. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 345 Club-root of cabbage, radish, turnip and other cruciferous plants (Plasmodiophora brassicae Wor.). This disease is not un- common in Minnesota but the exact extent of its distribution is not known. The cause of the disease is not a true fungus but is a slime mold or fungus animal. It forms no fungus threads but produces spores somewhat similar to those of the true fungi. The spores gain entrance to the host plant, usually in the root region though the parasite may also exist in the Fig. 179.—Club-root of turnips.
. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 345 Club-root of cabbage, radish, turnip and other cruciferous plants (Plasmodiophora brassicae Wor.). This disease is not un- common in Minnesota but the exact extent of its distribution is not known. The cause of the disease is not a true fungus but is a slime mold or fungus animal. It forms no fungus threads but produces spores somewhat similar to those of the true fungi. The spores gain entrance to the host plant, usually in the root region though the parasite may also exist in the Fig. 179.—Club-root of turnips. 1. Strap-leaf. 2. Aberdeen. 3. Rutabaga. 4. Snowball. 5. Golden Ball. 6. Cowhorn. 7. Kashmyr. After Halsted. It lives within the host in a truly parasitic manner, destroying the cells in which it dwells. It causes, however, great stimula- tion of the tissues of the host, so that the latter produces wart- like growths on its roots. The roots, moreover, become much distorted, hence the common name of club root. The host plant is much weakened by the attack and usually fails to head out. The roots soon decay and thus the animal organisms, which have already formed great numbers of spores, return to. 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 Freeman, Edward Monroe, 1875-. Saint Paul, Minn.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantdi, bookyear1905
