Why can't pesticides be used in excessive amounts to kill insects?
In lawn management, to save on mowing costs, besides mechanical mowing, plant growth regulators can also be used to control lawn growth. For example, people use various plant growth regulators such as paclobutrazol on lawns, which can make the intercellular spaces of turfgrass plant cells smaller and slower to change, make internodes smaller, make leaves thicker, and make the color...
Of course, this current situation is related to farmers' own low level of education, and even more to insufficient or even missing publicity and popularization of pesticide knowledge. In the past, farmers were still very familiar with the names of many pesticides. As batches of highly toxic pesticides withdrew from the market, especially after some highly toxic organophosphorus pesticides withdrew from the market, many environmentally friendly pesticides and new formulations appeared, but farmers knew very little about these new pesticides, or did not understand them at all. This includes many pesticide dealers, whose thinking has not truly changed accordingly, who have not truly realized the significance of banning highly toxic pesticides, and who even operate with the mindset of bystanders: farmers can use whatever pesticide they like, and use it however they like, as long as they themselves can sell the pesticide and make money.
In addition, pesticide dealers themselves are not highly qualified, lack relevant knowledge, and do not know how to learn. They buy and sell pesticides only with an irresponsible and arbitrary attitude, thinking that as long as farmers use the pesticide to kill the insects, it is fine. Therefore, some dealers deliberately let farmers increase the dosage, and based on the size of the pesticide bottle cap, casually teach farmers to mix a few bottle caps of pesticide into one bucket of water. If the bottle cap is small, they tell farmers to mix 3 caps, 4 caps, or even 5 or 6 caps.
Many dealers are afraid that farmers will understand, believing that the less farmers understand, the more they will trust what the dealers say, which is more conducive to their arbitrary sales pitches. For example, when farmers clearly already have a pesticide for controlling aphids, the dealer deliberately says that this pesticide cannot be used and makes the farmers buy another one recommended by the dealer. In this way, one pesticide is sold for one pest, which increases farmers' investment and also damages the environment.