beekeepers are finding the frames are empty, even when the weather is good and plenty of food is on hand. scientists believe it could be the result of a natural phenomenon or poor nutrition or pesticides. but when they try to figure out what's going on, farmers and bee keepers are growing increasingly nervous. while their hives look healthy, they can't be certain their bees won't suddenly fly off and die. they put the roafl these tiny poll d they put the role of these tiny mol nateors into purchase prospective. >> if you don't get them visits you are not going to get that watermelon. >> reporter: bee keepers are doing a great job of rebuilding their colonies. there have been enough bees