Answer: You can invert a clear bowl or mason jar over each of the holes in the ground to trap the wasps in their nesting areas. Do this at dusk, when all the wasps are at home. In the morning they'll try to leave the nest and will become trapped. They aren't smart enough to dig an escape hole, so they'll stay in the ground and eventually starve to death. Remove the jars after a week of inactivity in the nest, and cover the holes up with soil. Ground nesting wasps are beneficial insects in that they help pollinate flowers and prey on other insects - but if their nests are ill-placed and you're concerned about the health of your grandchildren, you're probably justified in exterminating them. Cherry trees are famous for oozing sap. You can place a cardboard collar around the trunk of the tree and spray it with the sticky substance called 'Tanglefoot'. Insects that crawl onto it will become hopelessly stuck. Be sure to remove and replace the trap as it becomes filled with ants or other ants will crawl across the bodies, just as if they were a bridge.
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