What should I do if I have leukemia in begonia?

The prevention and control of powdery mildew mainly adopts a combination of elimination of the primary source of infection and chemical control. When there are lesions on the leaves, spraying once a year can basically control the occurrence of powdery mildew.

1. The commonly used agents for chemical control are 1500 2000 times of 25% powder rust wettable powder or 1000 1500 times of 50% benzolite wettable powder or 6000 8000 times of 40% Fuxing emulsifiable concentrate.

2. When preventing and controlling powdery mildew in the greenhouse, sulfur powder can be sprayed at night in winter.

Applying sulfur powder to heating equipment and letting it play can effectively prevent and control powdery mildew.

3. In the winter dormant period, the deciduous trees, flowers and trees that overwinter in the buds, branches and fruits of the pathogenic bacteria can be sprayed with stone sulfur mixture before germination.

including ground fallen leaves and branches).

4. It is very important to remove the source of primary infection, most of the powdery mildew with its closed capsule shell falls into the ground or topsoil, and the deciduous remains are cleaned and burned in time, and the soil is turned over at the same time to reduce the source of infection. In addition, the breeding and utilization of resistant species is also one of the important measures for the prevention and control of powdery mildew.

5. In production practice, the canopy density of branches and leaves is reduced through reasonable dense planting and plastic pruning.

Especially in greenhouse cultivation, it is necessary to ventilate and transmit light frequently; Reasonable fertilization, application of fertilizer and water before flowering, and cultivation of robust plants can improve the ability of powdery mildew.

In addition, the breeding and utilization of disease-resistant varieties is also one of the important measures for the prevention and control of powdery mildew 5. In production practice, through reasonable dense planting and plastic pruning, the canopy density of branches and leaves should be reduced, especially in greenhouse cultivation, it is necessary to often ventilate and transmit light; Reasonable fertilization, application of fertilizer and water before flowering, and cultivation of robust plants can improve the ability of powdery mildew.

Rose begonias are mostly infected with powdery mildew because of unsuitable environment, and the environment is too humid and poorly ventilated during maintenance. During the onset of the disease, the leaves, shoots and flower buds of the plant will be damaged, and it is necessary to treat them in time. At the initial stage, you can carefully wipe off the white powder with a sponge, spray the fungicide in time, and bask in the sun.

If the condition is more severe, spray the drug. You can choose 25% powdered rust, once a week, spray twice.

For severely affected plants, the back of the leaves is also sprayed. After powdery mildew is controlled, it is still necessary to spray the above drugs or 50% carbendazim 500 times every 15 days. It is not advisable to apply too much pesticide to young leaves, shoots and flowers to prevent burns of plants and young organs.

Precautions for planting begonias.

It is important to note that regular fertilization is especially important in the process of maintaining Lige begonias. With the growth of plants, the amount of nitrogen fertilizer should be reduced, the content of phosphorus and potassium fertilizer should be gradually increased, and the amount of fertilizer should be increased before flowering.

Foliar fertilizer can also be sprayed appropriately, the concentration of foliar fertilizer should not be too large, controlled between 1% and 2%, the spray should be uniform, and the front and back sides of the foliage should be sprayed. Lige begonia is sensitive to nutrient deficiency or too much nutrients, so fertilization should be thin, compound fertilizer can be, and Lige begonia special fertilizer can also be selected.

You can make your own medicine for begonia flowers**, or you can buy carbendazim spraying directly.

Homemade medicines. 1) Green onion liquid: take 50 grams of green onions and mash them into a puree, add 50 grams of water, soak them for 12 hours, spray them with filtrate after filtration, spray them many times a day, spray them for 3 or 4 days, and can treat soft pests such as aphids and powdery mildew.

2) Rice vinegar liquid: Rice vinegar is rich in organic acids, which has a good inhibitory effect on pathogens. Spray the leaf surface with a rice vinegar solution diluted 150 200 times, spray 1 time every 7 days or so, and spray 3 4 times in a row, which can prevent and control powdery mildew, black spot, downy mildew, etc.

3) Baking soda solution: take 5 grams of baking soda (also known as sodium bicarbonate), dissolve it with a small amount of alcohol, and then add about 1000 grams of water to prepare a concentrated solution and spray the plants to prevent and control powdery mildew.

There are often hazards such as gray mold, powdery mildew, anthracnose and leaf spot, which can be sprayed with 200 times Bordeaux liquid to prevent and control.

Hello, there is always white powder on the begonia flowers because of powdery mildew. Powdery mildew is a common disease of begonias, specifically harming young leaves and flower stalks, beginning to appear white powdery disease class, later become gray-brown, the leaves are curled and scorched, the flowers are also few and small, the disease spreads quickly. Generally, you can use 2000 times the powder rust solution to apply the affected area, and spray the rest of the whole plant, once a day for a few days, cut off the serious area and spray it again.

