Be aware that the use of pesticides on trees, shrubs and other plants in bloom can be deadly to bees.

Eugene incident appears to be an application of imidacloprid to linden trees.
Gail Langellotto, Ph.D., Statewide Coordinator, Oregon State... See More

OSU Master Gardener(TM)  osumg.blogspot.com

OSU Master Gardener volunteers utilize objective, research-based information to diagnose plant problems and offer sustainable solutions. This blog will highlight scientific studies that may be of interest to OSU Master Gardeners (and others) who would like to know more...