noun
lesion spot; disease spot
Technical term in plant pathology and agriculture for a localized discolored or damaged area on a plant caused by disease or pests.
この葉の病斑から病原菌が広がった。
The pathogen spread from the lesion spots on this leaf.
病斑の形状で病気の種類を特定できる。
The type of disease can be identified by the shape of the lesion spots.