Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 450 DISEASES OF ECONOMIC PLANTS upon the Pacific coast, where it often causes a loss of 50 per cent of the crop. It may be recognized as black cankered spots upon the young nuts, Avhich fall prematurely, or by sunilar spots upon the young green shoots. In seasons favorable to blight much of the terminal growth is killed and the succeeding crop is thereby reduced. Fig. 196. — Bacterial blight of walnuts. After R. E. Smith. Two treatments with Bordeaux mixture, after thorough removal of diseased
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 450 DISEASES OF ECONOMIC PLANTS upon the Pacific coast, where it often causes a loss of 50 per cent of the crop. It may be recognized as black cankered spots upon the young nuts, Avhich fall prematurely, or by sunilar spots upon the young green shoots. In seasons favorable to blight much of the terminal growth is killed and the succeeding crop is thereby reduced. Fig. 196. — Bacterial blight of walnuts. After R. E. Smith. Two treatments with Bordeaux mixture, after thorough removal of diseased parts, have been known to prevent 50 per cent of the loss. The second spraying should be given when the nuts are firmly set. Care should be taken to select resistant trees for propagation. WILLOW Tar spot (Rhytismose). See maple. Rust {Melampsora saliciscaprm (Pers.) Wint.). — Of tree rusts this is one of the most abundant, occurring as > Dept. Agr. Yearbook, p. 98, 1904.
Size: 1858px × 1076px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
