How to prevent insects from rapeseed grown by yourself, and can rapeseed be insecticide in winter

Vegetable aphid refers to the aphids that harm rapeseed, and there are three common types: radish aphid, cabbage aphid and peach red aphid. 3 different vegetable aphids, often mixed together for harm. When rape juice is sucked, the affected leaves are curled downward, the plants become yellow and short, and the growth is poor, which can lead to wilting and death in severe cases.

The first instar larvae feed on the back of the leaves, and the older larvae feed on the foliar surface, biting the leaf surface of rape into holes, and only the petiole and leaf veins are left in severe cases.

Brazen maggot refers to the larvae of the diamondback moth that harm rapeseed, and the larvae often bite through the epidermis from the back of the heart leaf and eat into the leaf tissue or stem, often causing a heartless plant.

The larvae are mostly concentrated on the dorsal and hearty leaves of the leaves, and the leaves are eaten into holes and nicks, and only the petioles and veins are left in severe cases.

Pest control methods: vegetable aphid with 40% dimethoate 800 1000 times liquid, or 50% aphid resistance 10 grams of water spray 50 kg; Cabbage worms, cabbage maggots, and black shell insects can be sprayed with 90% crystal trichlorfon or 80% dichlorvos emulsifiable concentrate 800 1000 times, or it can be mixed with injection drug dichloride, labor, and 20% inulin, a total of 20 ml of spray on 60 kg of water; The four kinds of pests are mostly harmed by the back of the leaf and the heart leaf, so pay attention to the back of the leaf and the heart leaf when spraying to enhance the effect.

You can sprinkle a little lime on the ground, or you can spray it with potassium and agricultural greenberry mixed with 8% liquid.

If you don't want to use pesticides, you can try biological insect control, such as Beauveria bassiana (fungus), Bacillus suruiensis (bacteria), red-eyed bees, etc.

You can spray some homemade cold pepper water.

It can be played. Rapeseed in the seedling stage, transplanting period, seedling stage and flowering stage all need an appropriate amount of pesticides, seedling stage: add an appropriate amount of carbendazim to the soil to prevent rapeseed root rot.

To prevent sclerotinia sclerotinia disease, methyl tobuzin or pythium can be used.

1. Rapeseed needs to be sprayed in the seedling stage, transplanting period, seedling stage and full flowering stage, and carbendazim can be added in an appropriate amount during the rape seedling stage, which can prevent rapeseed root rot.

2. In the rape transplanting period and seedling stage, there will be mold disease and aphids to harm rapeseed, at this time, you can use an appropriate amount of dimethoate mixed with water for spraying control.

3. In the full flowering period of rapeseed, it is necessary to prevent and control sclerotinia sclerotinia disease, and at this time, methyl tobuzin or Pythium can be used for prevention and control.

4. When applying herbicides to rapeseed, it is generally selected after 10 a.m. and before 4 p.m., and the effect of weeding is better during this time; If you spray an insecticide, you generally choose to spray before 10 a.m. and after 4 p.m., when the spraying effect is better.

The planting time of winter rape is generally planted in September and harvested at the end of May, but there are also some areas that are sown in late September, and the planting time is different in different regions, and everything is subject to the actual local situation.

Rapeseed should be ploughed in the fertilization of the soil, the cultivation can be slightly deeper, and the vigorous rape cultivation should also be deepened, in order to better control the growth of rapeseed, so that the seedlings grow into strong seedlings. In the cold years and areas of winter, the overwintering rape should be protected from freezing and moisturizing, and when cultivating and loosening the soil, attention should be paid to cultivating the soil Yonggen, in order to effectively enhance the cold resistance of rapeseed.

Rape flower turned over and returned to the field, make green manure for organic rice, after decay and fermentation, form soil pores, more than half a month can be converted into organic fertilizer, nutrients return to the field, high yield, good fertilizer efficiency, improve soil physical and chemical properties at the same time, but also improve soil structure, improve soil nutrients, soil at this time also has a certain insecticidal and disinfection effect.

Summary. Hello dear. To control insects on rapeseed, acetamiprid, pymetronics, dimethoxam, carbofuran, thiamethoxam, thiamethoxam, deltamethrin, anti-aphid and other drugs can be used.

The use of insecticides pymetrozine, carbofuran, acetamiprid, thiamethoprid and other drugs to control aphids is not effective, which may be related to improper application methods such as insufficient dosage and uneven application. In addition, the aphids at the seedling stage of rape mainly swarm on the back of the leaves, and focusing on spraying on the back of the leaves is conducive to improving the control effect.

