What if the leaves of the eight Immortals turn yellow, and increase the light to regulate the temperature / spraying of diseases and insect pests

Eight Immortals, also known as Ziyang Qinhua, Hydrangea, it originated in the Ming and Qing dynasties, has a high ornamental value. The eight immortal flowers are luxuriant, magnificent, elegant, white and plump, large and beautiful, pleasing to the eye and spirit, is a common ornamental shrub plant. The lenticels are obvious, and the leaves are large and thicker. The following editor will explain for you how to prevent the leaves of the eight Immortals from yellowing.

I. the causes and solutions of the yellowing of the leaves of eight Immortals.

1. Keep the acid soil

Baxian flower is suitable to grow in acidic soil, because its acidic plants contain a lot of iron, which can meet its nutrient needs. If growing in alkaline soil, it is easy to lead to acid-base imbalance, the color of the leaves will gradually turn yellow. When the soil is acidic, the flowers are blue; when the soil is alkaline, the flowers are red.

Irrigate ferrous sulfate solution or potassium dihydrogen phosphate solution once every 10-20 days to ensure that the soil is acidic. Or directly pour 150-250 times of edible rice vinegar diluent, 3-4 times can be effective. When planting or changing the soil, adding sulfur powder to the soil can ensure that the soil is acidic and its validity can be maintained for 2-3 years.

2. Keep the right temperature

The eight Immortals like a warm, semi-overcast environment. The suitable temperature can prolong the viewing time of Baxian flower. The suitable temperature for its growth is 18-28 ℃, and the winter temperature is not lower than 5 ℃. The high temperature easily fades the color of the eight Immortals.

3. Get dry and wet properly

Eight Immortals like a relatively humid environment, too much watering, basin soil stagnant water and lack of oxygen, easy to cause root rot, leaves turn yellow. Too little watering makes it difficult to absorb water at the bottom, thus turning the leaf tip yellow.

It is easy to loosen the soil when watering too much, and then pour a small amount of water when the soil dries to keep the soil moist. When watering too little, you can first pour a small amount of water, at the same time sprinkle some water into the air to keep the air moist.

4. Correct fertilization

The eight immortal flowers apply too much fertilizer or apply raw fertilizer, which is very easy to burn roots, resulting in yellowing leaves. If the eight Immortals are fertilized too little or have not changed the soil for a long time, the plant growth is lack of nutrients, and the leaves are easy to turn yellow.

When fertilizing too much, a small amount of water should be irrigated, or the soil should be changed and replanted. If there is too little fertilizer, some fertilizer should be irrigated properly to ensure the normal growth of plants.

5. Lighting requirements

The eight Immortals prefer yin to yang. When you move outdoors in spring, you should keep the plants in a semi-shade and keep the plants in a well-ventilated shade in the middle of summer to prevent sunburn. After September, the light weakens, and the plant is placed in a bright place to promote the differentiation of flower buds.

6. Pest control

The disease is the attack of wilt and leaf spot, which requires 65% Dysen zinc wettable powder 500 times liquid spray to control. Insect pests are mainly aphids, which can be washed with folk prescription and cigarette butt soaking water, which is more effective, or sprayed with 1500 times omethoate EC.

With regard to the yellowing of the leaves of the eight Immortals, this is the end of the introduction. If you still have anything you don't understand, you can learn about the relevant knowledge on the Internet. I hope the explanation of the editor today can bring some help to you.

What if the leaves of Hydrangea turn yellow?

Hydrangea, also known as eight Immortals, has large white flowers with red and blue colors. When the flowers are in full bloom, they are pleasing to the eye and refreshing. As a common potted ornamental flower and tree, hydrangea is also planted in most parts of our country. But many people wonder, hydrangea leaves are easy to yellow, hydrangea leaves yellow how to do? The following editor will introduce you.

What if the leaves of Hydrangea turn yellow?

The yellowing of hydrangea leaves is mainly caused by light, watering, ventilation, diseases and insect pests.

Hydrangea lighting requirements is the whole sun, do not shade, only in the summer high temperature period of strong light shading 30-50%, to prevent leaf burns, other periods do not shade, otherwise easy yellow leaves.

Hydrangea should be watered evenly, and then watered thoroughly when the surface of the basin soil is dry. Do not keep the basin soil moist, let alone stagnant water or drought. Otherwise, there will be a large number of fallen leaves, especially the old leaves in the lower part fall off obviously.

At the same time, the good ventilation of hydrangea is a very key link, and the yellow leaves are easy to fall off at the closure of the canopy.

