What to do if the new orchid seedlings rot, what to do if the new orchid seedlings rot in the summer

The orchid sprouts are rotten. There are pests and diseases that need to be controlled**.

AbstractOrchids are prone to black spot disease, so ventilation management can be strengthened first, air humidity can be controlled, and then sprayed with related pesticides. Mycosis will rot the rhizome, which can be sprayed with a solution of 500 times nitrobenzene powder. White silk disease will eventually appear in the infected area of white bacteria, after the onset of the disease, the potting soil with bacteria will be removed, and then sprinkled with lime to disinfect.

Scale insects are one of the harmful pests, which are first manually removed, and then sprayed with a solution of 1000 times of dimethoate.

Orchids are very susceptible to black spot disease, the main symptom is that small black spots appear on the leaves at the beginning, and then gradually expand, and when the lesions form a large black brown, it will continue to spread to the entire leaf, preferably causing the leaves to wither, lack of water, until the leaves fall off, and will also harm the new shoots, causing the whole plant to die. Prevention and control: You can first strengthen ventilation management, promote the normal circulation of air, control the surrounding air humidity, and then spray relevant agents.

Symptoms of mycosis: This disease is mainly caused by infection, which will cause the rhizome to rot, which will not only affect the ornamental value, but also lead to death in severe cases. Prevention and control:

It can be sprayed with a solution of 500 times nitrobenzene powder for sterilization, if there is no ** at one time, it can be used several times in a row.

Symptoms of white silk disease: When there is too much water or poor ventilation, the disease is most severe, and brown spots will appear in the infected area, and finally form black brown spots with white bacteria on them. Prevention and control:

Pay attention to ventilation and light, and after the onset of the disease, you can remove the potting soil with bacteria, and then sprinkle lime for disinfection.

Scale insect symptoms: Scale insects are one of the main pests that damage orchids, causing the leaves to fall down. Prevention and control: first artificially remove the insects, and then spray a solution of 1000 times of dimethoate.

This little nursery of orchids is gone, and then you can only discard them, because this one is broken and cannot be used.

In order to avoid the appearance of rotting seedlings in the summer, more attention should be paid to the daily maintenance and management. For environmental ventilation, ventilation and drainage of planting materials, orchid cultivation methods and the placement of orchid pots, etc., they should be checked in time and dealt with immediately if problems are found. In this way, it is possible to avoid reducing the incidence of summer rot.

First of all, the rot caused by the damage of the root root

If there is a new seedling leaf that burns the tip or turns yellow, it means that the root of the pot has been damaged, and the main reasons are:The planting material is impermeable, the root respiration is blocked due to lack of oxygen, the air circulation is poor, and the moisture is improper

In this case, the rotten seedlings should be turned over in time, the lesion part should be removed, and then sterilized and disinfected, the wound should be dried, and the new planting material should be re-potted and planted, and the moisture should be controlled, the environmental ventilation should be strengthened, and the planting material should be kept slightly moist and dry.

Secondly, the treatment of the seedlings suffering from physical damage

Due to the excessive pressure of the leaves, the leaf veins are blocked, and the pressure parts of the leaves will gradually turn yellow; The leaf tip cannot be restored after being broken, and it is difficult to recover the growth if the crease is too deep; The blade starts at the apex and is torn apart from the middle.

The occurrence of these problems is all physical damage to the seedlings, and local damage should be pruned immediately after discovery. Or change the orientation of the orchid pot to make the space for the growth of the orchid seedlings sparse, so as not to be damaged again

Thirdly, the cultivation of rot seedlings caused by poor management

For example, the outer bracts of orchid seedlings are yellow and fall off, and orchids with a little cultivation experience can judge at a glance that the cultivation method is wrong.

In general, the defective outer bracts of orchid seedlings reflect that the planting material of the orchid pot is too shallow, or the planting material on the surface of the pot is too coarse, or the water supply in the pot is insufficient, at least the upper part of the surface of the planting material is too dry, and the root system is shriveled up by drought.

The treatment of this phenomenon is not limited by time and season, and it is enough to deal with it in time after seeing the problem point.

In short, in order to avoid the phenomenon of new orchid seedlings rotting in summer, more attention should be paid to daily maintenance and management.

For environmental ventilation, permeable and draining of planting materials, the cultivation method of orchids and the placement of orchid pots, etc., they should be checked with jujube letter pureand deal with the problem as soon as it is found. In this way, it is possible to avoid reducing the incidence of summer rot.

