How to prevent and cure plant powdery mildew? What are the specific drugs?

Powdery mildew is mainly harmful to the leaves of crops, but also to stems and spikes. it can occur from young seedlings to heading, and yellow dots begin to appear on the leaves, and then expand and develop into round or oval disease spots, with a layer of white powdery mildew on the surface, caused by wheat powdery mildew, mainly harmful to wheat, barley, rye, oats and so on. Let's take a look at the specific drugs for powdery mildew.

Specific drug for cucumber powdery mildew

During the onset of the disease, 50 grams per mu of controlled white wettable powder, or 5% chlorothalonil dust or sublimated sulfur powder can be used to control white water milk. In particular, it should be mentioned that the spray control effect of 0.1-0.2% baking soda solution is good. Baking soda is a weakly alkaline substance, which can inhibit the growth and spread of many kinds of fungi. After spraying, it can decompose effluent and carbon dioxide, and has the effect of promoting photosynthesis, and it is cheap, safe and pollution-free.

Specific medicine for powdery mildew of rose

Spray 5 sulfur mixture before germination, spray 1500 times of 25% trimethoprim wettable powder at the initial stage of the disease, or 1000 times of 70% methyl topiramate wettable powder, or 1000 times of 15% thiophanate wettable powder, or 0.02% 0.03% potassium permanganate solution.

Specific drug for melon powdery mildew

1. 15 kg of water is added to upgrade accurate compound (white control) every 20 to 30 milliliters. Spray once every 7 days, spray 2 or 3 times. The drug is used in plots where powdery mildew occurs alone or where downy mildew occurs slightly at the same time. Pay attention to the dispensing should not be mixed with any other pesticides and fertilizers, dispensing should use clear water, canal water should be precipitated before dispensing.

2. 80% sulfur 400 times plus 72% benzothiourea cyanide 600 times spray, 150 grams of sulfur plus 100 grams of benzothiourea cyanide plus 60 kilograms of water, triazole fungicides such as nitrile, flurobutrazole, etc.

Specific drug for grape powdery mildew

1. Spray Bordeaux solution once every 15 days before sprouting grape buds without sprouting. Spray Baume 3% stone sulfur mixture or 45% crystal stone sulfur mixture 40 times 50 times before sprouting, spray Bordeaux solution every 15 days for 3 times continuously.

2. Spray control in the early stage of the disease, 300m CFU/ of Trichoderma wettable powder, 1500 times of flusilazole, 1000 times of methylthiophanate, 800x of ethoxylate, 600x of 40% polysulfide suspension, 20000x of 50% sulfur suspension, 8000x of ether ester, 2000 times of triadimefon and thiazolidone sulfur suspension. 56% azoxystrobin 600 times of chlorothalonil.

Specific drug for wheat powdery mildew

1. Spray control at the early stage of the disease in spring. Choose 15% triadimefon wettable powder 80g 100g or 12.5% uniconazole wettable powder 20g / mu, add 80g 100g potassium dihydrogen phosphate or 50g chitosan, spray 30kg 45kg of water evenly after mixing, generally spray twice, it can achieve the purpose of drought and disease resistance, dry hot wind and improve plant stress resistance.

2. Spraying 200 μ g / ml paclobutrazol solution of 30 kg / mu during the starting period of wheat could dwarf the plant, enhance its lodging resistance, treat wheat powdery mildew and improve the absorption and utilization of nitrogen.

3. When the diseased plant rate of wheat at booting and heading stage reaches 1530% or the diseased leaf rate reaches 815%, 15% strychnine wettable powder 50 g or 20% strychnine EC 40 g per mu, 10 kg of water can be sprayed, and the disease can be controlled after one control.

Control of garden plant diseases and insect pests in April

Leaf-eating pests in January and April:

The main results are as follows: (1) the yellow poplar silk wild borer entered the peak period in late April, when the leaves were eaten up and the whole plant was withered and yellow. 2500 diflubenzuron can be used in the early stage, and 1000 times omethoate EC can be used to control the aged larvae.

(2) Beetles: adults can be killed by shaking them down from the tree, or trapped by black light.

(3) American white moth: in the middle of April, the overwintering generation of American white moth adults emerged, which can be caught and controlled manually.