In addition, do not fertilize hydrangea too much at one time; if your hydrangea plant height is about 40 cm or higher, and the lower leaves have fallen off, you can put it in a place with sufficient light, and then strengthen fertilizer and water management. after a week, each branch will be short and rejuvenated, each branch will only retain about 5 cm, (pay attention to keep the plant shape beautiful, the pruned branches into mushrooms or round good-looking). More branches will sprout, and this method will increase the number of flowers because the hydrangea blossoms at the top of the new branch. And the pruned branches can also be cut in plain sand, so it is easy to take root.

Growth habits of Hydrangea

Hydrangea originated in China and Japan. Like warm, moist and semi-overcast environment. The suitable temperature for the growth of Hydrangea is 18-28 ℃, and the winter temperature is not lower than 5 ℃. Flower bud differentiation takes 6-8 weeks under the condition of 5-7 ℃. The temperature of 20 ℃ can promote flowering, maintain 16 ℃ after anthesis, and prolong the flowering period. But the heat makes the flowers fade quickly.

Hydrangea pot soil should be kept moist, but watering should not be too much, especially in the rainy season to pay attention to drainage to prevent root rot caused by waterlogging. Indoor potted hydrangea in winter should be slightly dry. If it is too wet, the leaves will rot easily.

Hydrangea is a short-day plant, which is treated in the dark for more than 10 hours every day, and flower buds are formed in about 45-50 days. In peacetime, cultivation should avoid the hot sun, and 60%, 70% shade is the most ideal.

The soil of hydrangea should be loose, fertile and well-drained sandy loam. However, with the change of soil pH, the flower color of hydrangea changed greatly. In order to deepen the blue, aluminum sulfate can be applied during bud formation. To keep pink, lime can be applied to the soil.

The above is a simple summary of how the leaves of hydrangea turn yellow. Hydrangea is not only beautiful in shape, but also attractive in design and color. Planting a plant at home can not only make the environment beautiful, but also symbolize the beautiful meaning. During cultivation, we should pay attention to the environment where hydrangeas like sun, warmth and semi-shade, and pay attention to the regulation of humidity and ventilation at any time.

Pot culture methods and control techniques of main diseases and insect pests of Baxian flower

How to raise the eight Immortals and when to blossom? Today's main content we will discuss bonsai eight immortals pot planting technology and reproduction methods, such a beautiful eight immortals, how can florists miss it?

1 reproduction

The propagation of eight Immortals often uses the methods of ramet, striping, cuttage and so on.

1.1 ramet propagation

It should be carried out before the germination of new branches in early spring. First, the mother plant is poured out from the basin, most of the old culture soil is removed, the extension direction of the new bud and sprouting root system is exposed, the outer dead root and the old root are removed, and the root system that is opened and knotted together is decomposed, so as to hurt the root as little as possible. the connected part of the tiller seedling and the mother plant was cut with a sharp knife, and then planted and managed separately, that is, an independent plant.

1.2 striping propagation

It is usually carried out before the plum rain. The sturdy, semi-lignified and pest-free branches were cut to the phloem with a 360 °ring with a sharp knife, and then the skin was peeled off with a ring width of 3 times the branch diameter. the cut was wrapped in moist moss, peat or culture soil with plastic film, wrapped into a spindle, and fastened up and down. If the wrapped matrix becomes dry and whitish, you can use a syringe to replenish water. Under the appropriate temperature and humidity, it can take root in about 1 month. After 3 months, it can be cut off from the mother, removed the plastic film, put on the basin, and fine management can be used to cultivate independent plants.

1.3 Cuttage propagation

The best period of cutting propagation is from May to June, combined with pruning and post-anthesis shaping. Select twigs, semi-lignified or lignified branches without disease and insect pests, grow 8~10cm, keep the top 2 leaves and cut off their 1 / 2 / 2 / 3 respectively, soak about 30min in 250mg/kg ABT rooting solution, then punch holes with bamboo sticks and insert them into the planting bed with garden soil, river sand, vermiculite or perlite (proportion is 6:2:2) as substrate, properly shade, keep the bed soil moist, pull out weeds in time, and start sprouting in half a month or so. After that, the frequency of water spraying was gradually reduced and the light was increased, and it could be transplanted in about 1 month.

2 cultivation and management

2.1 Matrix

Eight Immortals like loose, fertile, well-drained loam. In winter, sawdust, pig and cow dung, peat and garden soil can be well mixed and put into full maturity before use. The flower color of Baxian flower is greatly affected by the acidity and alkalinity of soil. most of the flowers in acidic soil are blue and those in alkaline soil are red.

2.2 transplanting and plastic surgery

After transplanting, the seedlings should pay attention to moderate shading and irregularly spraying water on the leaves in order to slow down the seedlings. When the new branches grow to about 8cm, they should be coring, promote branches, remove dense branches and overlapping branches in time, and leave 3-5 branches, so as to form a better plant shape.

