Does avermectin have an effect on nematodes?

Avermectin is an agricultural veterinary insecticide and acaricide, and a macrolide disaccharide compound. Avermectin has contact killing and stomach toxicity effects on insects and mites and has a weak fumigation effect, and the lethal effect is slow. However, there is less residue on the surface of the plant.

Recently, many farmers have reported that avermectin is not effective in controlling root-knot nematodes, and some farmers even say that there is no effect at all. Abamectin has a strong repellent effect on root-knot nematodes, ectoparasites and other arthropods.

Why can't they report that the effect is not good? By communicating with them, we learned that the effect is not good, and it is related to their improper use. Many farmers feel that it is very troublesome to irrigate the roots with avermectin, so they wash avermectin into the ground with water to control root-knot nematodes, and the effect must be greatly reduced.

Because the use of avermectin multiples of 1500 to 2500 times, its effect can be guaranteed. That is to say, when flushing with water, it should be ensured that each square of water is added with about one pound of avermectin. But if this concentration is not reached, it is difficult for avermectin to fully exert its effect, which is why farmers report that avermectin has poor effect on root-knot nematodes.

In the production of vegetables in the north and south of China, root-knot nematodes can be affected to different degrees. Especially in the greenhouse vegetable production area, due to the prominent phenomenon of heavy stubble, it is easy to cause root-knot nematode disease, and the yield loss is generally 10-30%, and the serious case is as high as more than 50%. At present, there are many comprehensive measures for the prevention and control of root-knot nematode disease, but the selection of high-efficiency agents is the preferred means for the prevention and control of the disease, which has unique advantages for the rapid reduction of nematode density and emergency control, but as a nematicidal pesticide, it will inevitably have negative effects.

In order to pursue its benefits and avoid its harms, we have summarized the relevant research progress and practical experience in recent years, and preliminarily launched pollution-free nematicides for vegetables and their rational use technologies. In order to help vegetable producers to prevent and control root-knot nematode disease safely, environmentally friendly and cost-effectively. Avermectin has a good inhibitory and control effect on the occurrence of soil-borne diseases of crops, especially for root-knot nematodes, cyst nematodes, stem nematodes and other soil-borne parasites.

According to experts, avermectin has high activity and high sensitivity to root-knot nematodes, so only a small dose is needed to control root-knot nematodes, and its control cost is relatively "close to the people". According to statistics, Foshan Yinghui's Ligan Sand is currently the leading brand of avermectin threadicide, with an application rate of about 2500-3000 grams per mu and a cost of about 90-120 yuan, which not only occupies an advantage in Avi threadicide, but also takes a leading position even if compared with the prevention and control cost of other components. In addition, some nematicides on the market are only effective against the young larvae of root-knot nematodes, but are ineffective or even ineffective against the adults, older worms and eggs of root-knot nematodes.

However, due to the unique mechanism of avermectin, the acetylcholinesterase inhibition of root-knot nematode is irreversible, and root-knot nematode will not appear to fake death, and the control of root-knot nematode is very thorough. Avermectin has strong diffusion ability in soil, is not easy to combine with soil particles, has high water solubility, and can achieve high control effect even in arid soils.

Effect of avermectin on different pests. Abamectin is mainly used for the control of diamondback moth, green worm, cotton bollworm, tobacco green worm, beet armyworm, leaf miner, spotted loon, aphid, psyllid, peach heartworm, leaf mite, gall fly, etc.

Normally, to control these pests, we can choose to spray with emulsifiable concentrate 2000 4000 times.

To control leaf-eating pests, cabbage insects, diamondback moths, leafminer flies, etc., spray 10 20 ml of emulsifiable concentrate with water per mu;

To control boring pests, cotton bollworms, etc., spray 40 80 ml of emulsifiable concentrate with water per mu; To control pear psyllid, spray evenly with 8,000 and 10,000 times of emulsifiable concentrate.

Abamectin is mainly effective in treating lepidopteran pests, such as cabbage moth and leaf borer.

