. Diseases of economic plants. Plant diseases. Cereals 309 from 4 to 32 per cent of the plants. The same investigator found that the yield in juice was lessened about 30 per cent, owing to the smaller size of the smutted plants. The damage is particularly serious in kafir and broom corn. See p. 283. These smuts gain entrance to the host only during the very young seedling state, before the plants appear above ground. The mycelium of the causal fungus grows through the plant until flowering time without any indication of its presence. At blossoming time the fungus seeks the ovary, destroys it,
. Diseases of economic plants. Plant diseases. Cereals 309 from 4 to 32 per cent of the plants. The same investigator found that the yield in juice was lessened about 30 per cent, owing to the smaller size of the smutted plants. The damage is particularly serious in kafir and broom corn. See p. 283. These smuts gain entrance to the host only during the very young seedling state, before the plants appear above ground. The mycelium of the causal fungus grows through the plant until flowering time without any indication of its presence. At blossoming time the fungus seeks the ovary, destroys it, and becomes evident as smut. Disinfection of the seed by formalin is an efficient remedy. Head-smut ^^^ (Sphacelotheca reiliana (Kuehn) Clinton). — Instead of involv- ing the grains singly, as in the kernel-smut, the head as a whole is affected. A white membrane is at first present, but this later breaks open, exposing the pulverulent spore mass. Rarely, only a portion of the head is smutted. The spores soon weather away, leaving behind only the veins of the part involved. This disease was first noted in Egypt in 1868, and is preva- lent in America only in the Texas Panhandle. It occurs on sorghum and to some extent on corn. Milo is immune. The only procedure to recommend is that employed for corn smut. Anthracnose (Colletotrichum falcatum Went.). — Anthrac- nose was first seen in America upon sorghum in North Carolina, where it did considerable damage. It has since been reported from Louisiana. The spots which are more prevalent on the lower leaves have very definite gray or tan- colored centers which are surrounded by dark, reddish-. FiG. 164. — Three views ot sorghum kernel- 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- [from old catalog]; Hall, John Galentine,
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
