White leaf spot

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White leaf spot
Bean White Leaf Spot Pseudocercosporella albida.jpg
White leaf spot (P. albida) on a bean leaf
Scientific Classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Dothideomycetes
Subclass: Dothideomycetidae
Order: Capnodiales
Family: Mycosphaerellaceae
Genus: Pseudocercosporella
Species: P. albida and P. capsellae

White leaf spot (Pseudocercosporella spp) is a minor foliar disease of brassicas (P. capsellae) and legumes (P. albida). The most susceptible varieties are chinese cabbage, swede and turnip with fewer reports of infection in Brassica oleracea species (broccoli, cabbage, cauliflower etc.[1]

Symptoms[edit]

Brassicas[edit]

The primary symptoms are leaf spots that begin small, 2-3mm, grey-green in colour and circular. As the condition develops these lesions will expand up to 10-12mm, turn light tan to white and remain circular. Dark streaks and speckling are sometimes visible within the leaf spots.[1]

Treatment[edit]

Control methods are rarely needed. Plow in infected crop residues after harvest.[1]

Prevention[edit]

Do not plant susceptible crops in infected sites for at least 1 year.

Gallery[edit]

References[edit]

  1. a b c Koike, S.T.; Gladders, P.; Paulus A.O. (2006). Vegetable diseases - A colour handbook. Academic Press. Burlington, MA. ISBN: 10:0-12-373675-7.