What is a grub? How to control grubs?

What's a grub? How to control grub? Is there any netizen to help guide White grubs commonly known as white earth silkworm, white earth silkworm, is the general term for beetle larvae, mainly to harm underground roots and fruits, it bites off seedlings roots, stems, causing seedlings to die. If it is not controlled in time, it will result in lack of seedlings and broken ridges. Therefore, the cultivation network sorted out the control methods of grubs, the following detailed list for netizens reference. Method 1. When ploughing, 2~3 kg of 5% chlorpyrifos granules are mixed with 20~30 kg of sand to form toxic soil and spread on the surface; or 250~300 ml of 40% chlorpyrifos emulsifiable concentrate is used to irrigate the land to kill eggs and prevent pests from occurring. Method 2. When watering and fertilizing crops for the first time, use 250~400 ml of 40% chlorpyrifos EC per mu to wash with water to ensure effective killing of larvae. Method 3. Spraying 500~800 times solution of 40% chlorpyrifos EC on the active ground and trees of grub adults before laying eggs in the peak period of adults. Method 4. Deep ploughing and fine harrowing, intertillage and weeding, timely watering and no application of undecomposed organic fertilizer can reduce the density of underground pests such as grubs. Method 5. Cut the fresh elm branches into 50~ 70cm long at the peak of emergence of white grubs, spray 500~800 times of 40% chlorpyrifos emulsifiable concentrate evenly on the branches, insert 4~5 branches per mu. Method 6. In the evening, select the tree with more white grubs adults, pile up combustible materials such as crop straw or hay, and shake the tree after ignition, and the adults will fly into the fire. Method 7. The best period of pesticide control can be in the peak incubation period and young larva period of white grubs. 5% chlorpyrifos granules are used for 2~3 kg per mu, mixed with soil evenly, then ditched and applied, and watered once after covering soil; or 40% chlorpyrifos EC is mixed with slag or coarse sand for 380~400 ml per mu. What are the special drugs for underground pests? What should be paid attention to when using seed coating agents?