Vine mildew

(Bot.) a fungous growth which forms a white, delicate, cottony layer upon the leaves, young shoots, and fruit of the vine, causing brown spots upon the green parts, and finally a hardening and destruction of the vitality of the surface. The plant has been called Oidium Tuckeri, but is now thought to be the conidia-producing stage of an Erysiphe.

See also: Vine

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.