2.3 temperature

The suitable temperature for growth was 15-27 ℃. It is not allowed to overwinter in the north of the Yangtze River, and it is necessary to move to a greenhouse of more than 5 ℃ in winter to avoid freezing damage. In the hot summer, the temperature can be reduced by appropriate shading, strengthening ventilation, foliar spraying and other measures.

2.4 Lighting

The eight Immortals are short-day plants with a dark time of more than 10 hours a day and about 6 weeks to form flower buds. Baxian flowers like the semi-shady environment, too strong light will cause the leaves to fade green and white, and even cause leaves to burn and scorch. Under moderate light, the plant grows healthily and the leaf color is thick green. It is hot and hot, and 70% shading net is used for shading. Sunny day, pull up the sunshade net at about 10:00 in the morning, open the sunshade net at about 4 pm; remove the sunshade net completely on overcast and rainy days. Note that when removing the sunshade net, it should be removed gradually to avoid discomfort caused by abrupt changes in light.

2.5 watering

Watering should not be too frequent, and it is appropriate to keep the soil moist regularly. When it is dry and hot in summer, it can spray water to the leaf surface, reduce the leaf temperature and slow down the water transpiration rate. Watering in winter follows the principle of "dry and wet". Watering is controlled and semi-dry is maintained during dormancy. The water requirement of the plant will increase significantly before and after budding, so it is appropriate to water it once or twice a day in the early morning and evening.

2.6 fertilization

During the growth period, rotten cake fertilizer and water were applied every 10 to 15 days, and 0.1% urea or 0.1% ferrous sulfate solution was sprayed every 15 days or so. During flower bud differentiation, the application of P and K fertilizer was increased moderately. Stop fertilizing during dormancy.

2.7 Control of major diseases and insect pests

2.7.1 Leaf spot

The main damage to the leaves, the disease spot round to polygonal, brown or dark gray, the edge of purple-brown or nearly dark brown. At the initial stage of the disease, 65% Dyson zinc wettable powder 500 times or Bordeaux solution was sprayed once every 10 days for 2 times.

2.7.2 Rust

The main damage to the leaves, the leaves appeared a large light yellow to rust-brown spore pile, the diseased leaves withered and broken. During the onset season, 15% vermicellin wettable powder was sprayed 800 times every 10 days for 2 times 3 times.

2.7.3 blight

It mainly harms the leaves and stems, and the leaves near the ground produce watery chloasma, which spreads to the stems, causing the leaves to dry up and the stems to turn black and rot. In the initial stage of the disease, 75% chlorothalonil 800 times or 50% thiram wettable powder 500 times were sprayed every 10 days, even for 2 times.

2.7.4 powdery mildew

It mainly harms the leaves and can infect the stem in severe cases. The leaf surface shows a light gray mildew layer, and then gradually becomes light brown. During the onset of the disease, the patients were sprayed with 1000 times of the wettable powder or 70% methyl topiramate wettable powder, once every 7 days, for 2 times in a row.

2.7.5 scale insects

It mainly harms young stems and leaves, resulting in yellowing leaves and dry branches. When the insect pest is light, it can be brushed off gently with a soft brush, and then rinsed with water. When using insecticides, it is best to spray 1000 times of dichlorvos or 50% fenitrothion EC during the nymph incubation period.

2.8 other

Strict quarantine should be strengthened to prevent diseased plants from entering the nursery. Pay attention to environmental hygiene at any time, remove the surrounding weeds in time, and strengthen ventilation and light transmission. Remove the diseased leaves, pull out the diseased plants and destroy them in time.

(3) promoting cultivation

Baxian flower is a short-day plant, the dark time is more than 10 hours every day, and when the night temperature is 10-20 ℃, the flower bud can be formed in about 6 weeks. After the completion of flower bud differentiation, watering is gradually reduced to facilitate the full maturity of branches. Remove the leaves and move them into the cold room, control water and fertilizer, maintain the semi-dry state, promote its full dormancy, and facilitate cultivation after 6-8 weeks. In the initial stage of cultivation, the temperature should not rise to too high rapidly, it should be heated to 13: 15 ℃, 3: 5 days, and then gradually increased to about 20 ℃, and maintain sufficient light, moist soil, high air humidity. When the flower bud is visible and the inflorescence is elongated, the temperature is quickly reduced to about 16 ℃, the air humidity is reduced, and the flower can blossom in about 3 weeks. It is necessary to maintain sufficient moisture and light during flowering. The flowers of the eight Immortals are large and large. In order to avoid drooping or lodging during flowering, they can be supported by brackets to maintain their high ornamental effect.

So much for the above bonsai eight immortal flower pot planting technology. If you think it's not bad, you can continue to pay attention to Huinong net!