Narcissus bulb fly, or, Merodon equestris, is a bee-mimicking hoverfly whose larvae feed on plant bulbs, more specifically, the bulbs of plants belonging to the Narcissus genus. These flies are frequently sighted in the garden as well as in flowery suburban habitats. There are also variants within the species, where each mimics a different species of bumblebee. Mimicry in nature is an evolutionary adaptation that's used as a form of defence. In other words, these flies trick other wildlife into thinking they have a nasty sting, so predators tend to keep their distance.
Hoverflies are considered as the next best pollinators following the bees.
Larvae will eat the bulbs of daffodils.
Like a bee! These flies have evolved over the years to (almost) perfectly replicate a bumblebee. They are large, reaching 1.5cm. They are fluffy, like bees- and this makes them great for pollinating flowers. They possess some banding, which starts with orange fur, leading to a black thorax, with their rears brownish-yellow. Only one larva will infect a bulb. They look like plump, creamy-white grubs. They are nearly 2cm long.
Infested bulbs are often killed. Infested bulbs do not tend to produce flowers. Leaves which do grow can be stunted and yellow. Damage is not normally recognised until it's too late.
This fly is widespread across Europe. They were recently introduced to America. They're present in some parts of Asia.
These flies dislike shade, so they can be avoided by planting daffodils and other bulbous plants near cover. Firm down the spoil once bulbs have been planted. This will make it harder for females to deposit eggs. Be sure to buy good quality bulbs and inspect them carefully before planting in the garden.
There are currently no appropriate forms of chemical control available for home gardeners.