Begonia should pay attention to the prevention and control of pests such as beetles, leaf rollers, aphids, bag moths and red spiders, as well as rot disease and red star disease. Rot, also known as rot skin disease, is one of the most important diseases of many species of begonias, affecting the trunk and branches. Generally, the disease begins in April and May every year, and the peak period is May and June, and the disease gradually eases after July.

At the beginning of the disease, water-stained lesions appear on the trunk, and later the cortex of the diseased part decays, shrinks and sags. Later, many small black needle-like protrusions, known as conidia, grow. Prevention and control methods:

Remove diseased trees, burn diseased branches, and reduce germs**. In early spring, spray stone sulfur mixture or brush the trunk with lime agent. At the beginning of the disease, the lesion can be cut into a knife mark about a centimeter deep into the xylem, and then sprayed with fungicide.

1. Like bright: In addition to the seedlings that need to be raised in a dark place in summer, they need to be in a bright place in other seasons, but avoid direct sunlight, otherwise the leaves will be scorched. Second, like moistness:

Iron cross begonia should not be sprayed with foliar water, in case of rotten leaves, but can be sprayed with ground water, in order to increase air humidity, the potting soil will be too dry will scorch the leaves, but too wet will also rot the leaves and rotten roots, in summer can be put on the pebbles in the water basin with pots, in order to increase humidity, which is very beneficial to growth. 3. Warmth: the growth room temperature is 20 25, 10 18 in winter, can be kept dormant, during this period must be controlled watering and fertilizer, summer should pay attention to ventilation.

Fourth, every year in April and May to change the pot, to loose and fertile humus soil is appropriate, you can add an appropriate amount of bone meal as base fertilizer, the growth period can be every half a month to apply Trem thin liquid fertilizer once, pay attention to fertilizer water do not splash the leaf surface, otherwise the leaves should be ulcerated.

In fact, this potted begonia flower grows white hairs, it may be that it is now some mold, and you should take it to the sun to dry.

With insecticidal water, there is also a kind of heart to grasp the worm with his hands to the family.

Begonia flowers. White spots on the leaves are due to infection with scale insects.

It can seriously harm growth. Therefore, it is necessary to treat it with medication at the early stage of discovery. The scale can be sprayed, the liquid is absorbed by the plant, and the scale insect will absorb the poisonous juice and die. When spraying, the temperature should be high, and the temperature should be between 28-32 degrees, and the temperature should be in a high temperature environment.

The liquid is transmitted faster and is more likely to be poisoned. In addition, it is also necessary to pay attention to timely temperature control and ventilation to avoid reinfection.

Key points of maintenance of bamboo begonia: bamboo begonia likes warmth, suitable growth temperature at 19 24 degrees, not cold-tolerant, winter temperature below 10 degrees leaves are easy to freeze, but the root system is more cold-resistant. Plants don't like bright light and prefer to grow in low light.

It prefers neutral or slightly acidic soils that are loose, breathable and have good drainage performance.

1. What should I do if there are white spots on the leaves of begonia flowers.

Most of the white spots on the leaves of begonia flowers are infected with scale insects, and they should be treated as soon as possible in the early stage of discovery. It can be sprayed with scales, and 750-1000 times of liquid can be selected. The liquid medicine is absorbed by the plant, and the scale insects will absorb the poisonous sap and will die, which has a good effect.

Pay attention to the high temperature environment when spraying, and the temperature should be between 28-32 degrees. Because the higher the temperature, the faster the liquid is conducted, and the more likely it is for pests to be poisoned. When spraying, spray twice in a row, with an interval of 5-7 days.

2. The reason why there are white spots on the leaves of begonia flowers.

1. The temperature is too high: Begonia flowers are mostly infected with scale insects in summer. The temperature in summer is too high, and the insects multiply faster in the hot environment. Therefore, it is recommended to properly cool down when the temperature is high to avoid infection. <>

2. Poor ventilation: If the environment is poorly ventilated, it is easy to be infected with scale insects, especially for indoor maintenance. It is necessary to ventilate more and prune in time to avoid insect pests.

3. Strong floral fragrance: The fragrance of begonia flowers is relatively strong, which is easy to attract scale insects. This situation is difficult to control, usually pay attention to more observation, find pests and timely use of drugs to avoid aggravation of pests.

The main causes of leaf litter are: * Low temperature or extreme heat. Begonia likes warmth, the most suitable temperature for growth is 15 18, although it is a more cold-tolerant species in begonia, but when it is below 5, the leaves are also susceptible to freezing and falling off.

The bamboo begonia is afraid of the heat, the temperature reaches more than 30, and the plant grows slowly.

Bamboo begonia is a flower that is very suitable for maintenance at home, so what should we do if there is a rotten root when we maintain bamboo begonia? Let's take a look at it today. Solution to rotten roots of bamboo begonia:

Pruning rotten root bamboo begonias are very afraid of standing water, if the maintenance period is too frequent watering to cause water accumulation, then the bamboo begonias will have rotten roots.