A Grammatical Dictionary of Botanical Latin

Mildew, “1. a plant disease in which the pathogen is seen as a growth on the surface of the host; 2. the staining, and frequently the breaking up, of cloth and fibers, paint, etc., by fungi and bacteria; 3. a fungus taking part in 1. or 2.” (Ainsworth & Bisby); “1. a fungus, or 2. a disease of plants caused by a fungus, or 3. the appearance of a fungous growth upon organic or inorganic substrata, characterized in all cases by the cottony, superficial mycelium, usually white, but sometimes dark” (S&D): aurugo,-inis (s.f.III), abl. sg. aurugine: the jaundice (from its color); a sickly look, paleness; (of plants) mildew (from the yellowing of the leaves) [> L. aurum,-i (s.n.II), gold]; icterus,-i (s.m.II), q.v., abl.sg. ictero: jaundice, a yellowing of plant leaves caused by excessive cold or moisture; cf. = mold, moldiness; see mold.

Downy Mildew: “the appearance or the disease caused by a member of the Peronosporaceae, so-called because of the downy appearance provided by the multitude of conidiophores projecting through the stomates on the lower surfaces of leavesl ‘false mildew’” (S&D).

Powdery Mildew: “the appearance or the disease caused by a member of the Erysiphaceae, so called because of the appearance of the upper surface of affected leaves provided by the multitude of abjected conidia” (S&D).

Sooty Molds: “the ‘fumagines’ of French workers, by many (cf. Stevens, 1930) considered to refer only to the Capnodiaceae, saprotrophic forms growing and thriving in the honeydew excreted by aphids, so called because of the superficial layer or crust of black mycelium, spores, etc., on the surface of plant parts; by others considered to include also the parasitic, asterinoid forms, ‘black mildews,’ etc., the Meliolaceae, Englerulaceae and Hemisphaeriales, etc.” (S&D).

Botrytaceae: an order of Fungals usually known as mildews and blights. (Paxton). Erysiphe, DeCandolle. The name given to mildew by the Greeks. Helvellaceae Very minute, mostly whitish species, found most commonly in autumn, on a great variety of plants, shrubs, and trees (Paxton). Fungi. Extensive groups of singular plants, known as blights, blasts, mildews, and mushrooms. (Paxton). Uredo, Persoon. From uro, to scorch; applied to those plants called mildew or blight. Uredinacece. The species of this obscure genus are found on the leaves of different plants (Paxton).