new york state beekeeper jim doan saw it firsthand. >> i've worked in bees for now 46 years, and so i know what normal looks like, and what we've seen over the last 6 or 7 years is not normal. >> honeybee loss has consequences for the economy. one-third of food produced in the u.s. depends on honeybee pollination. >> we are putting at risk several hundred billion dollars of product every year. it is significant because the crops that are pollinated are some of them that really add diversity and vitality to our diet. >> honeybee losses have been linked to multiple factors, like pesticides, habitat degradation, malnutrition, pathogens, and varroa mite infestations. 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 parasitizes young and adult 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