Autumn cabbage maggots are very serious, how to prevent and control autumn cabbage maggots?

Put some insecticides before planting, you can also put some trichlorfon powder, you can also put some grass ash and lime powder, you can also use trapping to clean up larvae and eggs, and strengthen field management.

First of all, it is necessary to spray pesticides in time, and to remove weeds, and must be sterilized and disinfected in time, and to increase the fertility of the soil, it must be watered in time.

You can sprinkle some pesticides in the ground, you can also sprinkle some insect repellent drugs, and you can also fight insecticides, so that you can improve the maggots in the vegetable field.

If there is this kind of bug, it is best to use dichlorvos, which can be controlled to a certain extent, and all the bugs can be removed.

1. Booby-trap. With kilograms of sugar, 1 kilogram of vinegar, kilograms of water, and then add 20 grams of trichlorfon powder, to make a mixture, in early August, dig a bowl-sized pit every 8-10 meters away in the field, put it into a plastic bag according to the size of the pit, pour 100 grams of mixture, and add the mixture every 10 days or so, so that a large number of adults can be trapped.

2. Spray 800-1000 times of 90% crystal trichlorfon, or 2000 times of phosphine, or 1000 times of 80% dichlorvos emulsifiable concentrate, every 7 days, and spray 2-3 times in a row to achieve control effects.

2. Larval control: about 10 days after the peak adult period, it is the peak period of oviposition, or when the egg plant rate in the field reaches 10%, it is the appropriate period for larval control.

1. When sowing, sprinkle 4-5 grains of coarse salt with the seeds in each hole to prevent maggots.

2. Use 15-20 kg of fine sand or fine furnace ash through a sieve, mix kg of trichlorfon powder, mix well and sprinkle it around the cabbage root, which can prevent maggots from eating the cabbage root.

3. Use 300 ml of chlorpyrifos per mu to 50 kg of water or 2000 times of phoxanthion solution, and fill about 200 grams of medicine solution per plant, so that the liquid medicine flows from the cabbage heart to the rhizosphere to ensure that the root soil is moist, and the roots are generally irrigated 1-2 times, which can kill maggots.

Pesticides. Because pesticides can kill maggots without harming autumn cabbage, pesticides should be applied.

In order to prevent and control maggots in autumn cabbage fields, treat the soil with phosphine granules before planting, kill flies, eggs and larvae, trap and kill adults with sweet and sour solution, and use crystal trichlorfon or dimethoate EC to irrigate the roots 1-2 times to achieve the control effect.

It should be controlled with pesticides, you can go to the pharmacy to buy some pesticides, spray them on the cabbage, and these insects will be killed.

It is recommended that vegetable farmers mix the purchased manure with broken grass, soil miscellaneous fertilizer, manure, human manure and superphosphate, sprinkle water to mix the humidity evenly, hold it into a ball by hand, and spread it out when it falls to a height of 1 meter from the ground, and then pile it into a yurt shape with a height of 80-100 cm, and the seeds are treated. Dilute with 3911 emulsifiable concentrate with seed amount, plus 8 10% water for seed amount, evenly spray on the seeds, stir while spraying, suffocate for 6 12 hours after spraying, and sow after drying. or treated with the same dose of 50% 1605 emulsifiable concentrate.

50% dichlorcines-maggots-white turtles: Efficacy: An ultra-efficient insecticide integrating the five functions of strong contact killing, stomach poisoning, fumigation, evasion, and systemic conduction, with miraculous effects such as low dosage and fast killing speed.

Pesticide control: in the adult stage, spray once every seven days or so, with 2.5 percent trichlorfon powder, three to five catties per mu, or 90 percent of trichlorfon 1,500 times; It is also possible to use 90% trichlorfon three to four catties per mu when watering.

