What is an internal insecticide?

The liquid can reach all parts of the plant with the water circulation in the plant. To put it another way, let's give an example: 1. In pesticides, aphids feed on the branches and leaves of crops and need to be transmitted through plant juices. So aphids are basically internal inhalation. Pyrethroid pesticides have no internal absorption. However, avermectin is only permeable and has no internal absorption. 2. In the concept of fungicides, there are three categories: protective, therapeutic and eradicative, of which the latter two basically belong to internal inhalation fungicides. 3. Glyphosate in herbicides belongs to internal absorption pesticides, so weeds die 5-7 days after application on leaves, the solution transmits water through plants, and the roots of weeds are killed. It's called getting rid of the root. Internal inhalation insecticide is easy to use, spraying is not necessarily very thoughtful, and can be used in the way of dealing with seeds, saving time and medicine. Internal inhalation of pesticides can also be used to control pests that are hidden in shade, such as aphids and red spiders on the back of leaves. Internal inhalation insecticides are suitable for dry control of plant juice-sucking pests, such as aphids that suck pesticides into their stomachs when piercing crops. From this point of view, the action of internal inhalation of pesticides also belongs to stomach toxicity.