Which is the best choice of methylphenidate or avermectin? The targets of the prevention and control are all here!

Pesticide assistant: distributor farmers must, free pesticide three certificates, pesticide quotations, crop disease and pest control; the most practical plant protection article sharing platform! Welcome to the editor-in-chief WeChat communication: junze5678, contributed by: [email protected]

Peak period. Methylphenidate and avermectin are currently common agents in the market. We all know that they are biological agents and are related, but do you know how to choose different control objects?

Avermectin is an ideal agent that can be used in almost all crops to prevent almost all pests, and methylphenidate is a similar agent with significantly higher activity than avermectin. The activity of methylphenidate is much higher than that of avermectin, the insecticidal activity is 1 to 3 orders of magnitude higher than that of avermectin, and the activity of the larvae of lepidoptera and many other pests and mites is extremely high, which has both gastric toxic effect and touch killing effect, and also has a good insecticidal effect at very low doses. Because different pests have different temperature due to their own living habits, the temperature of insect pests is different, and the correct choice should be made according to the life habits of pests when using pharmaceuticals. The occurrence of curly leaf borer is generally above 28 ~ 30 ° C, so the effect of preventing curly leaf borer should be methyl vitamin salt is much better than avermectin. The occurrence of twill moths generally occurs in high temperature and drought, that is, between July and October of each year (mid-summer), and the effect of methyl vitamin salt is better than that of avermectin. The most suitable temperature for small cabbage moths is about 22 ° C, that is to say, at this temperature, small vegetable moths will occur largely, so the effect of methyl vitamin salt to control small cabbage moths is not as good as avermectin. A vitamin salt Applicable crops: Methyl vinyl salt is highly safe for all crops in protected areas or at 10 times the recommended dosage, and western countries have used it in many food crops and cash crops. Consider that it is a rare green pesticide. China should first use tobacco, tea, cotton and other cash crops and all vegetable crops to control insect pests. Pest control: Beavitaline has unmatched activity with other pesticides for many pests, especially for Lepidoptera and Diptera, super efficient, such as red-banded leaf curl moth, smoke aphid nocturnal moth, cotton bollworm, tobacco moth, small cabbage moth armyworm, beet nocturnal moth, dryland nocturnal moth, nocturnal moth, kale silver moth, cabbage butterfly, cabbage heart borer, kale horizontal striped borer, tomato moth, potato beet, Mexican ladybird, etc. 1. Beet nocturnal moth The activity of methylphenidate against beet noctuidae larvae is 13 times that of avermectin (3-instar larvae, the same below), 53 times that of cis-cypermethrin, 57 times that of flullingurea, and 119 times that of chlorpyrifos. The gastoxic activity of methylphenidate against beet moths is 1500 times higher than that of avermectin. 2. Cotton bollworm The virulence of methyl vitamins against cotton bollworms is 146.7 times that of highly effective cypermethrin and 210.7 times that of methyl parathion. The gastric toxicity of methylphenidate against bollworm is 4721 times that of methyl parathion. The 0.2% methyl vitamin salt emulsion was diluted 4000 times to control the 4th instar cotton bollworm, and the mortality rate reached 98.5%, which was significantly higher than the control effect of 50% methyl parathion emulsion 2000 times (30.5%) and 0.2% avermectin 1000 times (45.5%). The use of 1% methyl vitamin ec can control cotton bollworm, the duration of efficacy can be up to 10 days, at a dose of 1% methyl vitamin salt ec 30 ml, 60 ml, 90 ml, its control effect is higher than octyl chloride emulsion, and there is no adverse effect on cotton growth. 3. Small cabbage moth Small cabbage moths that have become resistant to organophosphorus, carbamates, organochlorine, pyrethroids, and chitin inhibitor insecticides, methyl vitamin salt will have a good control effect on it, but small cabbage moths that have become resistant to avermectin should be used with caution. Using 0.5% methyl vitamin salt emulsion diluted 3000 times to control the small vegetable moth, the insecticidal effect was 98.4% in 7 days. Using 1.0% methyl vitamin salt emulsion diluted 8000 times to control the small cabbage moth, the insecticidal effect was 86.51% in 6 days, and the insecticidal effect was 91.45% in 6 days. The effect of 4.50% high-efficiency cypermethrin emulsion dilution 1667 times on the control of cabbage moth was only 69.04% 4. Vegetable pests Using 1.0% methyl vitamin salt emulsion diluted 8000 times to control vegetable insects, the insecticidal effect of 8d was 86.03%, diluted 6000 times to control vegetable insects, and the 8d insecticidal effect was 96.85%. 