. Fungous diseases of plants, with chapters on physiology, culture methods and technique . Fig. 19. Cluu Root of Cabbage, pro-duced 15 V PlasmodiophoraBrassic^ Wur. MYXOMYCETES. SLIME MOLDS 99 varieties of cabbage, cauliflower and Brussels sprouts {Brassicaoleracea)y turnip {Brassica campestris), rutabaga {Brassica Rapa),radishes {Raphaims sativa), and certain mustards (Sinapis andBrassica). It has also been found upon such weeds as shepherdspurse {Capsclla Bnrsa-pastoris) and hedge mustard {Sisymbriumofficinale). In Europe besides most of the plants mentioned MatJii-. FiG. 20. A Cross Section
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . Fig. 19. Cluu Root of Cabbage, pro-duced 15 V PlasmodiophoraBrassic^ Wur. MYXOMYCETES. SLIME MOLDS 99 varieties of cabbage, cauliflower and Brussels sprouts {Brassicaoleracea)y turnip {Brassica campestris), rutabaga {Brassica Rapa),radishes {Raphaims sativa), and certain mustards (Sinapis andBrassica). It has also been found upon such weeds as shepherdspurse {Capsclla Bnrsa-pastoris) and hedge mustard {Sisymbriumofficinale). In Europe besides most of the plants mentioned MatJii-. FiG. 20. A Cross Section of Cabbage Root affected by the ClubRoot Fungus. (Invaded cells enlarged and phloem tissue multiplied) ola incana and Iberis timbellata are hosts. There seems to be littlerecent data of interest bearing upon the comparative susceptibilityof different varieties of cultivated plants. Many mistakes havedoubtless 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 todiiTtinguish between the two causes of disease. IOC FUNGOUS DISEASES OF PLANTS Tk?.^U->•^>.^rS.:..^•Vt »>>.
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