What to do if the leaves in Milan are burnt? What to do if the leaves of Milan are yellow

Milan leaves scorched? Dispose of it with this "measure" to prevent the "spread" of a large area

Various causes and solutions for yellowing of Milanese leaves:

1. Insufficient light: Milan needs sufficient sunlight to grow, and if it is placed in a shady environment for a long time, photosynthesis accumulates less nutrients, resulting in yellowing and falling off leaves.

Solution: Move Milan to a ventilated place with scattered light, and turn the direction every month so that Milan receives light evenly. Even if the leaves turn yellow, they will recover slowly.

2. Improper watering: Milan likes moisture, if the pot is not changed for a long time, the nutrients in the soil are reduced, the oxygen is less, the root system will be in a wet state for a long time after watering, and the breathing will be inhibited, and the local root system will cause necrosis and cause the yellowing of the leaves to fall off. In addition, in the high temperature season, if the watering is not timely, the potting soil will be too dry for a long time, and the leaves will turn yellow in the short term.

Solution: If the potting soil is too wet and causes the leaves to turn yellow, you need to stop watering immediately, and in severe cases, you can depot the plants and replant them. If the leaves are yellow due to long-term lack of water, do not water enough at one time, but gradually let the plants recover slowly, and then resume normal watering.

3. Soil pH: Milan likes slightly acidic soil, if the soil is alkaline, it will cause the leaves to turn yellow. The soil in the north is mostly alkaline, and it is difficult to avoid this.

Solution: The easiest way to do this is to try changing the pH of the soil. In the north, water alum fertilizer water 3 5 times a year to reduce the alkalinity of the soil; Change the pot once a year, and the culture soil can be used field soil, pine needle soil and a small amount of river sand.

Most of the soil in the south is weakly acidic, and it can be cultivated directly with river pond mud, and it can be turned over once every 1 2 years.

4. Poor ventilation: The growth of any plant requires good air quality, and the air is usual, if Milan grows in a place with air convection for a long time, it is also easy to have yellowing leaves.

Solution: Pay attention to opening windows for ventilation, and cut off the overly dense branches and long branches on the inside in time to ensure good light and ventilation.

5. Low temperature: The yellowing of Milan leaves often occurs in winter, and the main reason is that the temperature is too low. Milan prefers a warm environment, and when the temperature drops below 5 during the winter, it will suffer from frostbite, which will initially appear as the leaves gradually turn yellow and fall off.

Another point is that it was blown by the cold wind, and Milan turned yellow overnight.

Solution: Once the plant is frostbitten or blown by cold wind, it is difficult to save, which will affect the flowering of the second year, so pay attention to heat preservation in winter.

6. Pests and diseases: Leaf spot disease caused by fungi and other pathogens is easy to make the leaves partially necrotic, yellow spots or patches appear, and the whole leaves are yellow and fall off when they are severe, and yellow-green mottled spots appear on the leaves after being infected by mosaic virus; Suffer from scale insects, red spiders, etc.

Solution: Foliar spraying every 15 20 days 25 30 times dry and pure plant ash mixed with superphosphate to leach the clarifier, or lime water clarifier for pollution-free control, in order to protect branches and leaves, prevent all kinds of pests and diseases.

Causes of yellowing of Milanese leaves:

1. Overwatering.

。Milan likes moisture, and watering should be moderate during growth. If you water too much, it is easy to cause rotten roots and yellow wilting and falling off leaves; Too much watering during the flowering period can easily cause flower and bud drops; Too little watering will cause the edges of the leaves to dry up and the buds to wither.

2. Improper fertilization. Due to the large number of flowering times in Milan in a year, after each flowering, it should be topdressed 2 or 3 times in time to fully rot the thin liquid fertilizer, so that it can bloom endlessly and have a strong aroma.

3. Soil. Milan likes acidic soil, and potted plants should be mainly cultivated soil based on humus.

4. Unreasonable sun exposure: Hydroponic plants just don't need to be exposed to the sun every day, but the leaves of hydroponic plants that have not been exposed to the sun for a long time will also turn yellow. The most reasonable breeding method is to dry once or twice a week, and keep it for two or three hours each time.

5. Lack of iron。During the vigorous growth period, spray ferrous sulfate solution once a week, and the leaves will be green and flowery.

It should be that the fertilizer and water are not sufficient.

