. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 204 FUNGOUS DISEASES OF PLANTS. Fig. 77 b. Alfalfa defoliated by the Leaf Spot Fungus. (Photo- graph by H. H. Whetzel) Small sooty brown or black spots about -X- inch in diameter are 1 D produced, first evident on the upper surfaces of the leaves (Fig. 78). In these spots there appear later in the season the relatively simple, sessile apothecia, which are formed beneath the epidermis and break through at maturity. The spots are often very numer- ous, causing defoliation of many of
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 204 FUNGOUS DISEASES OF PLANTS. Fig. 77 b. Alfalfa defoliated by the Leaf Spot Fungus. (Photo- graph by H. H. Whetzel) Small sooty brown or black spots about -X- inch in diameter are 1 D produced, first evident on the upper surfaces of the leaves (Fig. 78). In these spots there appear later in the season the relatively simple, sessile apothecia, which are formed beneath the epidermis and break through at maturity. The spots are often very numer- ous, causing defoliation of many of the leaves by the latter part of summer. These structures are saucer-shaped, flat, and light in color, at first fleshy in texture. The club-shaped asci bear eight unicellular colorless spores in two series, measuring 10-14/i in length. Paraphyses are also pres- ent. The mycelium is very local and confined to the area of the spots. This fungus is very closely related to the species causing a leaf spot of clover, Pseudopeziza Trifolii, and with this species it may be identical. No practical method of controlling this dis- ease has been developed. XIV. ANTHRACNOSE OF CURRANTS Pseudopeziza Ribis Kleb. Dudley, W. R. Anthracnose of Currants. Cornell Agl. Exp. Sta. Built. 15: 196-198. 1889. Klebahn, H. Untersuchungen iiber einige Fungi imperfecti und die zuge- horigen Ascomycetemforem. Ill Gloeosporium Ribis (Lib.) Mont, and Desm. Zeitsch. f. Pflanzenkr. 16 : 65-83. pis. 3-4. 1906. Stewart, F. C. An Epidemic of Currant Anthracnose. N. Y. (Geneva) Agl. Exp. Sta. Built. 199: 64-80. 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
Size: 1034px × 2417px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
