. California plant diseases. Plant diseases. Bulletin 218] CALIFORNIA PLANT DISEASES. 1081 Stem Rot (Sclerotinia libertiana). The stems wilt and die after reaching nearly full size. Usually scat- tering stems here and there about the field are affected, and may be easily seen by their contrast with the thrifty, green appearance of the other stalks. This trouble usually occurs most abundantly where there is a thick stand of alfalfa, heavily shading the ground, particularly in the spring when the ground is very moist. On pulling an affected stem it is found to be decayed at the base, and usually
. California plant diseases. Plant diseases. Bulletin 218] CALIFORNIA PLANT DISEASES. 1081 Stem Rot (Sclerotinia libertiana). The stems wilt and die after reaching nearly full size. Usually scat- tering stems here and there about the field are affected, and may be easily seen by their contrast with the thrifty, green appearance of the other stalks. This trouble usually occurs most abundantly where there is a thick stand of alfalfa, heavily shading the ground, particularly in the spring when the ground is very moist. On pulling an affected stem it is found to be decayed at the base, and usually shows a more or less abundant white mold upon the surface if there is an abundance of moisture. In this mold small, roundish, black bodies develop, which represent one stage of the fungus. This is apparently the same fungus which causes the cottony mold decay of lemons (page 1123) and also. Fig. 8.—Leaf spot of alfalfa (Pseudopeziza medicaginis). stem rot of various other plants. It causes considerable damage to alfalfa at times in this State, and it has been reported as a serious disease in other States. The fungus is common, affecting various plants all over the world. No specific remedy can be suggested, but the disease usually disap- pears to a large extent during the summer and fall. Badly affected fields should be plowed up and used for some other crop for several 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 Smith, Ralph E. (Ralph Eliot), 1874-1953; Smith, Elizabeth H. (Elizabeth Hight), 1877-1933. Berkeley, Cal. : Agricultural Experiment Station
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantdi, bookyear1911
