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Powdery mildew

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Powdery 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 : Powdery mildew (fungi) (Damage and symptoms on the host)

Scientific name : Erysiphaceae

Other names : white mould

Powdery mildew is a group of fungi in the family Erysiphaceae that grow on the surface of leaves, shoots and fruit, forming a white to greyish powdery coating. Unlike many fungi, it thrives in warm, dry weather with humid nights, and its spores are spread by wind. Affected leaves become distorted, turn yellow and dry out; it is common on grapevine, cucurbits, pome fruit, strawberry and rose.

Crops affected : Apple tree, Cucumber, Grapevine (4 varieties), Melon, Nursery roses and shrubs, Pea, Squash / Pumpkin, Strawberry, Tomato, Wheat, Zucchini

Source : Powdery Mildew on Fruits and Berries / Home and Landscape / UC Statewi — University of California, UC IPM

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

Diluted milk whey (whey)

✅ Authorised EU Bio-inputs in the European UnionBio-inputs in BurundiBio-inputs in ColombiaBio-inputs in KenyaBio-inputs in PeruBio-inputs in RwandaBio-inputs in TunisiaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

Sodium bicarbonate 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 JapanBio-inputs in KenyaBio-inputs in South KoreaBio-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

Willow Bark (Salix spp.) Infusion

✅ 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

Sunflower oil dispersed in water

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

Neem leaf brew

✅ Authorised in some countries Bio-inputs in BurundiBio-inputs in ColombiaBio-inputs in Costa RicaBio-inputs in IndiaBio-inputs in KenyaBio-inputs in South KoreaBio-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

Horsetail (Equisetum arvense) Decoction

✅ 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

Diluted cow's milk

✅ Authorised EU Bio-inputs in the European UnionBio-inputs in BurundiBio-inputs in KenyaBio-inputs in PeruBio-inputs in the PhilippinesBio-inputs in RwandaBio-inputs in TunisiaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

Salt solution (sodium chloride) for vineyards

✅ Authorised EU Bio-inputs in the European UnionBio-inputs in BurundiBio-inputs in KenyaBio-inputs in RwandaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

See also · Crops

Pea Cabernet Sauvignon Zucchini Squash / Pumpkin Chardonnay Strawberry Apple tree Melon Merlot Cucumber Nursery roses and shrubs Tempranillo Tomato Wheat

Ingredients used

Water Sunflower oil Baking soda (sodium bicarbonate) [NaHCO3] Sodium chloride (salt) [NaCl] Horsetail (Equisetum arvense) Willow bark (Salix spp.) Fresh neem leaves Milk Whey

Opportunists of the same crops

Stolbur (bois noir) Pink hibiscus mealybug Brown marmorated stink bug Tomato spotted wilt virus Spider mite Chilli thrips Botrytis (grey mould) Mites Downy mildew Xylella fastidiosa False codling moth Cotton bollworm (Helicoverpa)

← Referenced opportunists

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