A poinsettia leaves yellow leaves how to do, raise the temperature frequently fertilization / water can not be irrigated too much

Because poinsettia flower is very beautiful, and its red color looks very festive, for this reason, many flower friends will choose to raise a pot after seeing it. However, in the breeding process, due to improper maintenance or long-term neglect, poinsettia will get sick, followed by yellowing leaves, then poinsettia leaves yellowing off leaves how to do it? In fact, it is very simple, you can find the cause and solve it. The specific method will be introduced in detail by Xiaobian.

How do you find the yellow leaves and find the cause?

In the culture method of poinsettia, it is introduced that poinsettia has requirements on soil, light, water and so on, so the yellowing of leaves may be that some aspects of them are not up to standard. Plain sailing leaves yellowing how to do, the editor will be from the moisture, light, temperature, fertilization and other aspects for everyone to analyze.

Second, the causes of yellowing and losing leaves of poinsettia leaves and their solutions

1. It is not timely to change the basin

In the cultivation of poinsettia, the first planting is generally to choose a relatively small flowerpot, but after a period of time, the plant will slowly grow, grow a lot, thick branches and leaves, at this time the small flowerpot can affect the continued growth of poinsettia, and the potted soil loses nutrients, resulting in yellowing of leaves.

Solution: when cultivating poinsettia, it is necessary to change the basin in time according to its growth status, and it is necessary to loosen the soil frequently so that nutrients and water can better nourish the roots and avoid soil consolidation.

2. The basin soil is too dry / too little watered.

A poinsettia leaves yellow leaves, in addition to changing the pot is not timely, the first thing to consider is whether the watering is in place. In the breeding of poinsettia, if there is too little watering, or the weather is dry and the light is strong, it is easy to cause the leaves to turn yellow.

Solution: in hot summer or autumn, poinsettias need to be placed when there is plenty of sunshine, but it is best to pour enough water, and need to replenish water in time, spray water to increase air humidity.

3. Overwatering

What is said above is that too little watering leads to the yellowing of poinsettia leaves. In fact, if you water too much, you will have the same symptoms. If you water too much, it will lead to stagnant water in the basin. At this point, poinsettia roots will be lack of oxygen, and there may be rotten roots, which will cause the leaves to yellowing.

Solution: in the breeding of poinsettia, the need for reasonable watering, in the case of sufficient water to avoid stagnant water. If the phenomenon of rotten roots is found, the rotten roots should be cut off in time to avoid further infection.

4. Excessive illumination

Poinsettia can be said to be a short-day plant, in the appropriate light intensity, the leaf color will be more red, but the summer sun is too strong, if not timely ventilation, increase air humidity, it will cause plant wilting, leaves yellowing, leaf loss phenomenon.

Solution: in summer, poinsettia should be placed in a well-ventilated place, keep a distance of 50 cm between the basins, and often spray water to the ground to increase air humidity, which can effectively control the phenomenon of fallen leaves caused by high temperature and drying. Other seasons, can be normal light, but to avoid the cold wind blowing directly.

5. The temperature is too low

Poinsettia leaves yellow leaves, in addition to the above reasons, the temperature can not be ignored. It is understood that poinsettia is not cold-resistant, and the most suitable temperature for growth is 15-20 ℃. Once it is lower than 5 ℃, if it is not moved indoors in time, it will cause fallen leaves. In addition, if you open the window and blow a cold wind in winter, the leaves will fall off the poinsettia.

Solution: if the temperature is too low to cause the leaves of a poinsettia to turn yellow, the flower friends should raise the temperature appropriately in winter, keep the temperature constant, and keep the plant in a relatively stable environment.

6. Improper fertilization

Poinsettia likes fertilizer, and its growth needs all kinds of trace elements, especially nitrogen. If the nitrogen fertilizer is insufficient, the leaves of poinsettia are dim and yellow, and they are easy to fall off.