(4) Spodoptera litura: in late April, the first generation of larvae of Robinia pseudoacacia began to damage, so we should seize the best time to spray carbamide and so on.

Stem borer in February and April:

In April, stem borers began to harm activities, mainly rust-colored longicorn beetles, bare-shouldered longicorn beetles, stink trench orbital elephants, etc., in addition to artificial injection, the habits of different pests should be controlled.

Prick-sucking pests in March and April:

1. Aphids. The aphids that should be prevented and controlled are: peach aphid, rose aphid, willow black hair aphid, polymorphic aphid, cotton aphid and so on. The preferred agent for aphid control is 1.2% nicotine emulsion 800-1000 times, and others can choose 40% omethoate EC 1000 times. Imidacloprid 2000 times and so on. Pay attention to peach trees and other Rosaceae plants with caution in the use of organophosphorus pesticides to prevent drug damage.

2. Scale. Grass scale, peach scale and other activities began to harm, the main control methods are smearing poison ring, you can also choose some special scale control drugs.

3. Spotted wax cicada. It began to hatch in the last ten days, and groups of small nymphs concentrated on the twigs, so we should seize the favorable opportunity to control them, such as 1000 pyrethroids and so on.

4. Red spider. From late April to early May, the first generation of nymph is harmful, silk is drawn, a layer of ash is stuck on the cypress leaves, and the needles turn gray and yellow, which seriously affects the ornamental effect. When testing, you can shake the twigs in the palm of your hand and find that there are small black spots crawling, indicating the occurrence of mites, timely spray prevention and control. The choice of medicament is 15%, 1500 times, 2000 times, and 1000 times, respectively.

Underground pests in April:

Attention should be paid to the control of grubs, which can be sprayed with 1000 phoxim EC.

Diseases in May and April:

This month, some diseases are in the initial infection stage, such as big leaf yellow poplar powdery mildew, rose black spot and so on. The key control object in this period is the rot disease of various tree species, and the main control method is to strengthen fertilizer and water management and apply chemical control.

Symptoms and control methods of 9 major diseases and insect pests in succulent plants

Illustrating the symptoms and control methods of 9 major diseases and insect pests in succulent plants

Autumn, it is a good time to raise meat, but meat often occurs some diseases and insect pests, many flower friends do not know how to deal with, today Huahua takes you to see the picture diagnosis and treatment, 9 most meat pest control methods all teach you!

The first scale insect

Small scale insects are often seen parasitic on the leaves. They are usually white and do not move much. It is difficult to find them hidden in the center of the leaves. How to get rid of them and prevent them from multiplying in large numbers?

The white bug pictured above is a scale insect.

Shell insects are protected by hard shells, and it is not easy to kill them after the disease. Scale insects are most common in succulent plants of the family Cactus, Euphorbiaceae, Liliaceae, Amygdalaceae and jade.

Scale insects reproduce rapidly, each adult lays nearly 100 eggs twice a year, and the eggs are powdery. After drying and cracking, they float away with the wind and are scattered on the stems and leaves of plants everywhere. When the water is wet at high temperature, the adults hatch. At this time, the shell has not yet been formed, is the best time to destroy.

There are also many species of scale insects, which are covered with a waxy hard shell and are round or oval in shape. the former is about 3 to 3.5 mm in diameter, and the latter is about 2 mm in length and 1 mm in width. when the quantity is small, it is parasitic near the thorn seat or in the leaf back and leaf sheath of the plant. When the quantity is large, the stems, branches and leaves are parasitic everywhere, absorbing plant nutrients.

Treatment: when the number is small, you should immediately remove it with bamboo sticks and toothbrushes, isolate flowerpots with worms, so as to avoid infection, and use brush to wash with Bizhi diluent or high concentration of alcohol to kill larvae and eggs.

Note: the most suitable pharmaceutical recommendation

1. Protect the god of flowers

It can be eradicated with 500 times dilution, spraying stems and leaves once a week and 2-3 times. General toxicity, but can not be sprayed in the wind, do a good job of ventilation, and should wear masks, gloves, after the work, be sure to take a bath and change clothes.

