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Walnut husk fly

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Walnut husk fly

Insect — Diptera

What is an opportunist?

An "opportunist" is a population (fungi, bacteria, insects…) that takes advantage of a favourable environment to settle in, multiply and feed on it. It often develops when the natural defences of the affected organism are weakened — for genetic reasons or linked to context (water stress, deficiencies, nutritional imbalances, overcrowding…). This is typically the case in monocultures, where a single host plant, uniform and present in large numbers, offers ideal ground for it to spread.

Identification key : Maggot (fly larva) (Larva) Flies (brachyceran Diptera) (Adult (and nymphs resembling the adult))

Scientific name : Rhagoletis completa

Other names : Walnut husk maggot

Banded-wing fruit fly native to North America and introduced to Europe in the 1980s. Larvae feed on the husk (the green outer covering of the walnut), which blackens and sticks to the shell; nuts are stained and hard to hull. There is one generation a year.

Crops affected : Walnut tree

Source : Rhagoletis completa (RHAGCO)[Overview] — EPPO Global Database — EPPO

This page lists the bio-preparations in the collection that other references associate with this opportunist: Walnut husk 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.

See also

Crops

Walnut tree

Opportunists of the same crops

San José scale Codling moth Phytophthora cinnamomi root rot Xylella fastidiosa Common cockchafer (white grub) Walnut blight Brown marmorated stink bug

← Referenced opportunists

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