bulb fly

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bulb fly

n
(Animals) a hoverfly, the larvae of which live in bulbs and can become serious pests, esp the yellow and black narcissus bulb fly (Meridon equestris)
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The research led by Durham will investigate how wheat plants defend themselves from attacks by wheat bulb flies and cereal aphids, and how the insects can counter the plant's defences.
If your bulbs have spindly leaves or are blind, they may have an infestation of bulb flies.