Pollen beetles are about 2-3mm long and are black or greenish bronze with clubbed antennae. They crawl around in flowers as they feed on the pollen. Common species are Meligethes aeneus and M. viridescens, both of which breed in the flowers buds of brassica seed crops, including oilseed rape. Heavy infestations of pollen beetles are more likely to occur in rural areas in the vicinity of oil-seed rape crops.
None of the 36 species of pollen beetle in Britain cause damage to garden plants. They all develop in the flower buds of wild flowers or agricultural crops. The adult beetles are much less fussy about the flowers they visit and they eat the pollen of a wide range of plants. Yellow flowers seem to be particularly attractive. Pollen beetles are not directly harmful to the blooms and they may assist with pollination. The beetles can be a nuisance on flowers that are being cut for use in the house. Once indoors, the beetles start wandering around and head towards windows.