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Lettuce downy mildew

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Lettuce 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 : Bremia lactucae

Other names : Downy mildew of lettuce

Oomycete of lettuce and other Asteraceae, found worldwide. Pale green to yellow angular patches appear on the upper leaf surface and white down underneath; outer leaves turn brown, lowering the value of the lettuce. Many races exist that overcome varietal resistance, and it thrives with cool, humid nights.

Crops affected : Lettuce

Source : Bremia lactucae (BREMLA)[Overview] — EPPO Global Database — EPPO

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

Associated bio-preparations

Grape seed extract solution

✅ Authorised EU Bio-inputs in the European UnionBio-inputs in BurundiBio-inputs in ColombiaBio-inputs in Costa RicaBio-inputs in IndonesiaBio-inputs in IndiaBio-inputs in KenyaBio-inputs in South KoreaBio-inputs in MoroccoBio-inputs in PeruBio-inputs in the PhilippinesBio-inputs in RwandaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

See also

Crops

Lettuce

Ingredients used

Water Grape Seed Extract

Opportunists of the same crops

Aphid Downy mildew Caterpillars / worms Botrytis (grey mould) Slugs and snails Verticillium wilt Sclerotinia rot Root-knot nematodes Cucumber mosaic virus Stolbur (bois noir) Aster yellows Tomato spotted wilt virus

← Referenced opportunists

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