Make sure to clean up any debris, such as wilted leaves or plant material, around your raised beds. Earwigs thrive in cool, damp environments, so removing potential hiding spots is key.
Use organic matter like compost or chipped bark as mulch; however, avoid overly thick layers that can retain moisture. Instead, ensure that mulch does not create a damp habitat that attracts earwigs.
Implement a trapping program by placing shallow containers, such as tuna cans filled with vegetable oil, around your raised beds. This will help catch earwigs, as they are attracted to the oil . Alternatively, rolled-up newspapers, bamboo tubes, or cardboard can serve as hiding spots for earwigs, and you can check these traps regularly to dispose of the captured insects.
Regularly remove boards and other materials that may provide shelter. Raising pots and containers off the ground can also discourage earwigs from settling in.
Consider using diatomaceous earth around the base of your raised beds as a barrier against earwigs. This method can deter them without the need for chemical treatments.
Since earwigs can help aerate soil by breaking down organic matter, it may not be necessary to replace the soil. Keeping your soil healthy with regular aeration and organic amendments can also minimize earwig problems. See also:
https://extension.umn.edu/nuisance-insects/earwigs#:~:text=Using%20pesticides%20in%20the%20garden&text=Treat%20the%20surrounding%20mulch%20where,the%20plants%20you%20are%20protecting.
https://extension.colostate.edu/topic-areas/insects/european-earwigs-5-533/