. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 146. Cercospora Gossypina: an Isolation Culture XX. CERCOSPORA: OTHER SPECIES Parallel cultures on diverse culture media of a number of species on related hosts would be of special interest. As in the case of Phyllosticta, subse- quently discussed, numerous leaf spots are produced by members of this genus Cerco- spora. Very few cross inocula- tions have been made, and little is really known concerning the limitations of species. When the host plants are different, minor variat
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 146. Cercospora Gossypina: an Isolation Culture XX. CERCOSPORA: OTHER SPECIES Parallel cultures on diverse culture media of a number of species on related hosts would be of special interest. As in the case of Phyllosticta, subse- quently discussed, numerous leaf spots are produced by members of this genus Cerco- spora. Very few cross inocula- tions have been made, and little is really known concerning the limitations of species. When the host plants are different, minor variations in the size, color, septation, etc., of spores and conidiophores, or in the macroscopic appearances of spots, are generally employed in distinguishing species. Among many other species the following upon important hosts may be mentioned. Cercospora Viticola Sacc. This fungus produces a spot known as grape leaf blight. It has not been productive of serious damage except during unusually moist seasons. The spots are first evident on the lower surface of the leaf, and it is also upon this surface that the conidiophores are developed. Upon Am- pelopsis quinquefolia a Cercospora is more commonly found, but apparently no com- parative study of these different forms has been made. Cercospora circumscissa Sacc. is one of the shot-hole-producing leaf fungi of the genus Prunus. It occurs on some of the native American as well as cultivated species of plums and cherries (Fig. 147) and on the nec- tarine and peach. It is, however, not so important from a patho- logical point of view upon most of these hosts as Cylindrosporium. Fig. 147. Cercospora circumscissa: Spots on Almond. (After Pierce). 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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