. Diseases of economic plants. Plant diseases. VEGETABLE AND FIELD CROPS 227 angular in outline, owing to their limitation by the veins. They seldom exceed 3-6 mm. in diameter unless by the coalescence of several spots. The spots soon become brown, and the central part turns ashen-white and is seen by the. Fig. 107. — Cercosporose of celery. Original. aid of a hand lens to bear numerous hyphse. The leaves may bear so many spots as to appear as though scorched, and often death results to the entire plant. The disease spreads most rapidly in damp warm weather. Marked difference in varietal resis
. Diseases of economic plants. Plant diseases. VEGETABLE AND FIELD CROPS 227 angular in outline, owing to their limitation by the veins. They seldom exceed 3-6 mm. in diameter unless by the coalescence of several spots. The spots soon become brown, and the central part turns ashen-white and is seen by the. Fig. 107. — Cercosporose of celery. Original. aid of a hand lens to bear numerous hyphse. The leaves may bear so many spots as to appear as though scorched, and often death results to the entire plant. The disease spreads most rapidly in damp warm weather. Marked difference in varietal resistance was reported by Tracy1 as early as 1885, the Boston Market and Golden iSee Lamson-Scribner, F., Dept. Agr. Rpt. for 1886, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870- joint author. New York, The Macmillan Company
Size: 1550px × 1612px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
