What is the reason for the white mold on the leaves of the azaleas and the white powder on the leave

Rhododendron leaves have white mold after the rhododendron leaves, which is a common powdery mildew of rhododendrons, and is caused by a fungus.

A layer of white powdery mold grows on the surface of the diseased part, which is the conidia of the vegetative generation of the pathogen. In the later stage, the white powdery mold layer turns pale gray, and small black particles are produced on the affected leaves or branches, that is, the closed capsule shell of the sexual generation of the pathogen.

Prevention and control: fine pruning in early spring, cutting off diseased branches and leaves, and burning them in time.

Increase the application of pica phosphorus and potassium fertilizer to control nitrogen fertilizer.

At the beginning of the disease, 50% carbendazim wettable powder 800 1000 accompaniment solution, or 70% methyl tobuzine can be sprayed.

1000 times liquid. Spray Baume 3-4 degree stone sulfur mixture before germination.

If you notice powdery mildew on your azalea leaves, it's usually because you're infected with powdery mildew, a fungal disease.

Once found, the diseased leaves should be pruned off as soon as possible and burned thoroughly to avoid leaving germs. If the disease is severe, spraying is required. Just use diluted carbendazim solution and spray it several times, which can be well controlled.

In addition, it is necessary to change the environment in the later stage, strengthen ventilation, and control humidity, which can reduce the incidence of disease.

In the usual maintenance process of rhododendron, potassium dihydrogen phosphate can be appropriately applied to enhance the resistance.

Rhododendron leaves have powdery mildew, usually caused by powdery mildew, and can be solved in two ways. One is to use green onion liquid, 50 grams of green onions mixed with 50 grams of water, soak for 12 hours, then fill the juice in a watering can and spray it on the leaves. Multiple times a day, three or four days to see the effect.

The second is to use rice vinegar liquid, which is configured in a ratio of 1:150, sprayed once a week, and can be effective three or four times in a row. It can also be used with special agents in combination with Bika foliar fertilizer.

The white spots on the leaves of azaleas are caused by red spiders. Leaf mites, also known as red spiders. It is often harmful to rhododendron, yueji, celery eggplant, a bunch of red, begonia, true cypress, kumquat, generation, cactus, dragon cypress, etc., among which rhododendron and true cypress are the most seriously affected.

Leaf mites are small, red, and difficult to see with the naked eye. Like to suck the juice on the back of the leaves, the victimized leaves turn yellow, many small white spots appear, and soon wither and fall off. Leaf mites have a strong reproductive ability, which can occur for more than 10 generations a year, and often breed in high temperature and low humidity environments.

Control method: remove weeds in the pot and eliminate overwintering insect eggs. 1000-1500 times of 40% dimethoate emulsion (i.e., 1 kg of water is added to 1 1 5 grams of dimethoate), or sprayed with 40% dicofol emulsion 2000 times.

The cuckoo leaves appear to be half dried up, and in the end they die, don't blame them for not reminding.

The flowers you water with tap water are all water shows.

<> rhododendron leaves have white spots, these leaves need to be cut off, and then sprayed with special insecticides**, and then the maintenance should be reasonably watered, so that the soil is in a moist but not wet state, but also let it have an appropriate amount of scattered light irradiation, and place it in a ventilated and warm environment to grow.

1. Handling method.

The leaves of the rhododendron have white spots, which may be caused by the production of military matching insects, at this time we need to cut off the leaves that produce white spots, and then use special insecticides to spray them after cultivating**, otherwise the situation is too serious, and the growth of the plant will become weak.

2. Reasonable watering.

If you want to avoid the phenomenon of white spots on the leaves of azaleas, then you need to water it reasonably during daily maintenance, and it is best to let the soil be in a moist but not wet state, which is most conducive to its growth, and must not be watered too much, otherwise it is not conducive to the growth of azaleas, and it is easy to cause its root system to rot.

3. Suitable for light.

When maintaining rhododendrons, if you want to make it grow healthily, then you also need to let it have a suitable amount of light, and it is best to place it in a semi-shaded circumference every day, so that it can be irradiated with an appropriate amount of scattered light, otherwise the light is insufficient or the light is too strong, and the azalea is easy to dry up and die.

4. Environmental requirements.

If you want to avoid white spots on the leaves of azaleas, then you also need to make it have a suitable environment, it is not cold and heat tolerant, summer and winter need to do a good job of temperature control measures for it, it is best to put it in a warm environment, daily ventilation management for it, to avoid it to grow in a sultry environment.

The leaves of the rhododendron brother flower have white spots, so you need to cut off these leaves, and then use a special insecticide to spray it**, and then maintain it to be reasonably watered, so that the soil is in a moist but not wet state, but also let it have an appropriate amount of scattered light irradiation, and place it in a ventilated and warm environment to grow.

Rhododendron leaves have white spots.

1. Handling method.

The leaves of the rhododendron have white spots, which may be caused by the production of military match insects, at this time we need to cut off the leaves that produce white spots and dust grinding spots, and then spray them with special insecticides**, otherwise the situation is too serious, and the growth of the plant will become weak.

2. Reasonable watering.

If you want to avoid the phenomenon of white spots on the leaves of azaleas, then you need to water it reasonably during daily maintenance, and it is best to let the soil be in a moist but not wet state, which is most conducive to its growth, and must not be watered too much, otherwise it is not conducive to the growth of azaleas, and it is easy to cause its root system to rot.

3. Suitable for light.

When maintaining rhododendrons, if you want to make it grow healthily, then you also need to let it have a suitable amount of light, and we had better place it in a semi-shaded environment every day, so that it can be irradiated with an appropriate amount of scattered light, otherwise the light is insufficient or the light is too strong, and the azalea will be easy to dry up and die.

4. Environmental requirements.

If you want to avoid white spots on the leaves of azaleas, then you also need to make it have a suitable environment, it is not cold and heat tolerant, summer and winter need to do a good job of temperature control measures for it, it is best to put it in a warm environment, daily ventilation management for it, to avoid it to grow in a sultry environment.

Through our introduction, I believe you have a deeper understanding of what to do if there are white spots on azalea leaves.