What to do if there are small white worms in the mosaic leaves, and what medicine can be used to tre

1. Powdery mildew.

At the time of the disease, a layer of white powder appears on the leaves, branches and shoots of the tree, which affects photosynthesis, causing the leaves to be uneven, shriveled and dry, and the new shoots are deformed, and in severe cases, the plant dies. Crape myrtle and triangular maple are more common.

Powdery mildew overwinters on diseased buds, diseased branches or fallen leaves of the parasite with hyphae. When the temperature is right in spring, it grows and develops, producing conidia for dispersal and infection. 6 In August, a large number of conidia were produced in high temperatures, which expanded and re-infected.

The conidia fall on the leaves, germinate and grow hyphae, grow on the surface of the leaves, and grow sucking cells from the leaf stomata into the tissues to absorb the nutrients of the leaves.

After understanding the occurrence rules and infection process of powdery mildew, the following methods can be adopted to prevent and control them:

1) Place the bonsai in a ventilated and light-filled environment. Reduce the density of bonsai placement, and properly thin branches and leaves;

2) Artificially reduce the ambient temperature and humidity;

3) Prune the diseased branches and leaves, and burn the diseased branches and leaves in a concentrated manner;

Spray scale insect pesticides on mosaic leaves, spray once every 7 to 10 days, 2 to 3 times in a row, that is, **. Repeated smearing of diseased plants with alcohol can remove scale insects, and they can be removed very cleanly. Rubbing the flowers and leaves with 50 ml of vinegar or rice vinegar and soaking cotton balls can also be controlled.

Mixing liquor with water, the ratio is 1:2, watering the soil, can also be effective.

Generally, the small white insects on the mosaic leaves are scale insects, and they are sprayed with scale insect pesticides, such as phosphorus, etc., every 7 to 10 days, 2 to 3 times in a row. Spray in the peak stage of nymphs, because the nymphs have just hatched, the body surface has not yet secreted wax, the shell has not formed, and it is easy to kill with medicine.

Repeated smearing of diseased plants with alcohol can remove scale insects, and they can be removed very cleanly. When the alcohol wipes the flowers and leaves, it can not only remove the scale insects, but also the larvae that are not clear can be completely eliminated, and there will be few scale insects in the second year.

Use 50 ml of vinegar or rice vinegar, soak the cotton ball in vinegar, and gently wipe it on the damaged flowers and leaves with a wet cotton ball, and then wipe off the scale insects. This method is convenient and safe, which can not only achieve the purpose of insect removal, but also make the damaged leaves green and shiny again.

You can also mix liquor with water in a ratio of 1:2. The top layer of the soil is watered thoroughly during insect control. Scale insects start to be active when the room temperature is 7 degrees in spring, and they can choose to water once in mid-April, and then water once every half a month or so, and water 4 times in a row to be effective, and less watering should be done during the period.

1.The white bugs that appear on the flowers should be whiteflies. As a pest and disease, whiteflies not only absorb water from plants, but also inject toxins into plants every year, resulting in reduced yields and a series of lesions.

The whitefly not only affects the appearance of the outside, but also harms the inside of the plant and aggravates the spread of various viruses. 2.How to deal with the harm of whiteflies in flowers and trees The first step is to prevent the first step of prevention, before the flowers and trees are not cultivated, the soil is exposed to the sun, the soil is disinfected and sterilized, and the eggs existing inside are killed.

The second step is to cover the sand with sand on the surface of the soil to reduce the number of whiteflies. Usually, pests such as whiteflies come from moist soil. The third step is spraying.

In the early stage of whitefly, use the solvent of imidacoxacarb, dilute it to about 500 times, or use the emulsifiable concentrate of prochlorphan, etc., once a week, spray two chapei three times in a row.

1.Before the plants are planted in pots, the soil should be treated and the soil should be dried in the sun for a few days to completely remove the eggs inside, which can also be conducive to high temperature disinfection and sterilization, and completely eliminate the eggs inside. However, it should be noted that when small white insects are found after planting, they can no longer be exposed to the sun to prevent burns to the flowers, and the plants can be taken out separately and then dried in the soil.

2.You can make some homemade potions to remove insects, you can take out the tobacco, and then soak it in water, about a day and a night, and then you can use it to irrigate the roots. You can also dilute the flower water and irrigate the roots, and apply it once a week at intervals, and the effect can be seen after about three or four times.

Or spray it with tea withered water, which can also have a preventive effect.

This is called white powder.

Lice because whiteflies will lay eggs on the leaves, so the effect of light to kill adults is not good, if there are fewer whiteflies, you can remove the leaves of the insects, completely cut off the whitefly. But this method has some harm to the plants.

Because whiteflies are more afraid of cold, so in the case of the plant is more cold-tolerant, you can put the plant in a cold environment, about half an hour, the insects will be frozen to death, and then use a rag to clean up the insect corpse. This method is only for hardy plants.

In many flower markets, there will be whitefly drugs to kill whiteflies, and after buying, spray according to the specified proportions. However, the drug** is not effective against the eggs of whitefly, so whitefly will be produced repeatedly, and multiple medications are required.

If there is no flower market nearby, you can spray directly at the plants with pesticides at home instead. After a while, you will find that the whiteflies are all dead, but the insecticides can also have a certain effect on the plant, which can cause damage to the leaves of the plant.

After spraying with the above insecticides or pesticides, if you are worried about the residue of insect eggs, you can use our adhesive tape to stick on the leaves of the plant, and the tape will stick the eggs attached to the leaves to eliminate worries.

Because the whitefly is small, you can put the plant in a ventilated environment, the wind blows for a while, the number of whiteflies will be greatly reduced, if there is no ventilation environment, you can directly use a hair dryer or fan to create an environment.

After spraying pesticides, after small white worms appear on the flowers and leaves, imidacloprid and avermectin can be diluted with water and sprayed on the leaves to kill; Wind oil essence, 2 3 drops of wind oil essence can be diluted with water, and evenly sprayed on the soil and flowers and leaves to kill small insects; Spraying soot water, you can soak the cigarette butt in water, take out the yellow solution, and spray it evenly on the flowers and leaves to kill the small white insects.

Small white worms appear on the mosaic leaves, which may be infected with whiteflies and need to be sprayed in time**. Imidacloprid and avermectin can be mixed and diluted, evenly sprayed on the infected leaves, sprayed 2 3 times in a row, can completely kill the small white insects on the flowers and leaves.

When small white worms appear on the flowers and leaves, if the situation is not particularly serious, it is recommended not to use pesticides to avoid polluting the air, you can dilute 2 3 drops of wind oil essence with water, and evenly spray it on the surface of the soil and branches and leaves, which can have a better insect control effect.

Nicotine, nicotine and other components in cigarettes have obvious insecticidal effects, after the appearance of small white worms on the flowers and leaves, you can collect cigarette butts to take out the tobacco, put them in a container and soak them in water, and after the solution becomes yellow-brown, they can be directly sprayed on the leaves of the disease for prevention and control.

Small white insects generally have a tendency to yellow, if the number of small white insects in the flower pot is large, you can buy a few sticky insect boards, placed around the flower pot, the small white insects will fly to the board after smelling the temperature, so as to kill the effect. And this method is more direct, and the effect is more obvious.