White orchids suffer from yellowing disease how should do?

White orchid likes acidic soil, and its yellowing disease is caused by alkaline soil or irrigation water. The symptoms are yellowing of leaves, blackening and decay of roots. The prevention and control method is to spray wine leaves with 0.2% ferrous sulfate solution. Spray once every 5 to 7 days, and 0.5% ferrous sulfate solution can be applied frequently.

If you want to know what to do with white orchid worms, first of all, we have to understand what kind of insects grow, so that we can deal with them pertinently, because the prevention and control methods of each kind of diseases and insect pests are different. Below, there are all kinds of pest control methods of white orchids. Friends who have similar problems or not can learn about it. After all, we should guard against it.

II. Disease and pest control of white orchids

Insect pest

1. Red wax scale

The red wax scale is a relatively high incidence of diseases and insect pests in white orchids. It mainly absorbs the juice of the plant, and its excreta will also lead to coal fouling disease, resulting in a layer of black mold on the leaves, leading to the gradual weakening of white orchids. In serious cases, it may even cause it to fail to bloom.

Control method: in the control of this pest, we can use 1000 times of imidophos EC to spray the white orchid, we can spray once every 4-6 days, after three consecutive sprays, we can basically eliminate this pest.

two。 Red spider

Among the diseases and insect pests of white orchids, red spiders also have a relatively high incidence, and its high incidence period is around May every year, so we must pay special attention to it at this time. If this pest occurs in your white orchid, its leaves will gradually turn yellow and white, and finally wither gradually.

Control method: when controlling the pest of red spider, we can spray it with 2000 times EC, and after spraying, we have to disinfect the white orchid to avoid residual germs.

3. Blown cotton scale

Blow cotton scale is a kind of pest of Homoptera, this kind of pest is harmful to many plants, white orchid is also one of them, blow cotton scale mainly harms the leaf buds and branches of white orchid, it will gradually cause leaves yellowing, branches fall off, the whole white orchid will die in the eyes, which shows the great harm of cotton scale among the diseases and insect pests of white orchid.

Control method: in the prevention and control of this pest, if it is not serious, we can cut off the branches and leaves with eggs, of course, we can also use the most direct method, directly use 40% omethoate 1000 times liquid to spray it.

Disease

1. Anthrax

Among the diseases and insect pests of white orchids, anthracnose is a more common one. When the disease occurs, there will be many round brown spots on the leaves of white orchids, the size of which is 2-8mm, which will gradually spread over time, and finally lead to plant rot.

Prevention and treatment: in the prevention and control of this disease, we can use 70% anthrax Fumei 600 times solution to spray the diseased plants, usually once every 10-15 days, and then recover after 2-3 times.

two。 Chlorosis

Chlorosis is not as frequent as the above diseases and insect pests in white orchids, but it also has a certain probability. When this disease occurs, the leaves of white orchids will gradually lose green, and the leaf color will gradually change from green to yellow, and finally from yellow to white. In severe cases, the whole leaves will dry up and fall off.

Prevention and control methods: in the prevention and treatment of chlorosis, we can use the yellow leaf fast green plant antiviral compound nutrient solution of 500 times to spray the plant, once every 7-10 days, 2-3 times in a row can be cured.

Conclusion: after reading the above, I believe we all know how to solve the problem of white orchid worms. In fact, this kind of problem is mainly caused by improper maintenance. We still need to take a look at the cultivation methods of white orchids when we have time. There is a detailed conservation teaching. This is the end of the editor's introduction to the problem of pest control of white orchids. I hope I can help you all.

How to grow white orchids? White orchid cultivation techniques and pest control methods!

The white orchid has a long flowering period and thick green leaves, so it is a popular garden ornamental and green seedling, so do you know how to grow the white orchid? Do you know how to control diseases and insect pests of white orchids? Do not know quickly Huinong net editor to have a look, the following timely Huinong net Xiaobian finishing the prevention and control of white orchid diseases and insect pests!