2. The ratio of liquor to water is 1:2.

When controlling insects, water through the surface of the basin soil. Scale insects begin to move when the room temperature is 7 ℃ in spring. It can be watered once in April, and then every half a month or so, and it has been effective for 4 times in a row.

3. Vinegar (rice vinegar)

50ml, soak the small cotton balls in vinegar and gently wipe the damaged stems and leaves with wet cotton balls to wipe off the shell insects. This method is convenient and safe, which can not only achieve the purpose of disinfestation, but also make the damaged leaves green and shiny again.

4. Alcohol

Gently wipe the diseased plant repeatedly, you can get rid of the scale insects, and can be very clean and thorough. For example, when wiping the diseased leaves of orchids with alcohol, not only the scale insects can be removed, but also the larvae that are not visible to the naked eye can be completely killed, and the harm of scale insects is rarely found in the second year. This method is simple, safe and effective.

5. Diesel oil, washing powder and water

At this time, the mother liquor contains 60%, which is in the shape of milk. After diluting the oily 30% solution with water, the beetle insects on Milan, kumquat and cycad are carefully sprayed. After a week, most of the scale insects changed from fresh orange to withered state, indicating that this method has a good control effect on scale insects.

Second place anthrax

There are small black spots on the leaves. What disease is it caused by?

The black spot above is anthrax.

Cause of illness:

It usually occurs in over-planted, poorly ventilated or injured wounds. The main damage occurred in the stem, stem node or near the edge of the small brown spots, and then expanded into round to oval or semicircular to amorphous brown spots.

Treatment:

Brown depressions and spots are produced in the early stage of the disease, and when serious, there is gangrene in the center of the spot, which is difficult to cure. When buying, you should pay attention to whether the plant has this epidemic disease and avoid buying. When you get sick, be sure to cut off and burn the disease, and then use special agents such as anthrax and Fumei.

The third place is rust

A flower friend asked: there are rusty spots like rust on the leaves. What is the disease?

The picture above shows rust.

Cause of illness:

It is mainly caused by improper cultivation management, such as poor pot soil, lack of nutrients, or poor ventilation for a long time, direct watering at the top of the plant, and rust infection caused by environmental factors.

The disease occurs in the plant epidermis. At the initial stage, swollen dots appear in the stem epidermis, showing yellow or reddish brown in the center, and then slowly expand around, seriously sagging to form ulcers, blackening tissue and even death.

Treatment:

In addition to paying attention to management, to strengthen ventilation and avoid watering at the top of the plant, 12.5% uniconazole wettable powder 2000-3000 times or ammonium Naipu 1500002000 times diluent can be sprayed once a week.

The fourth root powder scale insect

The plant root appears white cotton wool, filamentous disease, what disease is it after all, how should solve?

The above picture shows the root powder scale insect.

When the plant is dormant, the basin soil is dry, and the root powder beetle has strong fecundity, and it will climb out from the bottom of the basin and invade the other pot. if the plant is seriously injured, the soil near the flower root is white and cannot be watered.

Pest judgment:

This pest is mostly parasitic on the root of the plant, the body length is about a few millimeters, there is white powder on the outside, and the parasitic place is a lump.

Treatment:

Infuse the flower protection god with water into the culture soil, or "Guoguang must be treated", the two flower protection gods are less harmful and have a preventive effect; if they have been parasitized, they can wash the plants, remove the parasitic parts of the root lice, and plant new soil.

You can also use prednisone, which can remove most pests. They can only be used occasionally on plants that are not edible. Plants used for eating cannot be used. Be sure to carefully look at the mode of use and dilution multiple.

The fifth red spider

There are red spiders in the potted plants at home, which will spread to the nearby plants if you don't pay attention to them. How to prevent and cure them?

The picture above shows the red spider.

Red spiders reproduce rapidly during the drying period, and foliar spray can restrain the damage. Among the harmful flowers, cactus, apricot, Euphorbiaceae and Liliaceae are more common.

Red spider about 0.5 mm in diameter, fast crawling, small size, not easy to find, often gathered in groups, gnawing on stem and leaf epidermis, so that the injured place is mottled rough, indecent white or yellow.