Solution: apply sufficient base fertilizer to the bottom of the basin when turning the basin every year. After pruning, apply thin cake fertilizer and water once every 7 days, topdressing before flowering, do not fertilize during flowering, otherwise the phenomenon of leaf bud anxiety will occur. Before entering the house in winter, apply a small amount of compound fertilizer to help it through the winter. Be careful not to fertilize too much so as not to burn roots.

As a novice, when many people first bought poinsettia, its leaves were still very green, but after a period of time, the leaves began to turn yellow. In fact, you failed to achieve the position. As long as we follow the above requirements, it is not a thing for the leaves to turn yellow. With regard to the yellowing of poinsettia leaves, this is the end of the editor's introduction, hoping to give you some help.

What if a poinsettia loses its leaves? what's going on?

Poinsettia is a very popular plant, the leaves are covered with bright red, it looks very festive. However, improper cultivation of poinsettia will produce leaf loss, leaf yellow phenomenon, the following together to understand the cause of leaf loss of poinsettia, find the cause of leaf loss, we can solve the problem of leaf loss of poinsettia.

What if a poinsettia loses its leaves (cause analysis) A poinsettia loses its leaves: the light is too strong.

Poinsettia like light, in the appropriate light intensity, the leaf color will be more red, but the summer sun is too strong, if not timely ventilation, increase air humidity, it will cause plant wilting, leaves yellow, leaf loss phenomenon.

So in summer, poinsettia should be placed in a well-ventilated place, keep a distance of 50 cm between the basins, and often spray water to the ground to increase air humidity, which can effectively control the phenomenon of fallen leaves caused by high temperature and drying. Other seasons, can be normal light, but to avoid the cold wind blowing directly.

Poinsettia leaves: the temperature is too low

Poinsettia is not cold-resistant, and the most suitable temperature for growth is 15-20 ℃. After winter, the temperature should be kept above 15 ℃, not less than 5 ℃. If it is not moved indoors in time, improper temperature control will lead to defoliation. In addition, if you open the window and blow a cold wind in winter, the leaves will fall off the poinsettia.

Since the low temperature is the reason for the fallen leaves of poinsettia, we should raise the temperature appropriately in winter, keep the temperature constant, and keep the plant in a relatively stable environment.

Poinsettia leaves: improper watering

Poinsettia like wet, but afraid of waterlogging, basin soil can not be too wet, if too much watering, the plant can not carry out good photosynthesis, poor plant growth will shed leaves. If watering too little, the plant will be physiologically short of water, and the leaves will curl and fall off a large number.

Therefore, poinsettia should be watered properly, not too much. It is usually watered every two days in spring. When the branches and leaves are luxuriant in summer, the plant grows faster and the water storage capacity is larger. It can be watered once a day to ensure sufficient water, and often sprinkle water to increase humidity. Outdoor farming, in case of heavy rain, it is necessary to keep out the rain in time.

Loss of leaves from poinsettia: improper fertilization

Poinsettia like fertilizer, the growth needs a variety of trace elements, especially nitrogen, nitrogen fertilizer is insufficient, the leaf color is dim, and easy to fall off.

Apply sufficient base fertilizer to the bottom of the basin every year when turning the basin. After pruning, apply thin cake fertilizer and water once every 7 days, topdressing before flowering, do not fertilize during flowering, otherwise the phenomenon of leaf bud anxiety will occur. Before entering the house in winter, apply a small amount of compound fertilizer to help it through the winter. Be careful not to fertilize too much so as not to burn roots.

Growing plants in real life is very long, and it takes a lot of time and energy, which tests everyone's patience. If you pay more attention to plants, the more beautiful they will grow and the brighter the flowers will come out.

What if the leaves of poinsettia are not red? the reasons why the leaves are not red and the solutions

Poinsettia is deeply loved by consumers because of its bright colors, long flowering period, moderate price and so on. But many flower friends report to the editor that poinsettia leaves are not always red. What is the reason for this? Below along with the wed114 wedding network editor to see how to do a poinsettia leaf is not red, to understand the reasons why the leaf is not red and the solution, as well as the introduction of breeding poinsettia.

