The solution to the cause of losing leaves in poinsettia

Poinsettia

Poinsettia belongs to both flowering plants and foliage plants. Its leaves are emerald green and the flowers are Chinese red, which makes people feel very festive, so poinsettias are used in some large celebrations to decorate the scene. However, poinsettia will have the problem of falling leaves if it is not properly maintained, if it does not pay attention to it, it will seriously affect its ornamental value, so what should be done when poinsettias lose their leaves?

1. The light is too strong

Poinsettia should not be exposed to strong light in summer. If the sun is too strong and the ventilation is not good, it is easy to lose the leaves of poinsettia due to high temperature drying.

Solution: in summer, poinsettia plants should be placed in a well-ventilated place, the distance between pots and pots should be kept at a distance of 50 cm, and water should be sprayed frequently on the ground, which can increase the humidity of the air and effectively control plant defoliation caused by high temperature and dryness.

two。 The temperature is too low

Poinsettia prefers warm, humid, cool climate, not cold-resistant, suitable for growth of 15-20 ℃, winter night to maintain more than 15 ℃, not less than 5 ℃, otherwise the leaves are easy to fall off. If you open a window and blow a cold wind in winter, it will also lead to a large number of fallen leaves.

Solution: too low temperature is the main reason for the fallen leaves of poinsettia, so it is better to keep poinsettia in a higher temperature and stable environment in winter.

3. Too much watering

Poinsettia is afraid of dryness and waterlogging, the basin soil is too wet, plant canopy density is large, photosynthesis can not be carried out well, resulting in malnutrition and fallen leaves.

Solution: if poinsettia is properly watered, not too much, such as drainage in case of heavy rain, or move the pot plant into the room before the rain.

4. Too little watering

Poinsettia likes to be wet, if it is too dry and meets the hot sun, it will make the plant physiologically short of water, then the leaves will curl and a large number of fallen leaves.

Solution: poinsettia is watered every 2 days in spring. When the branches and leaves are luxuriant and growing fast in summer, the amount of water should be large and sufficient water should be provided.

Poinsettia

5. Improper fertilization

Poinsettia likes fertilizer, needs more nitrogen fertilizer in the growing period, and the lack of nitrogen fertilizer will make the lower leaves of the plant fall off.

Solution: in addition to the base fertilizer applied on the basin, the thin pancake fertilizer and water that has been mellowed should be applied every 7 days or so within a month after picking the heart, not too much fertilizer should be applied during flowering, otherwise the phenomenon of leaf bud anxiety will occur. 40% fermented human feces can be applied before entering the house in winter.

6. Disease and insect damage

Poinsettia is affected by red spiders, whitefly, black spot, deciduous disease, anthrax and other damage, plants often have fallen leaves. Air pollution: indoor due to coal stove, coal combustion gas, affecting the growth of flowers, for a long time, the leaves will fall off.

7. Metro metabolism

As the saying goes, "autumn wind and fallen leaves", poinsettia will have fallen leaves and enter the dormancy period like other plants in autumn. There is no need to worry about this situation. This is a metabolic reaction of plants in the new city. Just like people, when they change seasons, their hair will fall a lot.

Usually do a good job in the basic maintenance of reasonable light, timely water and fertilizer, disease and pest prevention basically will not have any big problem, poinsettia is relatively easy to raise, flower friends with a snack to finish!

Analysis of common causes and solutions to the loss of leaves in poinsettia

Poinsettia is a very unique ornamental plant, the top red leaves appear to be very festive, so many people will choose a pot to decorate their homes on holiday. But in the process of breeding poinsettia will lose leaves, then poinsettia leaves how to do? The following editor tells you the reasons and solutions for the loss of leaves in poinsettias.

What if a poinsettia loses its leaves?

Reasons: 1. Excessive illumination.

Poinsettia should not be exposed to strong light in summer. If the sun is too strong and the ventilation is not good, it is easy to lose the leaves of poinsettia due to high temperature drying.

Solution: in summer, poinsettia plants should be placed in a well-ventilated place, the distance between pots and pots should be kept at a distance of 50 cm, and water should be sprayed frequently on the ground, which can increase the humidity of the air and effectively control plant defoliation caused by high temperature and dryness.

Reason: 2. The temperature is too low

Poinsettia prefers warm, humid, cool climate, not cold-resistant, suitable for growth of 15-20 ℃, winter night to maintain more than 15 ℃, not less than 5 ℃, otherwise the leaves are easy to fall off. If you open a window and blow a cold wind in winter, it will also lead to a large number of fallen leaves.

Solution: too low temperature is the main reason for the fallen leaves of poinsettia, so it is better to keep poinsettia in a higher temperature and stable environment in winter.

Reasons: 3. Too much watering

Poinsettia is afraid of dryness and waterlogging, the basin soil is too wet, plant canopy density is large, photosynthesis can not be carried out well, resulting in malnutrition and fallen leaves.

Solution: if poinsettia is properly watered, not too much, such as drainage in case of heavy rain, or move the pot plant into the room before the rain.

Reasons: 4. Too little watering

Poinsettia likes to be wet, if it is too dry and meets the hot sun, it will make the plant physiologically short of water, then the leaves will curl and a large number of fallen leaves.

Solution: poinsettia is watered every 2 days in spring. When the branches and leaves are luxuriant and growing fast in summer, the amount of water should be large and sufficient water should be provided.

Reasons: 5. Improper fertilization.

Poinsettia likes fertilizer, needs more nitrogen fertilizer in the growing period, and the lack of nitrogen fertilizer will make the lower leaves of the plant fall off.

Solution: in addition to the base fertilizer applied on the basin, the thin pancake fertilizer and water that has been mellowed should be applied every 7 days or so within a month after picking the heart, not too much fertilizer should be applied during flowering, otherwise the phenomenon of leaf bud anxiety will occur. 40% fermented human feces can be applied before entering the house in winter.

What if the leaves of poinsettia turn yellow?

1. Control watering

Most of the yellow leaf problems are caused by too much watering, and the stagnant water in the basin makes it difficult for the roots of poinsettia to get enough oxygen. Therefore, from the moment the yellow leaves are found, reduce the amount of water until you see the basin soil turn white and then water it.

2. Cut off the rotten root

Poinsettia and yellow leaves are generally only superficial, and the decay of its roots is the internal cause. Therefore, the root system of poinsettia should be properly turned out for observation. If rotten roots are found, they should be cut off in time to prevent bacteria from continuing to infect other parts.

3. Pry up the soil

Pry up the basin soil with a small shovel to increase the evaporation of water and the infiltration of oxygen, which is absolutely beneficial to the improvement of the symptoms of poinsettia yellow leaves.

4. Strengthen the lighting

Although poinsettia is a short-day plant, if there is no light for a long time, the leaves not only will not remain green, but also easy to yellowing. The right thing to do is to move the pot to a place with plenty of light immediately to promote photosynthesis.

5. Increase the room temperature

Keeping the room temperature above 15 ℃ in winter and increasing the heating will be beneficial to the growth of poinsettia and the symptoms of yellow leaves should be greatly alleviated.

The loss of leaves and yellowing of leaves is a common problem in the maintenance of poinsettia, which needs to find out the reasons for the corresponding solutions. Poinsettia is a plant that watches leaves and flowers, and if the leaves fall, it will affect the ornamental value of poinsettia. so we should pay attention to conservation.

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.