Treatment:

Red spiders are easy to develop drug resistance, long-term use of a drug, will reduce the effectiveness. At present, the drugs used are imidacloprid, nicotine, carbofuran, pyrethroid insecticides are not very effective on it, the radar and other pesticides on the market have no effect, the above drugs are relatively easy to buy, but carbofuran is extremely toxic and cautious.

Florists can also smoke with mosquito-repellent incense for 30 to 60 minutes at a time.

PS: the method of self-made pepper water is simple, as long as crushing raw pepper and garlic, and then mixing with water, but the effect is not as effective as insecticides, so it is suitable for prevention and use in advance.

The sixth aphid

Flower friend asked: dense aphids swarm on plants, how to eliminate them?

The picture above shows aphids.

Species that are prone to insect pests include Sedum, Compositae and Cactus, which are all common.

Diseases and insect pests:

Aphids can reproduce 5-10 larvae a day, which are usually gray-green pests, about 1-2 mm long. community plants pierce the plant tissue to absorb nutrients near the branches or on the new buds, and the young leaves are often curled into cylinders. In that way, flower friends can not see the aphids, which is very tricky.

Treatment:

Mix a bottle of Huasheng pesticide with a 500ml cola bottle, fill it into a spray can, and then spray it evenly on the plants. Spray must be comprehensive and meticulous; remove the surrounding weeds to ensure a clean environment, but also have a preventive effect.

Sixth snail and slug

The leaf was obviously bitten around. What kind of pest caused it? What should we do about it?

Causes of insect pests:

If the climate is warm and humid, snails and slugs will become more and more, and they will reproduce quickly. These soft bugs can be found in both urban and rural areas, and can be found when they grow more plants.

Generally speaking, these soft bugs are generally snails and slugs, and many flower lovers say that they cannot be found because they hide in damp and dark places during the day and come out to look for food at night, not only eating young branches and young leaves, but also old stems and leaves.

Treatment:

Remove weeds, rubbish, tiles and other deposits around the pot, keep clean can effectively prevent, in addition, install screen isolation around the pot, or buy special medicine to kill snails, you can also sprinkle lime or salt next to the flowerpot, do not sprinkle the soil.

The seventh ant

Flower friend asked: ants will not directly bite plants, will it endanger plant health?

Of course, they are very harmful. They are the biggest accomplices in the destruction of succulent plants.

The picture above shows ants.

Cause of damage:

Because ants like to eat the secretions of aphids, woolly worms and shell insects, they often move these pests from diseased succulent insects to other succulent insects, which is really very abominable. These ants not only protect the survival of pests, but also eat the nectar secreted by pests. They collude with each other and are the biggest accomplices to harm plants.

Prevention and control measures:

When buying potted plants, carefully check the surroundings and the bottom of the pot to see if there are any ants, because once there are ants, it means that there may be other pests; when ant damage occurs, you can use general pesticides.

The eighth big caterpillar

Flower friend asked: what should I do if I see a fat caterpillar in a potted plant at home?

The picture above shows the caterpillar.

Diseases and insect pests:

Some succulent plants close to shrubs and trees are easy to have this kind of caterpillar, some are blown down on flower plants by the wind, some climb to succulent plants at night from the shadows, and the most abominable is a kind of black burglar in the latent soil, which specializes in eating young stems and leaves of plants, and takes succulent plants as the main prey.

Treatment:

Remove weeds around the potted plant and set up gauze. In general, the oily insecticidal liquid on the market is very effective against caterpillars, but you must be careful with plants, otherwise plants are vulnerable to drugs, just grab one or two and kill them.

No. 9 Xiao Hefei

Xiao Hei Fei is a kind of thing similar to mosquito larvae, but it doesn't live in water, but it can fly, it can be found in warm and humid environment, and it breeds very fast, it's really annoying!

The picture above shows Xiao Hefei.

Diseases and insect pests:

In fact, harmful plants mainly leave scars after feeding, and they multiply very fast, which looks very bad.

Treatment:

It can be killed mainly with pyrethroid insecticides. Huasheng can be used to irrigate and spray plants in the soil, or carbofuran can be buried in the soil. Pay attention to the small amount of medicine, only one medicine is easy to make insects develop disease resistance; it can also be fumigated with a small section of mosquito incense, which is effective on adults and cannot kill the larvae in the hidden soil!