Which is better for a vitamin salt and avermectin? The control objects are here.
Recently, high temperature and high humidity, high incidence of cotton, corn, vegetables and other crops, the application of a vitamin salt and avermectin has reached its peak. Avidin and avermectin are currently common drugs in the market. Everyone knows that they are biological agents and have a relationship, but do you know how to choose different control objects?
Abamectin is an effective agent that can be used in almost all crops to prevent almost all pests, and it is a similar agent with a significantly higher activity than avermectin. The activity of methicillin is much higher than that of avermectin. The insecticidal activity is 1~3 orders of magnitude higher than that of avermectin. It is highly active against the larvae of lepidopteran and many other pests and mites. It has a stomach poisoning effect and a contact killing effect, and also has a good insecticidal effect at a very low dose.
Because different pests have different temperature of insect pests due to their own habits, the correct choice of pests should be based on the pest habits.
The occurrence of the leafhopper is generally above 28~30 °C, so the effect of preventing the leafhopper is to be a salt of a venetum is much better than that of avermectin.
Spodoptera litura usually occurs during high temperature and drought, that is, from July to October each year (summer summer), the effect of carbaryl salt is better than avermectin.
The optimum temperature for Plutella xylostella is just about 22 °C, which means that Plutella xylostella will occur at this temperature, so it will be less effective to control Plutella xylostella than avermectin.
Emamectin benzoate
Applicable crops:
A vitamin salt is highly safe for all crops at protected sites or 10 times the recommended dosage, and has been used in many food crops and cash crops in Western countries.
Consider it is a rare green pesticide . China should first use it on tobacco, tea, cotton and other cash crops and all vegetable crops to control pests.
Control pests:
A vitamin salt has many activities unmatched by other pesticides, especially for Lepidoptera, Diptera, and ultra-efficient, such as the red-striped moth, the larvae, the cotton bollworm, the tobacco hawk moth, the diamondback moth, the beet Noctuid moth, Dryland moth, Rhododendron chinensis, Brassica chinensis, Cabbage butterfly, Cabbage, Cabbage, Tomato hawk moth, Potato beetle, Mexican ladybug, etc.
1, beet armyworm
The activity of avidin on Beet armyworm larvae is 13 times that of avermectin (3rd instar larvae, the same below), 53 times that of cypermethrin, 57 times that of hexaflumuron, and 119 times that of chlorpyrifos. The gastric toxicity of A. sulphate to Beet armyworm is 1500 times higher than that of avermectin.
2, cotton bollworm
The contact toxicity of avidin to cotton bollworm is 146.7 times that of beta-cypermethrin and 210.7 times that of methyl parathion. The gastric toxicity of the methyl sulphate to cotton bollworm is 4,721 times that of methyl parathion. 0.2% Awei salt oil diluted 4000 times to prevent 4th instar cotton bollworm, the mortality rate was 98.5%, significantly higher than 50% methyl parathion EC 2000 times (30.5%), 0.2% avermectin 1000 times (45.5%) The control effect.
The use of 1% can be used to control cotton bollworm, the duration of action can be as long as 10d, and the control effect is higher than that of octyl chloride emulsifiable concentrate under the condition of 1% methyl salt EC 30 ml, 60 ml, 90 ml. No adverse effects on cotton growth.
3. Plutella xylostella
Already phosphates, carbamates, organochlorines, pyrethroids, Plutella chitin inhibitors become resistant to insecticides, emamectin salt thereof will have a good control effect, but has become A Plutella xylostella, which is resistant to avermectin, should be used with caution.
The Plutella xylostella was diluted 3000 times with 0.5% methyl salt emulsion oil, and the insecticidal effect was 98.4% in 7 days. Using 1.0% Awei salt oil diluted 8000 times to control Plutella xylostella, 6d insecticidal effect was 86.51%, diluted 6000 times to control Plutella xylostella, 6d insecticidal effect was 91.45%. The 4.50% beta-cypermethrin emulsion diluted 1667 times against Plutella xylostella was only 69.04%
4, vegetable pests
Using 1.0% Awei salt oil diluted 8000 times to control cabbage caterpillar, 8d insecticidal effect was 86.03%, diluted 6000 times to control cabbage caterpillar, 8d insecticidal effect was 96.85%.
