Prior to the application of any pesticide labeled as toxic to bees, an applicator is required by rule (IAC 21-45.31(206)) to notify all owners of registered beeyards within a 2-mile radius of the site of application. Notification is required at least 24 hours and no more than 72 hours prior to the application. This notification enables beekeepers to move or otherwise protect the bees.
The "Environmental Hazards" section of a pesticide label identifies whether a pesticide is toxic to bees. Visit the Iowa Department of Agriculture and Land Stewardship's Web site  for the list of registered beeyards or contact Bob Cox, state apiarist, at 515-281-5736 with questions.
This article originally appeared on page 86 of the IC-484(11) -- May 29, 2000 issue.