In the adult occurrence period, spray once every seven days or so, with 2.5 percent trichlorfon powder, three to five catties per mu including 90 percent trichlorfon, 1,500 times liquid can also be watered with 90 percent trichlorfon per mu three to four catties, with water garlic, green onions are good to prevent, before sowing, in the soil, apply chlorpyrifos, or phosphine granules, etc., about 5 kilograms per mu, fully mixed with the soil, can ensure that a crop does not grow maggots for a lifetime.

Autumn cabbage maggot is the larvae of the radish fly, the radish fly will occur in many areas of our country, and one generation occurs every year, overwintering in the soil in the form of a pupa with a dormancy period of about 10 months. In the second year of adult occurrence, radish fly diseases mainly start in early August, insect growth regulators: lice mite urea, fluorbol urea, fluridine urea, mosquito fly ether, fly amine, chloride neonicotinoids

Imidacloprid, clothianidin, thiamethoxam, dinotefuran.

Some pesticides can be sprayed, and some pesticides can drive away maggots.

The occurrence of ground maggots can also be prevented by applying ammonia. About 30 days after the Chinese cabbage is planted, mix well with 1 kg of ammonia and 100 kg of water, and then water the roots, about 150-200 grams per foot. Or combined with autumn cabbage irrigation, slowly pour ammonia water into the running water for furrow irrigation, which can not only prevent the occurrence of maggots on the ground, but also play the role of top dressing.

Do a good job of temperature control, control the temperature in the greenhouse lower, reduce the addition of water, you can prevent the emergence of this organism.

This is difficult to prevent, but if this does happen, you can deal with it by applying pesticides.

If you are not at ease, you can actually apply some pesticides in the early stage of cabbage planting in advance, so that the effect will be much better.

If the Chinese cabbage is about to be harvested, then the root of the Chinese cabbage has maggots, and some drugs like Baitolin should be sprayed to make the maggots of the Chinese cabbage die, so that it is beneficial to the Chinese cabbage food.

The cabbage is about to be harvested, and the cabbage root has maggots, and there is no way to apply pesticides.

Chinese cabbage can only be harvested in advance.

Cabbage propagation and cultivation techniques.

Fertilization and land preparation: 2000 to 3000 kg of decomposed organic fertilizer per mu, and 60 kg of potassium sulfate compound fertilizer as base fertilizer. Deep ploughing 30 to 40 cm, leveling and raking fine after ridge spacing, ridge spacing 60 cm, ridge standard for the bottom width of 35 to 40 cm, neck width of 20 to 25 cm, ridge height of 20 cm.

When mechanical ridge formation, the ridger is required to be equipped with a roller to compact the soil ridge, which is conducive to sowing.

Watering to create moisture: When the soil moisture is insufficient, it is necessary to water and create moisture before preparing the land after applying basal fertilizer.

Fine sowing: The main sowing method of Chinese cabbage in autumn is live broadcasting, which is divided into two methods: strip sowing and hole sowing.

Strip sowing: In the shallow ditch where the ridge is opened to a depth of centimeters, the seeds are evenly sprinkled in the ditch and then covered with soil and compacted, with a seed amount of about 120 grams per mu. You can also use a cabbage seeder to sow seeds in the middle of the top of the ridge, with a seed amount of 80 to 100 grams per mu, and the seeder should be equipped with soil covering and suppression facilities.

Hole sowing: at the top of the ridge according to about 55 cm hole spacing, and the soil ridge perpendicular to the length of 10 to 15 cm, deep to centimeter of the ditch, each ditch sowing 5 to 6 seeds, after sowing cover fine soil centimeter compaction, per mu with 100 to 120 grams of seeds.

Cultivation techniques. Seedlings: 5 to 6 days after the emergence of seedlings, the first seedlings, to the weak and strong, strip sowing seedlings spacing 2 to 3 cm; When the Chinese cabbage has 3 to 4 leaves, the seedlings of the strip sowing plot are 8 cm, and about 3 plants are left in each hole when the hole is sown; After another 5 to 6 days, the third seedling is sent.