The introduction of poinsettia

Poinsettia is a plant of the genus Euphorbiaceae, also known as the Christmas flower, is a red flower used to decorate at Christmas. A discolored foliage plant native to the Tasco region of Mexico.

Poinsettia is usually 60 cm to 3 m high and its dark green leaves are about 7 to 16 cm long. The top leaves are fiery red, red or white, so they are often mistaken for flowers, while the real flower is in the middle of the leaf bundle. The florescence lasts from December to February of the following year. The florescence is during the period of Christmas and New Year's Day, which is very suitable for the festive atmosphere.

Poinsettia can be used as a medicinal plant with the effect of promoting blood circulation and resolving phlegm, bone grafting and detumescence.

What if the poinsettia leaves are not red?

Reason 1. Lack of light for a long time

Solution: lack of light, poinsettia is not only not conducive to growth, but also easy to get sick, so can not see red bracts or small problems, there are no yellow leaves, rotten roots and other symptoms is lucky. Hurry up to move your poinsettia to a sunny place. I believe its red bracts will appear soon.

Reason 2. Not yet in bloom.

Solution: the flowering period of poinsettia can last from December to February of the following year. If its flowering period has not yet arrived, that is, it is in the growing period, the green leaves may continue to sprout, and flower friends will naturally see less red bracts.

Reason 3, insufficient fertilization

Solution: insufficient fertilization is fatal to the growth of poinsettia. Poinsettias that lack of fertilizer tend to be short and thin. Is Mamanet right? Hurry to give it some special plant fertilizer, which is good for its germination and growth to eat red bracts.

How to raise poinsettia

Many people don't know much about how to breed poinsettia. The leaves withered in a few days after poinsettia bought home. The following editor will introduce the breeding method of poinsettia.

Poinsettia is afraid of both drought and waterlogging. Therefore, each watering must be thoroughly watered, and then watered in time after the basin is dry, and foliar water should be sprayed frequently. Proper water control should be taken when breeding in winter.

2. Poinsettia has higher requirements for temperature, humidity, light, etc., too low and high temperature, lack of light, poor ventilation, or improper water and fertilizer will make the leaves yellow and fall off without flowering. Poinsettia short-day plants, to ensure the time of light during the day, at night to absolutely avoid light (including light), which is conducive to the formation of flower buds.

3. Poinsettia likes fertilizer. From August to October, it is mainly phosphate fertilizer, which is fertilized every 10 days. Alum fertilizer can also be used to promote the growth of bracts.

4. When potted poinsettia is planted, the plant height should be controlled at 40 Mel and 50 cm. Its height can be controlled by appropriate methods such as water buckling, fertilizer buckling, twisting branches, topping and so on.

5. 2 parts of garden soil, 2 parts of rotten leaf soil and 1 part of compost can be used as mixed substrate for potted poinsettia.

Potted plant conservation of poinsettia

In order to maintain poinsettia, it is necessary to do a good job in fertilizer and water management, control, warmth and cold protection during the growing period.

Watering should be paid attention to evenly, to prevent too dry and too wet, otherwise it will cause the lower leaves of the plant to yellowing and falling off, commonly known as "off-foot", or uneven branch growth. In Huangmei season and summer showers, it is necessary to prevent stagnant water in the basin, pour water into the side basin in time after the rain, or move it indoors with the basin before the rain. Hot summer weather, water demand, every morning enough water, evening observation, if found that the basin soil is dry, should supplement watering, this time the amount of water can be less. Spring and autumn season generally 1-2 days watering, depending on the weather and basin soil dry and wet.

The work of mid-ploughing and fertilization can not be ignored. After 2-3 weeks on the pot, small bamboo slices can be used to loosen the basin soil to make the soil circulate, and then some liquid fertilizer can be applied, using 20% rotten human feces and soybean water. From the middle of August to October, it is necessary to increase the number of fertilization, about once every 10 days, and appropriate Qingchuan. Several Shenhui fertilizer, the concentration can also be slightly thicker, with 30% cooked chicken, duck, pigeon dung water. It can promote its full growth when forming buds.

