Bee kill-off at an Oregon shopping center was caused by a pesticide for aphids. The kill-off involved some 25,000 bumble bees.
Red Huber/Orlando Sentinel/AP/File
Oregon officials say a pesticide is to blame for the deaths of an estimated 25,000 bumble bees in a shopping center parking lot.
The state Department of Agriculture said Friday that tests on bees and foliage showed the deaths are "directly related to a pesticide application on linden trees" that was meant to control aphids.
It said an investigation is underway to see if the application of the pesticide Safari, done last Saturday, violated the law.
State officials are working with the Xerces (ZERK'-zees) Society for Invertebrate Conservation, the city of Wilsonville and the distributor of the pesticide.