It is an upgraded and improved product of avermectin, and its activity is much higher than avermectin. For example, its stomach toxicity is 2,146 times that of avermectin. . Therefore, under normal circumstances, the effect of the Avitamin salt is significantly better than the avermectin, and the effect of controlling the A. sinensis is better than that of the avermectin. However, we found a strange phenomenon in production, that is, avermectin is better than P. sinensis in controlling Plutella xylostella. Why?
An important property of the avermectin series involved here is the law of positive temperature coefficient. Simply put, the insecticidal virulence (especially stomach toxicity) of the avermectin series on pests increases with increasing temperature.
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 to 3 times that of avermectin. From 16 to 22 ° C, the virulence of avermectin (both referred to as stomach toxicity) is increased by about 6 times. The virulence of the salt of the vitamin A is only increased by 2 to 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 It is also generally higher in the vitamin A than in the avermectin (1,000-1,500 times avermectin and 2,000-3,000 times in the vitamin A), which results in the effective content of avermectin being much higher than that of the vitamin A 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 exactly 22 °C, which means that Plutella xylostella will occur at this temperature, so it will appear that the effect of KV is not as good as that of Abamectin.
As the temperature rises, above 25 ° C, the toxicity of the vitamin A salt is greatly increased, and can even be increased by more than 1,000 times, while the virulence of avermectin is limited (i.e., several times to ten times). So at this time, the advantages of the Avi Salt are really being played. The occurrence of leaf roller is generally 28 to 30 ° C, so the effect of controlling leaf roller is better than that of avermectin. Spodoptera litura usually occurs during high temperature and drought, that is, during the period from July to October (summer summer), the effect of thyme is better than avermectin.
Therefore, when using avermectin and a vitamin salt, pay attention to the time and temperature of use to maximize the effect of the drug. Between 16 and 22 ° C, avermectin may be better than a vitamin salt; above 25 ° C, the effect of the insecticide is better.
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(Source: The thing about pesticides)
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