Poinsettia on the basin, the growth is faster, it is necessary to control the fixed head, otherwise the branch growth is too high, the wind is easy to fall, and affect the beauty of posture. The fixed head can be divided into straight head or Zha Jing according to the need. Straight head in the form of the last time in June after the head, so that branches have been growing, can grow to a height of 60-70 cm large plants. While Zha Jing needs to cut into a section of 15-20 cm with lead wire when the growth reaches 10-15 cm, the upper end is bent into a hook shape, the lower end is inserted into the potted soil, and the upper end hooks each branch down to the basin surface from L to the basin surface. After about 10 days, the branches continue to grow into about centimeters, and then the branches are lured along the edge of the basin horizontally. After 10 days, the branches that have reached the edge of the basin are guided upward. From mid-September to late October, each flower head is tied up with a thin bamboo pole 30-40 cm long, and if the branches are high or low, they can be arranged, high ones down and low ones up. This method costs more than L, but it can make the potted flowers neat. Many dwarf varieties of poinsettia introduced from abroad can achieve the goal of short plant, large flower and neat flower head as long as it is controlled by fixed head.

Poinsettia in the middle of October every year, that is, Frosts Descent Qianren indoor maintenance, too late will be frozen, too early indoor temperature is high, will make the plant grow too much. When you first move indoors, put it in a ventilated place; by the middle of October, it should be placed in a warm place facing south and sun, so as not to be hit by the cold wind, so as to prevent the leaves from falling off. Generally in early and mid-December, poinsettia tip leaves turn red, set off by green leaves, appear particularly red.

Disease control of poinsettia

I. Diseases

There are mainly stem rot caused by fungi, gray mold and leaf spot caused by bacteria. In addition to spraying fungicides regularly, it is also necessary to do a good job of ventilation and humidity reduction in the greenhouse to reduce pathogens, and tools should be disinfected in time to prevent cross-infection. and clean up the diseased plants in time to reduce the source of infection. In winter, sulfur fumigators or sulfur-containing smoke bombs can be used to kill fungal spores in the air.

Poinsettia is easy to be infected with Botrytis cinerea, root rot, stem rot, leaf spot and other diseases and insect pests in greenhouse cultivation, there are many targeted studies at home and abroad.

1. Grey mold

It mainly occurs in winter, when poinsettia blossoms. In case of continuous rain, damp and no sun, it can damage inflorescences, bracts, leaves and branches of poinsettia. Generally speaking, water-immersed disease spots begin to appear from the tidbits. After that, the disease spot was covered with a robe of pathogens, and the pathogens continued to spread to the bracts. At the initial stage, the bracts produced water-immersed discolored spots, and then gradually expanded into irregular shapes, and the pathogens extended to the branches, producing yellow-brown to brown spots on the branches. in the later stage, the disease spots were obviously sunken black-brown, and in severe cases, the disease spots were dry and completely lost their ornamental value. The pathogen is Botrytis, which can live on dead plant tissue or other organic matter and has a wide range of parasites. It can survive at a temperature of 0: 38 ℃, and it exists as long as there is moisture. If the greenhouse is too humid, cold and lack of light, after 1-2 days, the pathogens will produce a large number of robes free in the air and begin to infect plant tissue.

2. Root rot and stem rot

It can be infected as an adult plant or in the seedling bed stage, resulting in serious losses. Generally, the occurrence is more serious in the high temperature season, and it is also very easy to occur when the cultivated soil water content is high. The phenomenon of wilting appeared in the early stage of the plant, but if the base of the stem was examined, the phenomenon of light brown constriction could be seen, but there was no corruption or hydrolysis in the infected plant, and then the disease spot gradually spread upward, and the wilting phenomenon became more and more serious. the disease spot in the stem was slightly sunken and yellowed in the later stage, resulting in the withering and death of the plant due to serious lack of water, and sometimes the whole plant was yellowed in water. It eventually decays and dies, and white hyphae can be seen near the ground, which can be extended to the cultivated soil in severe cases. When the root is sick, it often causes root rot, which affects the normal growth of the plant at the initial stage and leads to death in serious cases. The main pathogens are Phytophthora (Phytophthora), Rhizoctonia solani (Rhizoctonia), Pythium (Pythium) and so on. Rhizoctonia solani is the most vulnerable to Rhizoctonia solani when rooting cuttings are put on the pot, especially when the stem is injured or fertilizer! When salt accumulates on the surface of the medium

3. Pythium

Poinsettia appears when it is grown up, it may have invaded at the time of cutting, and deteriorated when the environment is suitable for reproduction, resulting in root rot and death; high temperature and excessive irrigation (stress conditions) can cause Phytophthora damage.

