As we move into autumn, the population of earwigs in the garden can boom, but because they are nocturnal creatures, often the first sign that you have a problem are holes appearing in dahlias and chrysanthemums as well as fruits such as apples. They will often fall out of cut flowers brought indoors.
An easy old- fashioned but effective method is to fill a small pot with damp straw and place this upside down on a bamboo cane near the plants likely to be attacked by earwigs. Overnight, earwigs will crawl in to hide during the day. The next morning, you can dispose of them. It is worth noting that as well as eating holes in dahlias, earwigs will also eat greenfly and other small pests.
To protect her fruit trees, I can remember my grandmother rolling funnels of corrugated paper and putting them into the trees. As with the pots of straw, it provided the earwigs with a place to hide from which they could be easily removed before doing damage.