. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 368 FUNGOUS DISEASES OF PLANTS. The mycelia of both the blotch and the speck are superficial, at most merely roughening the surface of the cuticle. The blotches are irregular in outline, sometimes coalescing into large areas. The specks, as the name indicates, are small, circular, dark col- ored flecks associ- ated in groups, and sometimes distrib- uted over large areas. A network of ra- diating olive-brown or fuliginous hyphae made up of more or less barrel-shaped cells constitute
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 368 FUNGOUS DISEASES OF PLANTS. The mycelia of both the blotch and the speck are superficial, at most merely roughening the surface of the cuticle. The blotches are irregular in outline, sometimes coalescing into large areas. The specks, as the name indicates, are small, circular, dark col- ored flecks associ- ated in groups, and sometimes distrib- uted over large areas. A network of ra- diating olive-brown or fuliginous hyphae made up of more or less barrel-shaped cells constitute the blotch. Cell fusions and cell aggregations are common. On the other hand, the specks are at first dense aggregates of rather light colored hy- phae, and from such specks delicate hyphas may be traced to similar neighbor- ing spots or to blotches. A mature speck becomes shining black and dry. Then the central portion breaks away and is pre- sumably the source of new infections. No spore form has been found accom- panying this phase. Both types of fungus have, FlG' l88' J-eptothyrwm Pom;: Develop- J r ° ' MENT OF PYCNIDIA FROM PYCNOSCLEROTIA however, been followed (Photograph by B. F. Floyd) Fig. 187. Fly Speck and Sooty Blotch of Apple. 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
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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
