Narcissus bulb fly
Larva — Diptera
Identification key : 
Maggot (fly larva) (Larva) 
Flies (brachyceran Diptera) (Adult (and nymphs resembling the adult))
Scientific name : Merodon equestris
Other names : Large narcissus fly
Hairy hoverfly 11 to 13 mm long that mimics a bumblebee. The female lays near the neck of narcissus bulbs and other Amaryllidaceae and Liliaceae; the larva enters the bulb and eats out the inside over summer and winter, so the plant fails to grow or produces only a few thin leaves. A single larva usually destroys a bulb.
Crops affected : Bulbs and seasonal plants
Source : Merodon equestris (LAMTEQ)[Overview] — EPPO Global Database — EPPO
This page lists the bio-preparations in the collection that other references associate with this opportunist: Narcissus bulb fly.
Warning: the associations between recipes and opportunists come from other references (traditional practices, publications, user feedback). They are neither a recommendation nor a claim of effectiveness. There is no certainty regarding the preparation, application and use of these bio-preparations. See the regulations
No published recipe is associated with this opportunist yet.