What causes dark spots in cactus?

The cactus ball has dark spots on it, probably because it is infected with anthrax. The disease begins with water-staining and small light brown spots, which later turn brown, grayish-brown, grayish-white to black-brown, round or nearly circular in shape, and are between centimeters or larger in diameter. Sometimes the lesions are wet rot and concave, with slightly raised edges.

When the humidity is high, small black particles scattered on the spot surface are slightly arranged in the shape of a wheel, which is the fruiting body of the pathogenic bacteria. The germs survive on infected tissues and diseased bodies for overwintering or summering. Its conidia are spread by wind and rain, insects and manipulation, and can also be transmitted.

The appropriate temperature for mycelial development is about 25, and high temperature and humidity are conducive to the pathogenesis of mycelium.

Prevention and control methods:

If you find the lesions, you should dig them out immediately, and the surrounding healthy tissues should also be dug up a little at the same time, apply a small amount of sulfur powder or charcoal powder to the wound, and dry the wound as soon as possible. At the beginning of the disease, 25% chartrane wettable powder, or 20% methyl tobuzin wettable powder, or 80% anthrax Fumei wettable powder were mixed into a paste and applied to the spots, and the sterilization effect was better. Cultivated in small quantities at home, it is easy to apply medical Dacrine ointment around the lesions.

Be careful not to let the cactus ball get too wet in the future.

This one is broken from the inside, and it will be too late to see it. If the whole ball is a black spot, you can dig more, or reinsert the upper half into the sand to root. If most of them are broken, they will have to .........

If you are sick, you must water it more, and put the cactus in a dark and damp place, if it is all brown water, then your cactus is dangerous, it is better to take it out of the soil and dry it in the sun, it may be able to save it.

It's not anthrax, it's not black on the cactus, it's estimated that you've watered too much, it's rotten, and you don't need to prevent it, if you want to prevent it, use streptomycin as soon as possible, agricultural use, medical treatment.

The whole blackening is the whole beginning of corruption, and there is basically no solution, so buy a new seed.

First, the reason for the corruption of the cactus.

In the hot summer, the decay of cacti is more, and the cause of plant tissue decay is mainly caused by improper watering.

As we all know, cactus is a very drought-tolerant plant, like a warm and dry environment, usually watering flowers as long as you see dry and wet, if watering too often, so that the potting soil is in a moist state for a long time, it will affect the root respiration, cause damage to the root system, and lead to the plant infection bacteria. In addition to causing rot due to excessive moisture of potting soil for a long time, if the fertilizer concentration is too high, it will also burn the root system and cause the spheroids to rot.

What should be done with small areas of decay in small localities.

When the cactus is found to show signs of decay, it is necessary to deal with it in time, otherwise the rotten parts will become larger and larger, and it will be more troublesome to deal with.

If the initial local small area is decomposed, this situation is still easier to deal with, you can use potassium permanganate or carbendazim to sterilize and disinfect the knife, and then dig out the rotten part thoroughly, and then sprinkle clean plant ash or sulfur powder on the wound to sterilize and disinfect, so that the wound heals quickly.

What should be done if there is a large area of decay in the cactus sphere.

For example, the cactus ball has a large area of decay, or there is a large depth of hole decay. While most of these plants can also save lives, they require a large amount of decaying tissue to be removed and take longer for the plant to return to normal growth.

When there is a large area of decay in the cactus sphere, it is also necessary to use a sterilization prop to remove all the decaying tissue until it is cut into new tissue. If it is not removed, it is still easy to continue to rot in the later stage.

If the ball rots out of a deep hole, dig it until there is no decaying tissue at all. After cleaning, wash the wound several times with potassium permanganate or carbendazim. Then replant with clean soil.

How to prevent the cactus from rotting?

In order to prevent the cactus from rotting, the usual watering must be reasonable, as long as the potting soil is not particularly dry, it is not necessary to water it frequently. Especially in the summer high temperature period, many varieties of cactus will be dormant during the high temperature period, and the demand for fertilizer and water is not large. If it is maintained with large water and fertilizer, it is easy to be damaged.

