Fungous diseases of plants . Fig. 19. Club Root of Cabbage, pro-duced BY PLASMODlOPHORABKASSICye^OK MYXOMYCETES. SLIME MOLDS 99 varieties of cabbage, cauliflower and l^russels sprouts {Ih-assicaolcracca), turnip {Brassica campcstris), rutabaga {Brassica Rapa),radishes {Rap/ia^ms sativa), and certain mustards (Sinapis andBrassica). It has also been found upon such weeds as shepherdspurse {Capsclla Bursa-pastoris) and hedge mustard {Sisyvibrumiofficinale). In Europe besides most of the plants mentioned ]\Iathi-. FiG. 20. A Cross Section of Cabbage Root affected by the ClubRoot Fungus. (Invaded c
Fungous diseases of plants . Fig. 19. Club Root of Cabbage, pro-duced BY PLASMODlOPHORABKASSICye^OK MYXOMYCETES. SLIME MOLDS 99 varieties of cabbage, cauliflower and l^russels sprouts {Ih-assicaolcracca), turnip {Brassica campcstris), rutabaga {Brassica Rapa),radishes {Rap/ia^ms sativa), and certain mustards (Sinapis andBrassica). It has also been found upon such weeds as shepherdspurse {Capsclla Bursa-pastoris) and hedge mustard {Sisyvibrumiofficinale). In Europe besides most of the plants mentioned ]\Iathi-. FiG. 20. A Cross Section of Cabbage Root affected by the ClubRoot Fungus. (Invaded cells enlarged and phloem tissue multiplied) ola incaiia and Ibcris unibcllata are hosts. There seems to be littlerecent data of interest bearing upon the comparative susceptibilityof different varieties of cultivated plants. Many mistakes havedoubdess been made in assigning to this fungus injuries appear-ing upon other orders of host plants, and sometimes even thoseupon crucifers, due to nematode worms. It is often difficult todistinguish between the two causes of disease. lOO FUNGOUS DISEASES OF PLANTS Morphology. Fungus and deformity. The parasite is sup-posed to gain entrance to the host plant during the swarmsporestage, or immediately upon leaving the swarmspore stage, there-fore in the amoeboidal form. No observations, however, have been made relative to m^yL^-^^jr-f. c
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