen ammonium 250 times solution, or more than 50% mycophine 500 times Liqi double solution and other chemicals to irrigate the root soil.

The yellowing symptoms of white orchid are physiological diseases. White orchid likes slightly acidic soil, due to the alkaline nature of the potting soil, coupled with the use of water containing more salt and alkali into the bench wax line daily watering, resulting in the white orchid leaves from the original emerald green and not destroyed color gradually faded into yellow, whitish, when the leaves are brown, the disease is more serious, at this time the leaves are local necrosis.

The control method is to spray ferrous sulfate solution three or four times a week on the foliage continuously, and apply alum fertilizer water at the same time.

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This is related to the variety of the orchid, this kind of orchid is called the spotted leaf orchid, the leaf color is milky green leaf surface mixed with white, light yellow patches, when flowering like a fairy stick like an umbel inflorescence, 10 15 flowers are clustered at the top of the flower stem, each small flower is pink and five-pointed star-shaped, the petals are thick and waxy, with aroma.

The original bulb is native to India, southern China, and Myanmar. It prefers high temperatures, humidity and semi-shady environments. It is not cold-tolerant, shade-tolerant, drought-resistant, afraid of strong light exposure, and avoid excessive humidity. The suitable temperature for growth is 18 24, and the winter temperature is not lower than 5.

It is normal for the leaves of the orchid to have white spots, this kind of orchid is called the spotted leaf orchid, the leaf color is milky green with white, light yellow patches on the leaf surface, the umbel inflorescence is like a fairy stick when flowering, 10 15 flowers are clustered at the top of the flower stem, each small flower is pink and five-pointed star-shaped, the petals are thick and waxy, and have a fragrance.

The original bulb is native to India, southern China, and Myanmar. It prefers high temperatures, humidity and semi-shady environments. It is not cold-tolerant, shade-tolerant, drought-resistant, afraid of strong light exposure, and avoid excessive humidity. The suitable temperature for growth is 18 24, and the winter temperature is not lower than 5.

Is it harmful for orchid planting material to grow white filaments? One by one, speak with facts, and use practical experience to take you to raise the flowers at home. When we plant orchids, after planting the orchids in pots, sometimes there is some planting material left.

If these planting materials are not dried in time, they are stacked in one place or placed in a container, and after a few days, they are likely to produce some white filaments, as the saying goes, "white hair".

In fact, this white filament is gone when it is put in the sun, and it is not necessarily a virus bacteria. In many cases, it is just a mold produced by the normal fermentation of humus material. And this mold only occurs in a specific humidity and temperature environment, and this fermented mold is not only harmless to orchids, but also has many benefits.

Just like the tofu we eat, it is also a kind of white filamentous mold that will be produced during the fermentation process. After the fermentation of this mold, the protein in the tofu milk is more easily absorbed by the body.

So, how does this white filament come about? The production of this white filament is due to the fact that the humus material in the orchid planting material is not completely fermented. Second, because the specific moisture content and temperature are suitable, the planting material will produce this white filament.

Some of the humus materials we use, such as pine bark, peanut shells and other materials, are not fully fermented, the moisture content of the materials is less than 30%, and the ambient temperature is higher than 20 degrees.

If the water content of the planting material is more than 30% after potting, and the ventilation conditions are relatively good, even if the planting material in the pot is not completely fermented, this filament will rarely appear. As long as the planting material is strictly disinfected before potting, and then this white filament appears in the planting material, there is no harm to the growth of orchids, which means that the planting materials are not completely fermented, and the watering of orchids is a little less. The moisture content of orchid planting material in summer should be between 30% and 50%.

Therefore, you can increase some watering amount appropriately.

If the planting material has not been strictly sterilized before potting, it is recommended to sterilize the planting material again or replace it with a fully fermented and sterilized planting material. Pay attention to the summer breeding of orchids, in the case of good ventilation conditions, the moisture content of the planting material in the pot should be between 30% and 50%, and the air humidity of the orchid environment should be about 70% to 80%. In this way, it is more conducive to the normal growth of orchid sprouts.

White spots appear on the orchid leaves, find out the way, and then solve it simply.

It doesn't have to be powdery mildew, it may be caused by pests and diseases. It may be caused by poor ventilation during the planting process. There can be a variety of reasons for this, and it is advisable to find a professional to take a look.

It's really because of powdery mildew, maybe it's because you're sick that you get sick that you have such white spots.

Orchids have small white spots, which may be the cause of scale insects, which can be brushed with a small brush, or dipped in alcohol, laundry detergent water, etc. to wipe the leaves or spray insecticides directly**. It may also be the cause of powdery mildew, and carbendazim and chlorothalonil can be sprayed 2 or 3 times in a row. It may also be the reason for the lack of sunlight and poor ventilation, but orchids see more light and maintain good air circulation.

No, the white spots growing from this orchid are actually very normal, which is the manifestation of fading on the petals of the orchid.

This is the orchid "white silk disease" undoubtedly.

The symptoms are: white silky hyphae layer appears in the decay part of the later stage of the disease, and some small brown spherical sclerotia grow on it, and there will also be white hyphae and small sclerotia on the surface of the planting material.

The appearance of yellow leaves in white orchids is nothing more than two conditions, namely yellowing due to iron deficiency and root rot due to excessive moisture.

i) Yellowing: mainly potting soil is alkaline. Reasons why the potting soil is alkaline:

First, the potting soil itself is alkaline; The second is to apply more alkaline inorganic fertilizer or water. Symptoms: The leaves gradually turn from green to yellowish-white, and in severe cases, the leaves are brown, forming local necrosis.

When the leaves begin to turn yellow, timely foliar spray with ferrous sulfate, once a week, 3-4 times in a row, or once a week with alum fertilizer water, spray once, spray continuously, the disease can be controlled.

2) White orchid root rot: the cause of root rot is: overwatering and not pouring water in the pot in time during continuous rain.

Symptoms: The root system is black and rotten, and the leaves are yellowed and fall off, resulting in the death of the whole plant. Therefore, it is usually necessary to wait until the surface of the potting soil is whitish before watering, and loosen the soil frequently.

When the rainy season is too bad or there is too much rain, it is advisable to move under the eaves or indoors to take shelter from the rain; When potting, more broken tiles should be added to the bottom of the pot to make the drainage smooth, and the pot should be put up with bricks to speed up the speed of water flow.

See for yourself which one it is.

The surface of the soil should be dry, and the inside is the best state to be moistened, and the roots will be drowned by watering too much. It is better to change the soil for ventilation.

Bought a pot of gardenias, and the leaves are the same. I checked it on the Internet and found that it was a fungal disease, and then I sprayed it with a watering can by injecting penicillin into water. In less than a week, of course, the leaves that already have dark spots should be cut off in advance and isolated.

You can try, there is nothing *** in this method, and it does not belong to the category of pesticides.