Seedling: Seedlings grow for about 25 days to reach the cluster stage, according to the plant spacing of 50 to 60 cm seedlings, leaving about 2,000 seedlings per mu. If the lack of seedlings is found, it should be replanted in time, and the seedlings should be watered in the afternoon or cloudy day on a sunny day.

Cultivating and weeding: 3 times of tillage, respectively after the second seedling, after seedling setting and in the middle of the rosette. Cultivating combined with weeding.

Reasonable watering: If the bottom moisture is insufficient, water in time after sowing to ensure that the seedlings are strong and strong. After thinning seedlings and setting seedlings, water 1 water each. Watering at the beginning of the rosette promotes the growth of the trees. During the balling period, watering should be carried out in combination with top dressing, and the amount of watering should be large and uniform. In the later stage, appropriate water control promotes the core wrapping.

Timely top dressing: 15 to 20 acres of nitrogen, phosphorus and potassium compound fertilizer per mu at the rosette stage. At the beginning of balling, 30 to 40 kg of nitrogen, phosphorus and potassium compound fertilizer were applied per mu.

No more topdressing within 20 days before harvest. Combined spraying at the rosette stage begins with 1 spray of foliar fertilizer every 7 to 10 days, a total of 2 to 3 times, using a mixture of urea and potassium dihydrogen phosphate, sprayed after 16 o'clock.

Harvest: After mid-November, Chinese cabbage basically stops growing and enters the harvest period. After the beginning of December, it should be harvested in time to prevent frost damage.

There are many drugs that can be used to control maggots, but in recent years, chloronicotinoid insecticides have performed relatively well, and you can try two or three different types of insecticides. Prevention and control agents:

1. Insect growth regulators: lice mite urea, flubol urea, fluridine urea, mosquito and fly ether, fly amine, larval urea.

2. Neonicotinoids: imidacloprid, clothianidin, thiamethoxam, dinotefuran, 3. Organophosphorus: chlorpyrifos, phoxanthion.

4. Plant pesticides: nicotine, matrine, azadirachtin.

5. Pyrethroids: Kung Fu.

6. Carbamates: carbofuran, carbosulfan.

7. Others: pyroxonil.

Keep the room ventilated and dry, and use fumigants to kill insects.

Maggots are invertebrate insects, larvae of the order Diptera, and are called headless larvae due to the extreme degeneration of the head and mouthparts. The larvae of such a fly, the maggot, are the headless larvae collapsed.

Root maggots are one of the main pests that harm Chinese cabbage. Root maggot is the larvae of the seed fly, the appearance of the seed fly is similar to the ordinary house fly, Wang Hao its mao is born on the back of the base of the Chinese cabbage, after 2 to 3 days after hatching into a small maggot, that is, the root maggot. The root maggots then burrow into the stone and bite the epidermis of the Chinese cabbage roots, causing the pathogens in the soil to take advantage of the weakness and cause the Chinese cabbage to rot.

If it is not prevented and controlled in time, the whole field of Chinese cabbage can be harmed, and no one is spared.

Citrus fruit flies occur in one generation in one year, and the pupae overwinter in the soil. Adults appear in late April, early May is the peak period, enter the orchard from June to mid-July to lay eggs, mid-June is the peak period, and hatch into larvae from July to September, which is harmful to fruit decay. The affected fruit falls off in late September, and the larvae follow the fruit to the ground, and then the fruit falls into the soil and pupates.

Adults are mostly unearthed at noon on sunny days. Adults lay eggs on the umbilicus of the fruit, where there is a small puncture, and the peel turns from green to yellow. Orange orchards that are cloudy and moist and orange orchards with a lot of nectar sources are seriously affected by it.

Citrus fruit fly is mainly spread by water flow and the transport or carrying of insects and fruits, and can also be spread by the migration of adults and a small number of insect pupae with soil seedlings, and the adults have strong flying power, and the flight distance can reach about 400m, and can spread by themselves.