1% methyl vitamin salt can generally be diluted 6000 times for the control of green worms, and the effect is comparable to the insecticidal effect of 4.5% high-efficiency cypermethrin dilution of 1667 times. 5. Methene salt has high activity on leaf-eating pest larvae, cotton red leaves and mites, but has a slightly poor effect on aphids. After a large number of clinical discoveries in use, methyl vitamin salt can not be used continuously during the growth period of crops, it is best to use it after the first stage of insect onset, and use other pesticides at intervals during the second insect onset! Notes: 1. When applying drugs, there should be protective measures, wear masks, etc. 2, high toxicity to fish, should avoid polluting water sources and ponds. 3, toxic to bees, do not apply during the flowering period. Avermectin Mode of action, features: Touch killing, stomach poison, strong penetration. It is a macrolide disaccharide compound. It is a natural product isolated from soil microorganisms, which has a touch killing and gastric toxic effect on insects and mites and has a weak fumigation effect, no systemic effect. However, it has a strong osmotic effect on the leaves, killing pests under the epidermis and lasting a long period of time. It does not kill eggs. Its mechanism of action is different from that of general insecticides in that it interferes with neurophysiological activities, stimulates the release of r-aminobutyric acid, and r-aminobutyric acid has an inhibitory effect on the nerve conduction of arthropods, mites, mites and insects appear paralyzed after contact with larvae and agents, inactivity does not feed, and dies after 2 to 4 days. Because it does not cause rapid dehydration of insects, its lethal effect is slower. However, although it has a direct killing effect on predatory and parasitic natural enemies, it has little damage to beneficial insects because there are few residues on the surface of the plant. It has a pronounced effect on root node nematodes. 3. It is highly toxic to silkworms, and there is obvious poisoning and killing effect of silkworms 40 days after spraying mulberry leaves. 4, toxic to bees, do not apply during the flowering period. 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% emulsion, 0.15%, 0.2% hypertonic, 1%, 1.8% wettable powder, 0.5% hypertonic microemulsive oil, etc. How to use: 1, the control of small cabbage moths, cabbage insects, in the young larval stage use 1000 ~ 1500 times 2% avermectin emulsion + 1000 times 1% methyl vitamin salt, can effectively control its harm, 14 days after the drug on the small cabbage moth prevention effect is still up to 90 ~ 95%, the control effect of the green worm can reach more than 95%. 2. Control and control of pests such as golden moth, leafminer moth, leafminer fly, American spotted flyer and vegetable whitefly, use 3000 to 5000 times 1.8% avermectin emulsion + 1000 times high chlorine spray during the peak period of egg hatching and larval occurrence, and the prevention effect is still more than 90% after 7 to 10 days after the drug. 3. Control beet moth, use 1000 times 1.8% avermectin emulsion, and the prevention effect is still more than 90% after 7 to 10 days after the drug. 4. Control of leaf mites, gall mites, tea mites and various resistant aphids of fruit trees, vegetables, grain and other crops, use 4000 to 6000 times 1.8% avermectin emulsion spray. 5. For the prevention and control of vegetable root-knot nematode disease, use 500 ml of 1.8% avermectin per mu, and the prevention effect is 80 to 90%. 1. The drug has no systemic effect, and attention should be paid to spraying evenly, meticulously and thoroughly when spraying. 2. Can not be mixed with alkaline pesticides. 3. Do not spray at noon in summer. 4. Store this product away from high temperature and fire source. 5. Stop applying the drug 20 days before harvesting. Source: China Pesticide Industry Association, copyright belongs to the original author

Today Xiaobian solemnly recommends a new public number that can help the majority of large planters get rich [high-end agriculture], learn advanced planting experience, master policy dividends, teach you how to take subsidies, and quickly press to identify the following QR code to pay attention to it!

-------- both are good, please pay attention---------

Pay attention to pesticide assistants, free pesticide three certificates, daily pesticide quotations, crop disease and pest control; the most practical plant protection article sharing platform!