t the safety oneonics,aying at even low velslsf exposure can affect the ability hononeybees to comommunicate and c can supps ththeir immune system, making tm momore susceptibible to virusesd varroaoa mites. >> the effects of these pestiticides on thehe bees is manyfold. it affects reproduction. the navigational ability of the bees is impaired. they can't find their way home. if they can't finththeir wa home, they can't bri resesources back k to the hiveve, the hive s depleted of woworker bees andd forarager bees, , and the hive t crashes after that. >> and it's not only honeybees that are affected. >> we're seeing broad-scale decline in really important pollllinators, l like our bumblebees. perhaps 30% of our bumblebees arere in declinine, a quarter of them at risk of extinction in the near future. >> david goulson, a scieientist based in the united kingdom, looked into how neonicotinoids affect bumblebees. >> we wanted to know what would happen to a bumblebee nest that was next to a field of a flowering crop like canola that had been treated as a seed dressing with a neonicotinoid. so we si