Abamectin has stomach poisoning and contact killing on mites and insects and cannot kill eggs. The mechanism of action differs from that of general insecticides in that it interferes with neurophysiological activities and stimulates the release of gamma-aminobutyric acid, which inhibits the nerve conduction of arthropods. A vitamin salt is a new high-efficiency semi-synthetic antibiotic insecticide synthesized from the fermentation product avermectin B1. It has the characteristics of ultra-high efficiency, low toxicity (nearly non-toxic), low residue, pollution-free and other biological pesticides. . Here's how to choose between the differences between avermectin and carbaryl:
The avermectin series of compounds we are talking about now actually include three categories: abamectin, ivermectin and emamectin. Abamectin is what we call avermectin. Ivermectin is mainly used in veterinary drugs. The benzoate of emamectin is emamectin benzoate (referred to as Avi salt). What is the difference between avermectin, ivermectin and carbaryl? As mentioned earlier, avermectin was mainly used as a parasitic agent. Although it is an excellent veterinary insect repellent, it has been found to have low toxicity to humans, but oral toxicity is high. There is a contradiction when it is made into an oral preparation: the dosage is too low, the effect is not good, the dosage is too high, and the safety is not good. In order to improve this deficiency, Merck has modified its chemical structure and screened two new compounds, ivermectin and emamectin. Ivermectin significantly improves the acute oral toxicity of humans and animals, so veterinary avermectin repellents are generally ivermectin components. Emmacin expands the insecticidal spectrum of avermectin and overcomes the poor effect of avermectin on lepidopteran pests. The preparation of emamectin benzoate is a beta salt. Therefore, ivermectin and carbaryl salt are upgraded and improved products of avermectin. Ivermectin is less toxic and is mainly used on animals (and its structure is more stable, and it is also the world's largest sold avermectin series). The activity of methicillin is much higher than that of avermectin (the stomach toxicity is 2146 times that of avermectin), and it shows extremely high activity against lepidopteran pests (abaverin against lepidoptera and other lepidopteran) The effect of the target pest is not good, but the Awei salt is special for Spodoptera litura. These are the differences between them. To sum it up in one sentence: avermectin is an effective agent that can be used in almost all crops to prevent almost all pests, and it is a kind of activity that is significantly higher than avermectin. Similar agents.
It is an upgraded and improved product of avermectin, and its activity is much higher than avermectin. For example, its stomach toxicity is 2146 times that of avermectin. Therefore, under normal circumstances, the effect of the vitamin A is significantly better than the avermectin. However, when it comes to practical application, we will also encounter why the prevention of Plutella xylostella is not as good as that of avermectin. Below we analyze the reasons, another important property related to the avermectin series is the law of positive temperature coefficient. Simply put, the insecticidal virulence (especially stomach virulence) of the avermectin series to pests increases with increasing temperature. However, the magnitude of the increase in virulence of carbaryl and avermectin with increasing temperature is inconsistent. At 16 °C, the activity of the same content of carbaryl salt is 2-3 times that of avermectin. From 16 °C to 22 °C, the virulence of avermectin (both referred to as stomach toxicity) is increased by about 6 times. The virulence of the acevar salt is only increased by 2-3 times, that is to say, the toxicity of the same content (note the same content) of avermectin and carbaryl salt is actually comparable to that at about 22 °C. However, we know that the avermectin content used in production is generally higher than that of the carbaryl salt (mostly 1% or 0.5% of the production of carbaryl salt, while avermectin is generally 1.8% or 2%), the dilution factor Generally, the vitamin A salt is higher than avermectin (1000-1500 times avermectin and 2000-3000 times salt), which results in the effective content of avermectin in the actual use is much higher than that of the salt. As a result, the effect of avermectin seems to be superior to the one-dimensional salt at around 22 °C. And we know that the optimum temperature of Plutella xylostella is just about 22 °C, which means that Plutella xylostella will occur at this temperature, so it will appear that the effect of KM salt on P. xylostella is not as good as that of Abamectin.
As the temperature rises, above 25 ° C, the virulence of the vitamin A salt is greatly increased, and can even be increased by more than 1000 times, while the virulence of avermectin is limited (several times to 10 times). So at this time, the advantages of the Avi Salt are really being played. The occurrence of the leafhopper is generally above 28-30 ° C, so the effect of preventing the leaf roller is that it should be a salt of a venetian salt is much better than avermectin. The occurrence of Spodoptera litura is generally higher in the high temperature and drought, that is, during the July-October period (summer), the effect of the vitamin A is better than the avermectin.
Through practical analysis, we can see that the effect of the use of carbaryl and avermectin depends mainly on the temperature difference. Below 22 ° C (or even 25 ° C), avermectin is recommended, and in high temperature conditions (above 25 ° C) It is recommended to use the prevention of the use of the salt of the methadone to exert the advantages of the two agents and achieve good control effects. It seems that the rational use of pesticides will have a very different control effect.
Decoration Honeycomb Core Panels
Decoration Honeycomb Core Panels,Aluminum Honeycomb Core Panels Design,Aluminum Honeycomb Core Panels Explained,Aluminum Honeycomb Core Panels Dimensions
Jinan Xinhai Aluminum Industry Co., LTD. , https://www.jnxinhai-alu.com