Replanting: Cut off the rotten part of the orchid and replant it after sterilization. Propagation by ramification:

Choose robust bushes and plant them in the soil. Causes of seedling rot: overwatering or infection with soft rot.

Maintenance management: keep the environment ventilated, and abide by the watering principle of seeing dry and wet, and watering thoroughly.

1. Replant

If the orchid seedlings are light and only part of the plant is rotten, the rotten part can be cut off, disinfected and placed in a well-ventilated location for drying, and replanted in a new potting soil after the wound has healed.

2. Dividing propagation

After the degree of decay of orchids is serious and cannot be saved, they can only be re-propagated, select robust clusters, plant them in the soil, and then place them in a cool and ventilated position, and then resume normal maintenance after rooting.

3. Causes of rotting seedlings

Orchid rot seedlings may be due to overwatering, the soil is in a humid environment for a long time, which will produce stagnant water, or it may be suffering from soft rot, which mainly harms the stems and leaves of the plant, and causes death in severe cases.

4. Maintenance management

During the breeding of orchids, it is necessary to abide by the watering principle of seeing dry and wet, and watering thoroughly, but to ensure that the potting soil will not appear waterlogged, and at the same time, the plant has a large demand for fertilizer in the growth process, usually every 10-15 days to apply a thin liquid fertilizer.

Dilution of fertilizer, the condition of dead seedlings in orchids may be caused by excessive fertilization, and it is necessary to water a large amount of water to the roots to dilute the fertilizer; Soil change cultivation, orchid zombie seedlings may be caused by soil compaction, and soil change cultivation should be done in time; Spraying pesticides, orchids infected with black rot will also appear stiff seedlings, need to spray pesticides**.

The condition of dead seedlings in orchids may be due to excessive fertilization that causes the root system to be burned and stop growing. You can pour a large amount of water into the roots of the orchid to dilute the fertilizer in the soil, and then transfer the orchid to a ventilated and cool environment for maintenance, so that the water can evaporate as soon as possible, and then replace it with new soil and replant.

Orchids are suitable for growing in loose and fertile slightly acidic soil, if the soil is too alkaline or compacted, it will make the orchid appear stiff. The orchid needs to be depotted, and the orchid needs to be replaced with a moderate pH, soft and breathable soil for replanting, and in the process of maintaining the orchid in the later stage, it is necessary to change the soil every 1 2 years to avoid soil compaction.

When an orchid is infected with black spot, mycosis or is infested by scale insects, it will cause the orchid to grow slowly and become stiff. After the onset of the disease, it is necessary to spray 5000 times of nitroic acid benzene powder solution on the leaves, and after the insect infestation is found, it is necessary to spray the diluted diluted dimethoate emulsion for **.

If the orchid is overwatered or exposed to rain for a long time, the soil air gap will be clogged, and the root system will rot due to lack of oxygen. At this time, it is necessary to stop watering, and use a water-absorbing sponge to drain the stagnant water at the bottom of the pot, and water the orchid every 3 5 days when maintaining the orchid in the later stage, so that the soil is in a slightly dry state.

Causes of leaf heart rot of new orchid plants:

Abnormal growth: mainly due to the imbalance of nitrogen, phosphorus and potassium in the fertilizer applied, the lack of trace elements and the use of excessive growth hormone cause the petiole to be paralyzed, brown and rot.

Improper use of water, fertilizer and medicine: mainly due to excessive dosage of watering, fertilization and spraying of pesticides, inappropriate time or failure to dry in time after the end of the operation, resulting in the rot caused by burning the leaf base.

Invasion of pathogenic bacteria: It is mainly the invasion of black rot that causes the leaf sheath of the new plant to turn yellow to black, and even the center of the leaf rots.

External force damage: Rotting caused by external forces damaging the leaf base or heart leaf.

Prevention and control methods of leaf core rot of new orchid plants: reasonable application of fertilizer; When watering, fertilizing, and spraying, the amount of each application should not be too much, and the time should not be too late, so that the heart leaves can be dried in time; Do not use too much force when removing discarded leaves and wiping leaves; When the orchid is attacked by pathogenic bacteria, it should be sprayed with 700 1000 times of debacterim, carbendazim, dicorsone and streptomycin, or 3000 times of chloramphenicol and penicillin.