Hello dear. To control insects on rapeseed, acetamiprid, pymetronics, dimethoxam, carbofuran, thiamethoxam, thiamethoxam, deltamethrin, anti-aphid and other drugs can be used. The use of insecticides pymetrozine, carbofuran butylthione, acetamiprid, thiamethoprid and other drugs to control aphids is not effective, which may be related to improper application methods, such as insufficient use of unprecedented dosage and uneven application.

In addition, the aphids at the seedling stage of rape mainly gathered in the leaf back of the dangerous fiber to remove the damage, and the focus on spraying the back of the leaf was conducive to improving the control effect.

Aphid control methods in rape fields: 1Chemical control of aphid plant rate of 10% at seedling stage, 1-2 aphids per plant, 10% of the stems or inflorescences of the flowering stage of the sprout have aphids, and each branch has 3-5 aphids, with the following pesticides:

Avi perchlorine emulsifiable concentrate or toxicity 1000-2000 times liquid, sharp red wettable powder 1000 times liquid, 37% perchlorine * malathion l000-2000 times liquid, dichloride emulsion 3000 times liquid 2Seed treatment with 20% aphid pine wettable powder 1 kg 100 kg, or methyl thiocyclophos, insecticidal phosphorus, carbofuran seed dressing, can prevent aphids at the seedling stage. 3.

Cultivation and control cover about 50% of the ground with silver-gray, milky white and black mulch, which has the effect of repelling aphids and preventing viral diseases. 4.Biological coarse control feeding, release of aphid cocoon peaks, lacewings, ladybugs, aphid-eating flies and aphid molds can reduce aphid damage.

Rapeseed aphid control should be applied in three stages: the first is the seedling stage (3 true leaves); The second Rock Trail Circle Period is the early stage of Honda's current bud; In the third period, more than half of the rape plants are mossed up to about 10 cm in height. But these three periods also depend on the number of aphids to determine the number of pesticides, especially in the pod-setting stage, attention should be paid to the occurrence of aphids, if the number is large, still to apply pesticides to control.

Rapeseed is a crop with high economic value, not only as a vegetable food, but also as a raw material for edible oil. The market is loved by consumers. However, in the process of growing rapeseed, farmers often find that oilseed rape has a variety of pests and diseases, which affect its yield.

So, what are the main symptoms and control methods of rape pests and diseases? Let's find out.

1.Downy mildew.

The disease mainly affects leaves and flowers. In the early stage of the disease, small green spots appear, and in the later stage, the macula expands into yellow spots, white mildew, the peduncle is infected, the petals become thickened, and there is no fruit.

Control methods: select disease-resistant varieties, strengthen field management, reasonable dense planting, strengthen phosphorus and potassium fertilizer application, timely drainage after rain, control diseases caused by humidity, and use 35% methafen mixed seeds before sowing. During the sprouting stage, spray 500 times of 75% chlorothalonil wetting powder or 500 times of 58% methalinyl manganese-zinc wetting powder, spray once every 7 10 days, and spray 2-3 times continuously, the effect is very good.

2.Sclerotinia sclerotiorum.

When the stem is infected, the light brown spots develop into long striped spots, which are whorl-shaped, brown at the edges, and have high humidity, which wilts the stems and branches above the diseased area. The onset of leaf disease will appear yellow-brown lesions, and the diseased leaves are easy to penetrate. When the petals become infected, they become soaked in water, gradually turn pale white, and then decay.

Control methods: select disease-resistant varieties according to local conditions, strengthen water and fertilizer management, remove old diseased leaves in time, reduce pathogenic bacteria, and use 1000 times liquid or 1500 times liquid 50% humic acid urea wetting powder to prevent and control diseases after the onset of disease, and the effect is very good. The results showed that the disease-resistant varieties were disease resistant, the water and fertilizer management was strengthened, the old and diseased leaves were removed, the pathogenic bacteria were eliminated in time, and the pathogenic bacteria were reduced.

3.White rust.

It mainly harms leaves, stems, peduncles and other parts. After infection, the leaves appear with light green spots, yellow dots gradually change, and white lacquer bubbles grow on the back of the leaves. After the peduncle appears, the top is swollen and curved, and the petals are thick green and not firm.

Control methods: remove the diseased body in time after harvesting, focus on reasonable fertilization, strengthen the application rate of phosphorus and potassium water-soluble fertilizer, improve the disease resistance of rapeseed, soak the seeds with 10% brine before sowing, and control them with 25% methalene-sulfamine wetting powder 800 times or 58% methalene-zinc wetting powder 500 times after the disease, and spray evenly to improve the drug effect.