1% of the vitamin A salt can be diluted 6000 times for the control of Pieris rapae, and the effect is equivalent to the insecticidal effect of 4.56% dilution of 4.5% beta-cypermethrin.
5, Awei salt has high activity on leaf-feeding pest larvae and cotton red leaves and alfalfa, but the effect on aphids is slightly worse.
A vitamin salt has been clinically discovered in use and cannot be used continuously during the growth period of the crop. It is best to use it after the first stage of the insect stage, and use the other pesticide interval during the second stage of the insect stage!
Precautions:
1. Take protective measures when applying the medicine, wear a mask, etc.
2, high toxicity to fish, should avoid pollution of water sources and ponds.
3. Toxic to bees, do not apply during flowering.
Avermectin
Mode of action, characteristics:
Touch, stomach poison, strong penetration. It is a macrolide disaccharide compound. It is a natural product isolated from soil microorganisms. It has a contact and stomach toxicity effect on insects and acarids, and has a weak fumigation effect, and has no systemic action.
However, it has a strong osmotic effect on the leaves, which can kill the pests under the epidermis and has a long residual effect. It does not kill eggs. Its mechanism of action differs from that of general insecticides in that it interferes with neurophysiological activities and stimulates the release of r-aminobutyric acid, while r-aminobutyric acid inhibits the nerve conduction of arthropods, such as mites, mites and insects. The larvae appear paralyzed after contact with the agent, inactive and do not feed, and die after 2 to 4 days.
It does not cause rapid dehydration of insects, so its lethal effect is slower. However, although there is a direct killing effect on predatory and parasitic natural enemies, the damage to beneficial insects is small due to the small residual surface of the plants. It has obvious effects on root-knot nematodes.
Precautions:
1. Take protective measures when applying the medicine, wear a mask, etc.
2, high toxicity to fish, should avoid pollution of water sources and ponds.
3, the silkworm is highly toxic, and the mulberry leaves have obvious poisonous silkworm killing effect 40 days after spraying.
4. Toxic to bees, do not apply during flowering.
5. The last application is 20 days from the harvest period.
Dosage form:
0.5%, 0.6%, 1.0%, 1.8%, 2%, 3.2%, 5% emulsifiable concentrate, 0.15%, 0.2% hypertonic, 1%, 1.8% wettable powder, 0.5% hypertonic microemulsion, and the like.
Instructions:
1. Control Plutella xylostella and Pieris rapae, use 1000~1500 times 2% avermectin EC+1000 times 1% KM salt in the young larva stage, which can effectively control the damage of Plutella xylostella 14 days after drug The effect is still 90~95%, and the control effect on cabbage caterpillar can reach more than 95%.
2. Control pests such as the golden moth, the leaf miner, the leaf miner, the Liriomyza sativae, and the vegetable whitefly, and use 3000~5000 times 1.8% avermectin EC+1000 in the egg hatching period and larval stage. Double-chlorine spray, the control effect is still more than 90% after 7-10 days.
3, control beet armyworm, with 1000 times 1.8% avermectin EC, 7-10 days after the drug control effect is still more than 90%.
4, control fruit trees, vegetables, food and other crops of spider mites, medlar, sassafras and various resistant mites, using 4000 ~ 6000 times 1.8% avermectin EC spray.
5. Prevention and control of vegetable root-knot nematode disease, using 500 ml of 1.8% avermectin per acre, the control effect is 80-90%.
Precautions:
1. The drug has no systemic action. When spraying, it should be sprayed evenly and carefully.
2, can not be mixed with alkaline pesticides.
3. Do not spray at noon in summer.
4. Store this product away from heat and fire.
5. Stop applying the drug 20 days before harvest.
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