Ecological habits of white orchids:

White orchids like warmth and are not resistant to cold. The northern potted plant should be moved indoors in winter and placed in a sunny place. The chamber should be kept above 12 ℃, and 15 ℃ is the most suitable. Under this temperature, the leaves can be kept. If the cold causes the leaves to fall in winter, it will affect the flowering the following year. White orchids like sunshine and cannot bear shade. When the weather gets warmer in spring, move it outside and put it in a sunny place. The summer climate is hot, the air is dry, can be properly shaded, and fully watered and sprayed.

White orchids like water, can not bear to dry early, afraid of waterlogging. If the leaves are found to be red, it means that the root system has been damaged by water, and it is necessary to stop or reduce watering, otherwise it will cause fallen leaves. Water less when it is cool in autumn. In order to prevent stagnant water, you can pad some broken bricks and tiles at the bottom of the basin to facilitate drainage and avoid rotten roots and yellow leaves.

White orchids like acidity, and acidic or slightly acidic sandy loam is suitable for soil. Although most of the soil or water in the north is alkaline, it is easy to cause poor plant growth and yellowing of leaf color. In this case, to reduce watering, while using black alum water to water flowers, can gradually eliminate the yellowing phenomenon, so that the leaf color slowly turn green.

White orchids like fertilizer and water, and can be watered with alum every 4-5 days in the growing season, usually in the afternoon and then in the evening to dilute the fat and water to disperse the root heat and prevent root burning. Fertilization has been stopped since August. White orchids sprout twice a year. The first time in spring, the second time in summer. Branches can grow more than 50 centimeters a year. Before the second germination, there is a period when the branches stop growing. At this time, it is necessary to maintain sufficient light and strengthen fertilizer and water management to promote the second germination. Generally speaking, the mature bean cake can be watered once every 3 or 4 days, so as to achieve the purpose of blooming at the same time.

Cultivation and management skills of white orchids:

White orchids are not resistant to pruning and maintain their natural state in principle. In summer, attention should be paid to timely cutting off overgrown roots and dead branches in order to maintain a beautiful tree shape and reduce nutrition consumption.

The work of coming out of the room of white orchids is very important. When the weather is getting warmer from winter to spring, evaporation increases significantly in the northern region because of the dry climate. If the white orchid is poorly managed in winter and its roots are damaged and moved out in a hurry in early spring, it will make a large number of leaves fall off, branches shrink, or cause death. When you find this kind of situation, you must not rush out of the room, first restore the root system indoors, wait for the branches and leaves to grow vigorously, and then gradually move out. Summer should be put on the benefits of good ventilation, because the climate is dry and hot, poor ventilation, it is easy to cause red spider plant harm and disease.

The pots of white orchids are changed every 1-2 years, mostly before leaving the room from March to April. The soil uses acid sandy loam with loose and fertile soil and good drainage.

White orchids are often propagated by grafting. The time is from May to August. Magnolia is used as rootstock and one-year-old branches are used as scions. It can be cut in about 40 days. It can also be propagated by striping. Cuttage propagation is not easy to survive, so it is not often used.

Control methods of diseases and insect pests:

The main diseases and insect pests of white orchids are Rhizopus, aphids and shell insects.

(1) Rhizopus: mildew and white hairs on the roots. The main reason is that the basin soil is too wet. The root soil can be removed to reveal the root of the disease, and then removed with gypsum powder to sterilize. It can also be poured with light lime water after the basin soil is slightly dry.

(2) aphids, sprouting in spring is often harmed by aphids. Aphids are very small and adults have or do not grow wings. The reproduction is very fast, and the harm is serious. It has piercing and sucking mouthparts, which usually gather on branches, leaves, buds or pedicels, absorbing sap from tender tissues, causing branches and leaves to wrinkle and deform, flowers growing poorly or not fully blooming. The honeydew it secretes from time to time cultivates a kind of coal fouling bacteria, which spreads virus disease and many other hazards, and produces a layer of black cover in the damaged branches, affecting normal photosynthesis and ornamental value. The control method is to ensure that the plant is ventilated and transparent, and the foliar surface is often sprayed with boiling water. Aphids can be sprayed with 800x fenitrothion or 2000 times omethoate.

(3) scale insects, which are often harmful to the back of the leaves. The method of control is the same as that of other flowers.

The above is the summary of the growth habits and cultivation management techniques of white orchids by the editor of Huinong Network. I hope it will be helpful to the growers!