How to prevent insects on rape and what medicine to use?

To control pests on rapeseed, pesticides should be selected according to different pests. For example, with imidacloprid.

Or bifenthrin or pymetrozine or acetamamide or dime and other drugs to control aphids.

Thrips, etc., use kung fu pyrethrin or deltamethrin or chlorantraniliprole or tetrachlorantraniliprole or Bacillus thuringiensis and other drugs to control green insect pests.

In recent years, due to the continuous planting of crops and the continuous accumulation of pathogenic bacteria, soil-borne diseases have become the most important factor affecting the yield of rapeseed. Among them, rapeseed root rot is particularly serious, which is difficult to detect in the early stage and even more difficult to detect in the later stage. In addition, underground pests (grubs, needleworms) and aphids are also a headache for growers!

The cost of pesticides for the prevention and control of underground pests on the market, such as phosphine, chlorpyrifos, and other high-efficiency and low-toxicity organophosphorus insecticide granules, is about 20-25 yuan per mu, the cost is high, and there are large safety hazards in the process of use. The cost per mu of the whole process of use (25% thiam, pyrrol, and fine nail suspension seed coating agent) is only 10 yuan, which can achieve the effect of insect and disease prevention.

The horror of rape pests and diseases: the serious ones will directly reduce the yield by 50 catties --- 100 catties!

The whole process" - 25% fludioxonil, jingjia, thiamethoxam suspension seed coating agent, in rape insect and disease control, seedling protection, seedling strengthening, reduce yellow leaves, prevent premature aging, increase yield significantly, national verification!

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.

1. Agricultural prevention and control.

1. Remove weeds in and around the field. Dead leaves in the field are concentrated in manure or burned to kill adults, larvae and pupa.

2. Artificial hunting. For crickets, cabbage insects, and aphids, they can be combined with weeding, field seedling setting or transplanting for manual killing or removal of aphid plants; Using the feigned death habit of ape leaf insects, shake the plant to make it fall to the ground, and then hunt and kill it.

Second, the prevention and treatment of pharmaceuticals.

Each mu can choose one of the following agents to add 50 kg of water to the conventional spray: 30 ml of dichloride or baode emulsifiable concentrate, 20 grams of 50% anti-aphid, 20 ml of 48% Lesben emulsifiable concentrate, 40 ml of 20% chrysanthemum emulsifiable concentrate, and 35 grams of 90% insecticidal single raw powder. For areas with serious crickets, it can also be used to kill and control insecticidal single raw powder mixed with corn flour or sweet potatoes during sowing.

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.

<> physical control: clean the countryside, remove the stumps and old leaves and weeds in the field in a timely manner, deeply and carefully rake the ploughing, reduce the stupidity and reduce the source of overwintering insects; Protect the natural enemies of cabbage insects such as the red-eyed Jane bee, the reddish velvet cocoon bee, and the butterfly golden wasp. Biological control:

Before the 2nd instar of the larvae, 1% insecticide emulsifiable concentrate (2000-2500 times liquid) or insecticide emulsifiable concentrate (1000-1500 times liquid) and other drugs were used for spraying.