Definition of American gooseberry mildew in English:

American gooseberry mildew

noun

Horticulture
  • A mildew, Sphaerotheca mors-uvae, which chiefly affects gooseberry and blackcurrant bushes, causing a white powdery coating on young shoots and a brown felty covering on fruit and leaves.

Origin

Late 19th century; earliest use found in George Massee (1850–1917).