Infestations of this generally common species occur on narcissus and onion bulbs; roots of various other crops, including cabbage, carrot, parsnip and potato, are also attacked. The larvae feed gregariously and break down the invaded tissue into a wet, greyish or blackish mass. The pest is usually of secondary importance and typically invades unhealthy or previously damaged plant material.
Adult flies occur in the early spring and are attracted to rotting vegetative tissue. Eggs are then laid, in batches, in suitable situations. The larvae feed gregariously, hollowing out bulbs, tubers
Fig. 250 Puparium of a small narcissus fly, Eumerus strigatus (x7).
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