There are a lot of cotton like white spots on the branches and leaves of the orchid, which don t loo

This is a flower pest called whitefly.

Whitefly is one of the common pests in the greenhouse, it is small in size, not easy to find, and the incidence is high, the damage is wide, if not timely control, it will damage a variety of flowers, the light one grows poorly, and the heavy one destroys the whole plant.

1. Characteristics and habits of whiteflies.

The larvae and eggs of whiteflies are fixed on the back of plant leaves, sucking plant sap, especially young leaves, causing the leaves to fade, turn yellow, wither, and dry up. The excrement of whiteflies can cause coal stain disease, which affects flowering and ornamental effects. The whitefly has the characteristics of migration and is also a vector for the transmission of plant viruses.

It is harmful to flowers and shrubs such as redberry, melon leaf chrysanthemum, five-color plum, rhododendron, hibiscus, hydrangea, pansy and succulents.

The adult whitefly is yellowish-white, with transparent wings and a white waxy powdery covering on the body surface, hence the name whitefly. Small in size, easy to leap, not easy to catch. The eggs and larvae are basically oval, about millimeter in size, pale yellow and transparent, with white wax filaments on the outside.

The eggs hatch into larvae after one week.

Whitefly likes a warm, unventilated environment, occurs more than 10 generations a year, reproduces quickly, lays a large number of eggs, overlaps the generations seriously, and overwinters on greenhouse plants in various insect states. Adults like to live in groups, lay eggs on the back of the upper young leaves, and feed on them. When adults inhabit the foliage, they are often distributed in pairs.

The plant grows, and the adults continue to shift to the upper young leaves. In general, the top part of the plant is the adult and the newly laid eggs, followed by the brown-black eggs that are about to hatch, and then the first instar larvae and below.

The second and third instar larvae, the lowest part is the "false pupa", and the pupal shell that has emerged. In general, each female can lay 100 200 eggs, and the eggs hatch into larvae after 6 to 8 days. The larvae enter the pupal stage in 8 to 10 days, and the pupal stage is about 7 days to emerge as adults.

Second, prevention and control methods.

1.Horticultural control Remove weeds around greenhouses and greenhouses to mitigate insect sources.

2.Pharmaceutical prevention and control with 80 dichlorvos 1:2 plus water atomization fumigation, according to 1 ml of stock solution per cubic meter, every 5 7 days 1 time, each fumigation must close the doors and windows.

It can also be sprayed with 2000 times of deltamethrin solution, or 20 times of 2000 times of dibutyl, 2 kg per 667 square meters, sprayed once every 6 days, 2 3 times in a row, all have good results.

3.Physical control The use of whitefly has a strong tropism to yellow, can be hung or inserted indoors yellow plastic board, and the board is coated with sticky oil, so that the flying adults stick to the board by themselves, play a good trapping effect.

What others think is not particularly important, you think you are doing the right thing, but you can't hurt yourself and others.

This is a "scale worm".

Can be removed by hand, with a toothpick or toothbrush.

Pesticide with 40% dimethoate 1000 times solution, or.

50% malathion 1500 times solution, or 255 imithion 1000 times solution, or 50% dichlorvos 1000 times solution, or deltamethrin 3000 times solution, spray.

Other prevention and control methods.

Mix liquor with water in a ratio of 1:2. When treating insects, water the surface layer of the potting soil thoroughly. Scale insects begin to move at room temperature 7 in spring. It can be poured once in April, and then every half a month or so, and it is effective for 4 consecutive times.

Use 50 ml of vinegar (rice vinegar), soak a small cotton ball in vinegar, and gently rub it on the stems and leaves of the affected flowers and trees with a wet cotton ball to wipe off and kill the scale insects. This method is convenient and safe, which can not only achieve the purpose of insect control, but also make the damaged leaves green and shiny again.

Gently and repeatedly rubbing the diseased plant with alcohol can remove the scale insects, and it can be removed very cleanly and thoroughly. If you wipe the orchid leaves with alcohol, not only can you get rid of the scale insects, but also the larvae that are not clear to the naked eye, and they are completely killed.