Cactus blackening treatment method: If you find that the cactus ball is black, it is necessary to check whether the potting soil is hardened in time, if there is a compaction, the potting soil should be loosened in time, and the root system that has rotted is cut off at the same time, and the loose potting soil is generally carried out once in about 2 months, which is conducive to the loose potting soil and ventilation and drainage, which is conducive to the normal growth of the root system.

This is a clear sign of plant death and can be disposed of by burying it.

When the cactus spot should be combined with a number of reasons to deal with it in a timely manner, if the soil is improper, it should be treated in a timely manner, and the mixed soil of peaty soil and fine sand and decomposed organic fertilizer should be used as the culture soil, and the water should be controlled in time to control the watering, and the root system should be removed and disinfected after potting, and then the watering should keep the potting soil dry.

1. Soil replacement treatment

Cactus likes to grow in the soil with strong permeability and rich in organic matter, if the selected soil is too poor or poorly drained, it will lead to the growth of the root system is blocked, and the stems and leaves are prone to spots.

2. Reduce moisture

Cactus has a strong drought tolerance, if it is watered too much during the usual maintenance, resulting in blocked root drainage, there will be a lot of spots on the stems and leaves, and it will gradually yellow and wilt, so what to do if the cactus has spots, at this time should control the watering in time, take out the root system and disinfect it with potassium permanganate solution, and keep the potting soil dry after watering.

3. Strengthen ventilation

Cacti like to grow in a well-ventilated environment, if the plant is often moved to a closed environment during the maintenance period, it is easy to breed a lot of spots, and the plant will not grow much, it is best to strengthen indoor ventilation and ventilation in a high temperature and humidity climate, or put it on the balcony outdoors is the best.

4. Prevent pests and diseases

When the cactus is affected by gray mold, rust or brown spot during the growth period, there will be a lot of irregular spots on the leaves, which will eventually lead to the wilting of the plant, it is best to cut off the diseased plants and destroy them, strengthen the surrounding air circulation, control watering, and spray a thin carbendazim or dimethoate solution every half month.

There are many types of cactus, there are flowering and difficult to bloom, there are flowering good-looking and flowering is not good-looking, for example, golden amber is difficult to raise flowers, although it can be raised to a large basin, but it may not be able to bloom, I have raised a lot of pots of golden amber, for several years, the bigger and bigger, but there have been no flowers. There are also some cacti that laugh and scatter tall flowers every year.

Either way, cacti are quite easy to feed, solid, drought-tolerant, and relatively cold-tolerant.

If there are black spots on the cactus, check whether the potting soil is too hard and barren, or watered too much, or rained too much, resulting in too much water in the potting soil for a long time, resulting in water accumulation and rotten roots, which will lead to black spots in the cactus.

On the other hand, if the potting soil is dry for a long time, although it is drought tolerant, it cannot be watered for a month or two, which is not conducive to its growth. If the root system is good, check the sphere of the cactus, wear thick gloves on the excavation, and press the cactus slightly, if it is relatively hard, the inside of the cactus ball is not rotten, and the problem is not very big.

Put it in a ventilated and sunny place, reduce watering and control watering, slow down, it is afraid of unventilated and stuffy environment, put it on the windowsill, terrace, one is ventilation, the second is that the potting soil should not have water, and the third is that there is sunlight, it can grow very well.

There are several cases of macula in cactus containing tung balls:

The cactus may be "sick". Treatment method: treat it with a fungicide or cut it with a knife and then treat it with a fungicide; Cactus balls are kept in a humid environment for a long time.

Solution: Put the cactus in a dry place; When the temperature is low, the cactus will produce frost spots and even fester. How to deal with it:

Move the cactus to a warm and bright place, Tachibana Chang; After watering the cactus, the light is insufficient, and the water does not dry for a long time, resulting in macular growth. Cactus likes to have a lot of sun, especially in winter, and the sun should be more exposed to prevent mold from multiplying. Solution:

Use a brush to remove the macula, rinse it off with warm water and dry it in time.

Cactus macular disease**:

1. If the macula is not large, put the cactus in a sunny place for maintenance, and then scrape off the injured part and apply lime for disinfection.

2. Put it in the shade, and apply lime disinfection on the wound, but it is not humid tolerant, drought and heat resistant, and then take it outside to bask in the sun. Cacti are tropical plants that scrape off injured tissue.

3. Spray carbendazim once every half month to 20 days, 4. Spray gram net once every half month.