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Sunflower downy mildew

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Sunflower 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 : Plasmopara halstedii

Other names : Downy mildew of sunflower

Soil-borne oomycete that infects sunflower seedlings during germination when the soil is waterlogged. Infected plants remain dwarfed, with yellowish leaves and white down underneath, and the head stays upright and almost sterile. Its oospores survive many years in soil; many races exist.

Crops affected : Sunflower

Source : Plasmopara halstedii (PLASHA)[Overview] — EPPO Global Database — EPPO

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

Sunflower

Opportunists of the same crops

Rust European corn borer Verticillium wilt Sclerotinia rot Stolbur (bois noir) Xylella fastidiosa Cotton bollworm (Helicoverpa) Tomato spotted wilt virus Pink hibiscus mealybug Brown marmorated stink bug

← Referenced opportunists

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