Abamectin is generally used to control lepidopteran and homoptera pests on vegetables, fruit trees, flowers, tobacco, cotton, and food crops, such as diamondback moth, beet armyworm, Spodoptera litura, aphid, red spider, gall mites, scale insects, thrips, rice leaf roller borer and other pests.

At present, avermectin is mainly used to roll leaf borer on rice, due to the long use time, generally avermectin will also be compounded with tetrachlorantranliprole, chlorantraniliprole, etc. to control leaf roller borer.

Nowadays, the rice market has used a high dose of avermectin to fight resistant dimorphic borer, in the case of compounding other agents, the effect is not bad, avermectin is used less on vegetable diamondback moth, mainly because the resistance is too great.

How to use avermectin:

1. For the control of vegetable diamondback moth, Spodoptera exigua, Spodoptera litura, you can use 30 40 ml of avermectin emulsifiable concentrate per mu and spray it evenly with water.

2. For the prevention and control of fruit tree aphids, red spiders and gall mites, you can spray 30 40 ml of avermectin EC with water per mu.

3. To control the pests of aphids, scale insects and thrips of flowers, you can spray 30 50 ml of avermectin EC with water per mu.

4. For the prevention and control of rice leaf roller, 30 45 ml of avermectin emulsion can be used per mu, and evenly sprayed with water.

Abamectin is an antibiotic widely used in agriculture and aquaculture, but it does not work against certain insects. The following is a description of insects that do not respond to avermectin.

First of all, avipantomycin is ineffective against bees. Bees are important pollinators and play an irreplaceable role in agricultural production. However, bees also face the threat of various diseases and parasites.

Since avermectin has no insecticidal effect on bees, this antibiotic cannot be relied upon for bee protection.

Secondly, avermectin is also ineffective against aphids. Aphids are a widespread pest that feeds on plant sap and spreads viruses. Many chemical pesticides are effective in controlling aphid populations, but avermectin is not one of them.

If avermectin is used to control aphids, it will have ineffective results.

Finally, avermectin is also ineffective against mites. Mites are tiny parasites that invade the human or animal body and cause various diseases. Although there are many chemical apocalyptics that can effectively kill mites, avermectin cannot have a good insecticidal effect.

In summary, avermectin is widely used in agriculture and aquaculture, but it is ineffective for some insects. Therefore, when using antibiotics for insect control, it is necessary to choose the right agent for the target insect to avoid ineffective waste.

Avermectin is an antibiotic insecticide and acaricide, which has contact killing and stomach toxicity effects on insects and mites, and has a weak fumigation effect, no systemic effect, has a strong osmotic effect on leaves, can kill subcutaneous pests, and has a long effective period. It has strong insecticidal, acaricidal and nematicidal activities, has a wide insecticidal spectrum, is safe to use, and pests are not easy to develop resistance.

Applicable crops and control objects.

It is widely used in grains, cotton and oil, fruits and vegetables, fruit trees, flowers and plants, and is mainly used to control mites, diamondback moths, cabbage worms, beet armyworms, jumping beetles, leafminer moths, heartworms, pear psyllids and other pests.

Use technology. 1. To control diamondback moth, beet armyworm and cabbage worm, generally 25-35 ml of 2 emulsifiable concentrate or 30-40 ml of emulsifiable concentrate per mu, sprayed with 45-60 kg of water.

2. To prevent and control red spider and cotton bollworm, it can be sprayed in the early stage of the occurrence of pests or cotton bollworm incubation period, generally with 70-100 ml of 2 emulsifiable concentrate or 80-120 ml of emulsifiable concentrate per mu, and spray with 45-60 kg of water, which has a certain concomitant effect on aphids.

3. The control of pear psyllids can be sprayed in the early stage of nymphs to before being completely covered by mucus, and each generation can be sprayed evenly once, and 2 emulsifiable concentrate 3000-4000 times or emulsifiable concentrate 2500-3500 times can be sprayed evenly.

4. The prevention and control of melons, fruits, vegetables and beans can be evenly sprayed with 2 emulsifiable concentrate 3500-4500 times and emulsifiable concentrate 3000-4000 times.