Agrobase Canada
Grey mold (botrytis rot, botrytis vine rot, botrytis fruit rot)
Botrytis cinerea

The fungus belongs to the Sclerotiniaceae within the Ascomycetes. The anamorph stage Botrytis cinerea has a worldwide distribution. However, it is not clear how widespread and frequent the teleomorph B. fuckeliana is. It is concluded that sexual reproduction might be an important source of genetic variation.
The fungus grows well on artificial media. The anatomy and morphology of the mycelium of B. fuckeliana are typical of the Ascomycota. Septa are present and are perforated by a simple pore. The mycelium is composed of brownish olive hyphae. Anastomoses between hyphae are often noted. Conidiophores are frequently 2 mm or more long, mostly 16-30 µm wide with often a swollen basal cell. The conidia are ellipsoidal or ovoid, generally with a slightly protuberant hilum. They are dry and hydrophobic, colorless to pale brown, smooth, 6-18 x 4-11 µm (mostly 8-14 x 6-9 µm). In mass the conidia are grey-brown.
Grey mold is a blight or rot of immature, fleshy or senescent tissues. Lesions develop as tan or brown, water-soaked areas, which may become greyish or dried out. The profuse grey-brown sporulation of the fungus on old diseased tissue is characteristic. Buds and young shoots of grapevine may be infected, turn brown, and dry out. On a few leaves reddish brown, necrotic lesions appear on the vines. Before capfall, the fungus may invade inflorescences, which rot and fall off. From these sites it attacks the pedicel or the rachis. From ripening onward, the grapes are infected, especially through wounds. The mold progressively invades the entire cluster. Infected white grapes turn brown, and black grapes become reddish.

Effective on
Allegro 500F
Efficiency: ★★★
Astound
Efficiency: ★★★
Bravo 500
Efficiency: ★★★
Bravo 720
Efficiency: ★★★
Bravo Top
Efficiency: ★★★
Bravo Ultrex
Efficiency: ★★★
Bravo ZN
Efficiency: ★★★
Captan 4 Flowable
Efficiency: ★★★
Captan 48 SC
Efficiency: ★★★
Captan 50-WP Wettable Powder
Efficiency: ★★★
Captan 80-WP Wettable Powder
Efficiency: ★★★
Cyproflu
Efficiency: ★★★
Decree 50 WDG
Efficiency: ★★★
Delaro 325 SC
Efficiency: ★★★
Elevate 50 WDG
Efficiency: ★★★
Fracture
Efficiency: ★★★
Heritage Maxx
Efficiency: ★★★
Inspire Super
Efficiency: ★★★
Lance WDG
Efficiency: ★★★
Luna Privilege
Efficiency: ★★★
Luna Privilege Greenhouse
Efficiency: ★★★
Luna Tranquility
Efficiency: ★★★
Mertect SC
Efficiency: ★★★
Ridomil Gold 480SL
Efficiency: ★★★
Ridomil Gold Bravo Twin Pack
Efficiency: ★★★
Ridomil Gold SL/Bravo ZN Twin-Pak
Efficiency: ★★★
Rovral WDG
Efficiency: ★★★
Rovral WP
Efficiency: ★★★
Scala SC
Efficiency: ★★★
Scala SC Greenhouse
Efficiency: ★★★
Scholar 230SC
Efficiency: ★★★
Scholar 50WP
Efficiency: ★★★
Serenade ASO
Efficiency: ★★★
Serenade OPTI
Efficiency: ★★★
Switch 62.5 WG
Efficiency: ★★★
Tanos 50 DF
Efficiency: ★★★
USF0728 325 SC
Efficiency: ★★★
Vangard 75WG
Efficiency: ★★★
Vangard 75WP
Efficiency: ★★★
Vertisan
Efficiency: ★★★
Sercadis
Efficiency: ★
Serenade MAX
Efficiency: ★
Xemium SC Foliar
Efficiency: ★
Captan 50 W
Efficiency: not_available
Captan 80 WGD
Efficiency: not_available
Echo 720
Efficiency: not_available
Echo 90 DF
Efficiency: not_available
Folpan 50 WP Folpet
Efficiency: not_available
Folpan 80 WDG
Efficiency: not_available
Fontelis
Efficiency: not_available
Headline Duo One
Efficiency: not_available
Headline Duo Two
Efficiency: not_available
Intuity
Efficiency: not_available
Pristine WG
Efficiency: not_available
Ridomil Gold 480EC
Efficiency: not_available