The management of Milan should pay attention to: the growing season should be placed in a well-ventilated place, which can not only get more than 5 hours of sunshine, but also have half a day of shade; It is not advisable to apply more nitrogen fertilizer, and should use cooked fertilizer containing more phosphorus and potassium or alum fertilizer water made of livestock hooves and fish scales; Temperatures below 15, too concentrated fertilizers, alkaline or acidic soils, and too weak or too strong light will all have different degrees of influence on the concentration of floral fragrance.

Some Milanese basal leaves fall off, forming top-heavy, affecting ornamentation and growth. In this case, it should be immediately topped to control the growth, and the newly formed inflorescence should be thinned out 1 2, so that the leaf nutrients are sufficient, and the lower leaves should be prevented from continuing to fall off; Prevent the invasion of freezing cold wind or wind through the hall, and prevent the temperature from rising and falling, so as to facilitate recovery; Check whether the potting soil is alkaline and whether there are insect pests, whether there is too much watering, too thick fertilization or the use of raw fertilizer, if there is a symptomatic prevention and control immediately.

Milan is prone to a large amount of defoliation during the winter, which is extremely unfavorable for growth and flowering the following year. First of all, it should be observed from the signs, the black brown wilting of the leaves is a symbol of frost, and the temperature should be increased in time or moved to a warmer place to make it gradually recover. Yellowing and shedding of leaves is caused by poor ventilation or overly dry soil.

The shedding of green leaves is caused by excessive soil moisture, so it is necessary to start with prevention, and when the climate becomes cooler, fertilizer should be gradually stopped and water should be reduced. After winter, the physiological activity of Milan is weak, so it is important to avoid low temperature and high humidity, or dry air. Leaf fall can also be caused by a variety of reasons, such as persistent low temperatures below 5, aisle winds, and long-term lack of sunlight.

Foliar cleanliness should be kept at all times, especially to prevent oil fumes, so as not to interfere with foliar respiration and photosynthesis. In autumn, the room is postponed to exercise its ability to withstand the cold, and the room is released when the temperature is stable after the Qingming Festival in spring, which is conducive to protecting the leaves.

Because of excessive watering, the petiole and the branch are separated. Due to the decrease in chlorophyll, photosynthesis is affected, so that the plant lacks nutrients and weakens and dies. Workaround:

When Milan was transported from the place of origin, the root soil balls were mostly encapsulated with cement. If the cement is not removed or soaked with water when potting, it is difficult to combine with the surrounding nutrient soil after drying and shrinking for a long time, so that the root system is suffocated by hypoxia, and can not absorb water and fertilizer, resulting in the branches gradually drying up and blackening, showing a half-dead state. The potting soil is not suitable for mixing or changing pots at the end of a long time, dry and hard, and the water leaks from the cracks on the side of the pot during watering, and it seems to be watered thoroughly but in fact it is not watered enough, for the same reasons as above.

In addition, a similar situation can occur with overly concentrated liquid fertilizer and water accumulation within a few days of the rainy season. In addition to the sudden death caused by cold and cold, most of the whole plant was caused by scale insects. This situation is particularly likely to occur in winter when the room temperature is too high and the ventilation is poor.

Because the protective color of scale insects is similar to the skin color of Milan branches, sometimes it cannot be seen if you do not pay attention to it. Closer inspection reveals a surprising number of insects on the back of the leaves and on the branches.

Growth habits. It prefers a warm, humid and sunny environment, not cold-tolerant, slightly shade-tolerant, and the soil is best with loose, fertile and slightly acidic soil, and the winter temperature is not less than 10. It is often found in open forests or shrub forests in the low-altitude mountains of Milanese.

Milan likes warmth, sunshine, and fat. The growth temperature is 20 25. Under normal circumstances, when the sun is abundant and the temperature is high (around 30), the flowers that bloom will have a strong fragrance.

If it is placed in the shade in the summer and at the same time a large amount of nitrogen fertilizer is applied, it will cause no or less flowering in Milan and a weak fragrance. Therefore, during the growth and development period of Milan, it is necessary to put it outdoors in a sunny place for maintenance, and pay attention to the appropriate application of more liquid fertilizer containing more phosphorus, it is best to apply broken bones, fish bones, chicken bones and other soaked and rotted alum fertilizer water, often supplemented with some phosphorus-containing chemical fertilizers or fermented rice water, etc., which will help to conceive buds, so that it blooms more, the color is golden, and the smell is fragrant.

Milanese flowers prefer a warm, humid and sunny environment, relatively not cold-tolerant, slightly shade-tolerant, and the growth temperature is 20 25. Moreover, the soil for cultivating Milanese flowers should be loose, fertile and slightly acidic soil is the best, and the temperature in winter is not less than 10.