How to Kill Yellow Jackets Without Chemicals

This month Jon came across a yellow jacket nest while mowing the lawn.  The nest is located about 3 feet from an apple tree so using chemicals or gasoline like many suggest, just wasn't an option.  Doing a quick Google search, we came across this idea: put a glass bowl over the hole so the yellow jackets can't escape.  The bowl lets light into the nest so they fight like mad to get out and tire themselves out without any access to food and water.  

We used two bowls to ensure that any yellow jackets that managed to sneak under the first bowl were caught in a second trap.  After four days we checked to see if there was activity and discovered the bowls off the hole and the nest dug out of the ground.  We're thinking a skunk found the nest and raided it since the yellow jackets were probably pretty weak at this point.  Problem is now solved!