. > honeyb loss ha nsequenc for theconomy. one-thirof food oduced i the.s. depes on honbee pollinaon. >> we are putting at risk several hundred billion dollars of proct everyear. it is significant because the crops that are pollinated are some of them that really add diversity and vitality to our diet. >> hneybee sses havbeen lied to muiple facrs, like sticideshabitat degradatn, malnuition, patgens, anvarroa me nfestatis. for pesticide manufacturer bayer crop science, the issue is clear. >> most experts agree that the single greatest threat to honeybee health is the varroa mite, an invasive blood-sucking pest that both directly parasiizes yog and adt bees and vectors bee diseases. where varroa mites are absent or well controlled, honeybees are thriving. >> but jim says he knows why his bees are dying. >> we had a multitude of neonics that were showing up in our bees. it doesn't take much to kill a bee. >> neonicotinoids are a relatively new class of insecticide and coming on the scene in the 1990s. it is the fastest-growing group of insecticides in the unite