Removal method
1, make a corn meal trap. Put a spoonful or two of corn flour in the jar, and then put the jar where the slugs are active. Slugs are attracted by smells, but corn flour is too rough and will kill slugs. Leave the jar outside overnight or for a few hours. When you find slugs in the jar, you can discard them permanently and move them out of the garden.
2. Try to make a beer trap. Although this method sounds strange, beer is very attractive to slugs, even if only low-quality beer is used. Dig a hole in the ground and put a big cup or bowl in the hole. Use bevel gear, so that the slug can't climb out after drinking. Fill the beer to three-quarters of the bowl and let it stand overnight. The next morning, the bowl should be full of drowned slugs, so that you can dump it and let the birds eat it. Repeat this process until you remove most of the slugs.
Step 3 use a fruit trap. Slugs are naturally attracted to fruits and plants in the garden, so you can catch them with this. Put a board near the plants that slugs eat, and then put half an orange or a few pieces of cabbage (slug's favorite) in the center of the board. Leave the board outside for the night, and the slug should have covered the board with a small amount of food the next morning. Just throw them in the trash can, or kill them in other ways and put the traps back in the garden.