About a year retin-a price uk âHoneybee pollination can significantly increase the yield of crops and they are vital to the worldâs economy – £430 million a year to the UK alone,” ecology professor Guy Poppy said. “However to forage effectively they need to be able to learn and recognise the plants. The results indicate that NOx gases – particularly nitrogen dioxide – may be capable of disrupting the odour recognition process that honeybees rely on for locating floral food resources.â