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Quinoa downy mildew

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Quinoa downy mildew

Fungus

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 : Downy mildew and late blight (oomycetes) (Damage and symptoms on the host)

Scientific name : Peronospora variabilis

Other names : Peronospora variabilis

Oomycete causing the main disease of quinoa in the Andes (Ecuador, Bolivia, Peru, Chile, Colombia), also reported in North America, Europe and Asia. Chlorotic or pinkish spots that turn necrotic appear on the upper leaf surface, with a greyish-brown growth underneath; heavily affected leaves drop. It thrives above 80% humidity in cool weather and is carried by seed and crop debris.

Crops affected : Quinoa

Source : Peronospora variabilis — Bugwood Wiki — Bugwood Wiki

This page lists the bio-preparations in the collection that other references associate with this opportunist: Quinoa downy mildew.

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

Quinoa

Opportunists of the same crops

Sclerotinia rot Fall armyworm Quinoa moth

← Referenced opportunists

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