Use diesel, washing powder, water according to the ratio of :6 to adjust the mother liquor, at this time the mother liquor contains 60%, milk-like, diluted with water 30% of the oil solution, the Milan, kumquat, cycad on the scale insects carefully sprayed. After one week, most of the scale insects changed from fresh orange to shriveled state, indicating that this method has a good control effect on scale insects.

It's a pest! You can spray imidacloprid with water once and you're good to go! (The concentration should be large, imidacloprid is harmless to orchids, only a slight pesticide taste).

It seems to be a scale scale insect, go to a flower shop or pesticide store to buy dimethoate or environmentally friendly better scale insect killing drugs, spray and kill insects according to the amount used or the method taught by the boss, this drug is toxic and pay attention to safety.

Hello, your ** pixel is not high, you can't see it very clearly, it may be a scale insect, you use systemic insecticides, imidacloprid 800-1000 times, or pyridoxin 2000 times to spray the foliage.

Powdery mildew, symptoms: powdery mildew is a fungal disease, is a common disease on flower plants, mainly occurs in plant leaves, serious can infect the young leaves, young shoots, shoots and flower buds of the plant, the main damaged flower varieties are Yueji, rose, rose, peony, peony, chrysanthemum and so on dozens of species. The prominent feature is that a layer of powder appears on the back or both sides of the leaf at the time of onset, and in the early stage of the disease, a nearly round or irregularly shaped white pink spot appears on the infected site, and it is slightly greenish or deformed.

Under the right conditions, the pink spots expand rapidly and join together to form patches, so that the leaves are covered with white powdery mold. In the later stages of the disease, the diseased leaves will be shrunken and curled back, and the flowering period will be significantly shortened or the flower buds will not be normal. In severe cases, the plants are short, the flowers are few and small, the leaves are shriveled and dry, and even the whole plant dies.

Don't delay orchids infected with powdery mildew, 2 common items can be easily solved.

The appearance of white spots on orchid leaves is leukoplakia.

Symptoms: Vitiligo mainly affects leaves. The leaves are initially grayish-brown with small near-round spots, and the later diameter expands to 6 18 mm light gray to white irregular lesions, with dark green halos on the periphery, or the edges of the lesions are moist. When wet, there is dark gray mold on the surface of the lesions, the lesion tissues become thin and slightly transparent, some are ruptured or perforated, and in severe cases, the lesions are connected into plaques, causing the leaves to dry up.

Prevention and control methods: 1. You can go to the plant hospital or the place where you buy pesticides to buy a small bag of one of "chlorothalonil", "carbendazim" or "tobuzin", and use it according to the instructions.

2. When a small amount occurs, you can use a soft toothbrush or a small brown brush to gently brush off the leaves, or you can use thin bamboo slices to scrape off the insect body.

3. The breeding environment and orchid basin should be ventilated and transparent, and the potting soil should not be too wet.

4. You can use 80% dichlorvos emulsion and add 1000-1500 times water to make a solution and spray it twice, once a week.

5. Apply 5% carbofuran 5 to 8 grams around the potting soil, irrigate 1 time, and kill it after 7 days.

6. When the disease is found, isolate the disease strain to prevent infection.

It is a scale insect and has two varieties. If the number of pots is not large, just brush it down with a brush, and if there are many pots, you need to apply medicine. Spray it with chlorpyrifos two or three times and it's gone.

Orchid leaves have "small white spots", which are mainly caused by 2 reasons, and must be controlled.

It is an aphid, and the control method:

1. Urea root fertilization method, when aphids, red spiders, thrips and other insect pests occur in flowers, spray with 20% urea solution every 10 days or so, 2 3 times in a row, not only can kill the appeal pests, but also make the leaves of the plant bright green and shiny.

2. Tobacco infusion method, soak 40 grams of tobacco powder in 1 kg of water, soak for 24 hours and then filter, spray the damaged plants 2 3 times, with an interval of 5 days, which can control red spiders and aphids.

It should be a blowing scale, like cotton, white. Erase with a cotton swab and spray with insecticide. Pay attention to the usual observation, and once found, erase it immediately.

Sprinkle it in a pot with phoenix oil essence or use dimethoate directly.