In order to reduce the damage caused by insect pests to crops, we have produced a large number of different insecticides. The mechanism of action of various insecticides is the same, so how do we choose the ones that are really suitable for our crops? Today we will talk about Two insecticides with similar mechanisms of action ：imidacloprid and thiamethoxam.
We farmers are very familiar with imidacloprid, so thiamethoxam is a new insecticidal star. What are its advantages over the older generation?
01. Difference analysis of imidacloprid and thiamethoxam
Although the two mechanisms of action are similar (can selectively inhibit insect central nervous system nicotinic acid acetylcholinesterase receptor, thereby blocking the normal conduction of insect central nervous system, causing paralysis and death of pests), thiamethoxam has 5 major Advantage:
Thiamethoxam is more active
The main metabolite of thiamethoxam in insects is clothianidin, which has a higher affinity for insect acetylcholine receptors than thiamethoxam, so it has higher insecticidal activity;
The activity of the hydroxylated metabolites of imidacloprid was reduced.
Thiamethoxam has high solubility in water
The solubility of thiamethoxam in water is 8 times that of imidacloprid, so even in arid environment, it does not affect the absorption and utilization of thiamethoxam by wheat.
Studies have shown that in normal moist soil, thiamethoxam shows a similar control effect as imidacloprid; but in drought conditions, it is significantly better than imidacloprid.
Low thiamethoxam resistance
Since imidacloprid has been on the market for nearly 30 years, the development of insect resistance has become increasingly serious.
According to reports, the brown fly wind, cotton aphid, and chive larval mosquito have developed certain resistance to it.
The risk of cross-resistance between thiamethoxam and imidacloprid on brown planthoppers, cotton aphids and other pests is very low.
Thiamethoxam can enhance crop resistance and promote crop growth
Thiamethoxam has an advantage that other insecticides cannot match, that is, it has the effect of promoting roots and strong seedlings.
Studies have shown that Thiamethoxam can activate plant stress resistance proteins, and at the same time produce auxin, cytokinin, gibberellin, abscisic acid, peroxidase, polyphenol oxidase, and phenylalanine ammonia lyase in plants. As a result, thiamethoxam in turn makes crop stems and roots more robust and enhances stress resistance.
Thiamethoxam lasts longer
Thiamethoxam has strong leaf conduction activity and root systemic properties, and the agent can be quickly and fully absorbed.
When it is applied to soil or seeds, thiamethoxam is quickly absorbed by the roots or newly budding seedlings, and is transported upwards to all parts of the plant body through the xylem in the plant body. It stays in the plant body for a long time and degrades slowly. The degradation product clothianidin has higher insecticidal activity, so thiamethoxam has a longer lasting effect than imidacloprid.
Post time: Jan-11-2021