. >> mt expertagree that the single greatest threat to honeee healtis the vroa mi, an invive bloosucking pet that bh direct pasitizesyoung d adult be and vectors bee diseases. where varroa mites are absent or well controlled, honeybeesre thrivi. >> 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 ide and comi on the scene in the 1990s. it is the fastest-growing group of insecticides in the united states. >> for the companies that make them, neonicotinoids, or neonics, are big business. they bring in over $2.6 billion a year in global sales. they are widely used as seed treatments, applied as soil drench, or sprayed onto foliage. in the u.s., they are used on some 200 million acres of cropland, on almost all cn, canola, and half of all soybean crops, as well as many fruits and vegetables. >> they are used in home and garden products, often at concentrations that are far higher than those you will find in the agricultural sector. >> millions of po