. Fungous diseases of plants, with chapters on physiology, culture methods and technique . n. Mycology 6: 173-178. pis. iy-i8. , G. F. Some Diseases of Cotton. Ala. Agl. Exp. Sta. Built. 41: 40-49. Jigs. g-13. , E. A. Anthracnose of Cotton. Journ. Mycology 6: 100-105. pi. 4. Jigs. 1-8. 1890. Habitat relations. Anthracnose of cotton exists as a malady ofsome importance upon rich land in some of the cotton-growing,particularly theGulf, states. Itwould seem thatthe fungus is widelydistributed, butserious injury isdoubtless depend-ent upon local con-ditions. The lesions
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . n. Mycology 6: 173-178. pis. iy-i8. , G. F. Some Diseases of Cotton. Ala. Agl. Exp. Sta. Built. 41: 40-49. Jigs. g-13. , E. A. Anthracnose of Cotton. Journ. Mycology 6: 100-105. pi. 4. Jigs. 1-8. 1890. Habitat relations. Anthracnose of cotton exists as a malady ofsome importance upon rich land in some of the cotton-growing,particularly theGulf, states. Itwould seem thatthe fungus is widelydistributed, butserious injury isdoubtless depend-ent upon local con-ditions. The lesions ofthis fungus aremore importantwhen bolls andseedlings are in-fested, but injuriesto stems and leavesare not the bolls theminute reddishspot at first evi-dent about an infec-tion center rapidlyincreases in size, the injured area, „ , ,. . ? Fig. 157. Anthracnose of Cotton. (After Geo. r. marked by a red- Atkinson) dish border, becom-ing black and slightly depressed. Many spots may become conflu-ent, so that very irregular outlines may result. As the development. 326 FUNGOUS DISEASES OF PLANTS of conidia proceeds, in the older areas the spots vary from gray tobright pink. Through such injuries the boll is usually seriouslydamaged and may never open. Moreover, through the boll injuriesthe fungus may probably penetrate the seed and thus be carried overand distributed the following season. Seedlings may be affectedeither upon cotyledons or stem, especially upon employing diseasedseed, and at this stage the plantlet is readily wilted as a result. Upon stems of the adult plant the CoUetotrichum seems to belargely a wound parasite, although in continued moist weatherdirect injury may be induced. Upon mature leaves it is said totake the form of a scald, or frost effect, and it may also accompanyother leaf diseases. Characters of the fungus. From a loose stroma within the tis-sues conidiophores of two types break through the epidermis andproduce conidia abundantly
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