4. Leaf spot

It mainly occurs in spring and summer, and most of the disease spots begin to occur in the old leaves. In the early stage, purplish red to brown spots were produced on the leaves, and the disease spots were nearly round to irregular, and then the disease spots gradually expanded, and most of the disease spots could heal each other to form a large disease spot, and in the later stage, the center of the disease spot gradually changed to grayish brown. In severe cases, the lesion tissue is gangrenous, causing the leaves to twist and dry up. The pathogen was Cercospora.puleherrimaeTherp., transmitted by Rain Water and wind, and invaded by leaf margin or wound.

II. Insect pests

The most common is whitefly, which can be sprayed or rooted with insecticides. Taking advantage of the phototaxis of whitefly, a yellow armyworm board coated with engine oil is placed in the greenhouse to trap and kill it. In addition, it should be noted that whitefly generally sucks juice on the back of young leaves, and light-colored leaves are more likely to cause whitefly damage. The main pests of poinsettia are whitefly, leaf mite, thrips and so on.

1. Whitefly

The adults and larvae of whitefly prefer a dense shady environment and cluster on the upper leaf back of poinsettia to suck juice with prickle mouthparts, which makes the leaves fade or appear chlorotic spots, affecting photosynthesis and leading to poor plant growth. Honeydew excreted by worms often causes mildew. Adults have a yellowing tendency. The Eclosion time began at 6 o'clock in the morning, with the highest Eclosion at 7: 8 am and the lowest at night. The first instar mobile larvae of whitefly are the most vulnerable, followed by rigid Eclosion adults, which are sensitive to pesticides and suitable for spraying control. Whitefly generally occurs in large numbers at high temperature and low humidity, and the peak period is from late September to late November. The most suitable period for prevention and treatment is late September, and the spraying time is 6 ~ 10:00 in the morning.

2. Leaf mite

Leaf mite, also known as red spider, is a common pest in greenhouse. It occurs for more than 20 generations in the whole year, which occurs seriously under the condition of high temperature, drought and little rain, and the peak periods are from March to June and from September to November. Mites or nymph mites like to live on the back of the old leaves, the damaged leaves have yellow spots, examination of the back of the leaves can find insect bodies, eggs, silk mesh and secretions and other sundries. A large number of netting damage occurred, resulting in stagnation of plant growth, leaf drying, falling, and plant death.

3. Thrips

The body length of thrips is only about 1~2mm, and its harm can be found in the leaves or flowers of almost all greenhouse plants. But under normal circumstances, the harm to poinsettia is not very serious. Adult and nymphs are yellowish or orange and harm plants with file-sucking mouthparts. The damage sites include buds, leaves, flowers, etc., especially the tender leaves and shoots suffer the most, resulting in plant dysplasia, which can be identified as the damage characteristics of thrips by the white markings on both sides of the main veins of the leaves. Damage to the leaves causes white or brown markings and, in severe cases, distorts the leaves. Flowers suffer and deform. Yellow armyworm paper is effective against adult thrips, but blue and white armyworm paper is better.

4. Whitefly

The key to control whitefly is to avoid the emergence of large populations. White whitefly adults are attracted by bright yellow, so yellow sticky trapping paper is useful for detection. There are many drugs to control whitefly in various places, such as "prolactin", "highly effective hero" and so on, which can be tried. It should be noted here that before using a new drug in a large area, a drug damage test must be done to confirm that the dose used will not cause drug damage to the plant and then be used on a large scale.