ADVANCE FOR THE WEEKEND OF SEPT 24-25 AND THEREAFTER - In this Tuesday, Sept. 6, 2016 photo, Bill Johnson checks a board for honey at Johnson Honey Farm in Guttenberg, Iowa. Beekeeping has changed significantly in the nearly 30 years Bill Johnson has had his hives. Johnson said his bees require a very close eye on their health, due in large part to the types of chemicals they are exposed to on plants. (Jessica Reilly/Telegraph Herald via AP)