1. The most effective and pollution-free way to kill locusts in a large area is to sprinkle lime powder. Grasshoppers will fester and die after being polluted by lime powder, and they will also die of physiological acid-base imbalance in alkaline water with lime. However, the strong alkalinity of lime can only be maintained for a short time, and it can be diffused and desalinated after pest control, which is also beneficial to the improvement of strongly acidic old swamp soil.

2. Although killing with highly toxic pesticides is very effective, there will be pesticide residues, which will also have an impact on farmers and future plants. The effect of using dichlorvos with low toxicity and residue is not ideal, so lime is the most reasonable killing method.

What do leeches fear most?

Locusts are mollusks and have no skin protection. Skin is the first protective barrier for animals. Because there is no skin, it is very sensitive to salt. After leeches are sprinkled with salt, the salt and their body fluids form high-concentration saline. High concentration of salt water will make them shrink under stress, promote the exudation of body fluids in their bodies, and lead them to dehydration and death. So don't panic after being bitten by leeches in the wild. Drop a high concentration of salt water on leeches, and they will soon loosen the sucker and fall down to dehydrate and die.