The last three are actual destruction of desirable property. However, relief from both types of problems can be accomplished by only one method - nest destruction. Before anyone tries to control a European hornet problem, they would be wise to stop, think and plan very carefully. Remember, you may be encountering a nest of 400 hornets that can sting repeatedly, will fly at night, have guards at the nest entrance, may have more than one entrance to the nest, and may have nested almost anywhere. If a nest is located, it can be treated with a pressurized wasp and hornet jet spray.
Several brands are available, but they all are about equal in effectiveness.
Although the knock-down is quick, it may not be quick enough if you are too near the nest or do not take other precautions. It is best to treat at night with the aid of a flashlight. Prop the light on something and aim it at the nest or nest opening. When you begin to spray, the wasps usually will attack the light rather than the source of the spray. Wear heavy clothing and a bee veil, if available, to protect yourself from any wasps that may not be fooled by the light.