The comprehensive control method of eliminating the source of bacteria, strengthening the disease resistance ability of plants and the protection of key pesticides was adopted to control the occurrence and damage of sclerotinia sclerotiorum in rapeseed. First of all, the selection of disease-resistant harvest varieties, which have the characteristics of firm stems, lodging resistance and short flowering period, can play an active role in controlling or reducing the damage of Sclerotinia sclerotinia in rapeseed. Secondly, after screening and water separation, in order to eliminate the sclerotia mixed in the seeds, then use 10 salt water to select the seeds, eliminate the floating sclerotia, and then wash with water, dry and sow seeds.

It is necessary to pay attention to maintaining the porosity of the soil, to properly turn the soil to ensure the permeability of the soil, and then also pay attention to the use of chemicals, and try not to choose the largest one.

Pay attention to the growth of plants, reasonable use of fertilizers, reasonable use of pesticides, pay attention to the ratio, pay attention to uniform use.

It is necessary to pay attention to the planting aspect, but also to the cultivation aspect, but also to the soil aspect, as well as the environmental aspect, but also to the water and fertilizer aspect.

In the early stage of growth, rapeseed beetle, rape jumping beetle and other serious damage to the leaves, you can soak the seeds with medicine before sowing, and you can also use elixir powder to kill pests after the emergence of seedlings. Late aphids,Cabbage worms, diamondback moth and other serious harm to the growth of rapeseed, can be used to kill aphids with aphids, with sweep to kill cabbage insects, with larval urea to kill diamondback moth. It is also availableSeven-star ladybugand other natural enemies for prevention and control.

Rapeseed cultivation method.

Land selection and land preparation: rapeseed has a strong adaptability, so the requirements for the soil are not so strict, but for the more clay land, it is necessary to pay attention to turning over the land to dry for a few days when preparing the land, and water the land again before sowing, and then sprinkle compound fertilizer and turn the soil again after two days.

Planting method: There are two ways to grow rapeseed, the first is to direct seed, rapeseed.

Sow seeds in rows at certain intervals, and when the seedlings grow, remove the denser areas and use them for cooking. The second way is to cultivate rape seedlings first, and then plant them one by one at certain intervals.

Field management: When the rape grows to 15 to 20 cm, the vegetable field is fertilized and weeded once, this time with urea.

The purpose is to grow seedlings, and when the rape grows to about 40 centimeters, it is a secondary fertilization, and this fertilization is farmhouse fertilizer. The last fertilization is to spray boron fertilizer before flowering, which will help to make the fruit more abundant later.

Disease precautions.

The common diseases of rape are sclerotinia sclerotinia and cataplexy at the seedling stage, which means that you should be diligent, clean up and remove water stains in the field in time, and reduce the moisture. Cataplexy at the seedling stage needs to be sprayed with a special agent. Most growers know that if the rape blooms in winter, it will lead to a significant reduction in the yield of the following year, so in order to prevent this problem, farmers will spray paclobutrazol in advance.

Harvest. Harvesting must be timely, too early there are still a lot of unripe, late then all will fall, so the general harvest time is when the whole rape horn is yellow-green, this is the most suitable period for harvesting, after harvesting to dry, threshing, and then a detailed screening can be.

The larvae of the cabbage worm bite the leaves of rapeseed, only eat the mesophyll before the 2nd instar, leaving a layer of transparent epidermis, and after the 3rd instar, the leaves appear holes or missing entries, and the leaves are all eaten up in severe cases, leaving only coarse leaf veins and petioles, resulting in extinction. When cabbage insects feed, they excrete fecal contamination while feeding. The larvae had 5 instars, and most of them were damaged on the back of the leaves before the 3rd instar, and turned to foliar nibbling after the 3rd instar, and the feeding volume of the 4-5th instar larvae accounted for 97% of the total feeding volume of the whole larval stage.

Prevention and control methods: 1. Agricultural prevention and control. Clean the field, after rape harvest, remove the old leaves of the field in time, reduce the breeding place of the cabbage worm and eliminate some pupa.

2. Chemical control. Generally, about 1 week after the peak of eggs, that is, before the larval hatching period to the 3rd instar larvae, the following agents can be used:

1) 30-50 grams of 2% vegetable insecticide and acaricide, spray 50 kg of water or 750-1000 times of high-efficiency BT wettable powder, or 2500-3000 times of aveanzizo emulsifiable concentrate.

2) 10% annihilation EC 5-10 ml mu, 10% depletion suspension agent 10 ml mu, 5% kung fu pyrethrin EC and 5% rifling EC 2000-3000 times or other pyrethroid EC spray to prevent and control the void.

3) 20% chlorpyramide No. 1 suspension and 25% chlorpyramide No. 3 suspension 1000 times liquid spray control. Prevention and control should pay attention to grasp the appropriate period of prevention and control, in the field egg period, larval orange hatching early spraying, according to the habit of cabbage insects, in the morning or evening on the back of the leaves of the plant evenly sprayed, can effectively prevent and control the harm of cabbage insects.