Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] FUSARIUM 491 I being prevented from ascending the stem, owing to the I vessels being filled with mycelium. The root is the part first attacked, the fungus entering through the root-hairs I and eventually forming a dense mass of mycelium in the j vascular portion of the root and stem for some distance I above the collar. If at this stage the stem is split open just above the collar, the vascular bundles are seen to be brown ! in colour, due to the presence of a brown substance in
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] FUSARIUM 491 I being prevented from ascending the stem, owing to the I vessels being filled with mycelium. The root is the part first attacked, the fungus entering through the root-hairs I and eventually forming a dense mass of mycelium in the j vascular portion of the root and stem for some distance I above the collar. If at this stage the stem is split open just above the collar, the vascular bundles are seen to be brown ! in colour, due to the presence of a brown substance in the I Fig. 148.—Fusariumlycopersici. \, Diplocladiiim stage; 2, Fusarium stage; 3, resting spores. All highly mag. vessels, caused by the mycelium. Shortly after the plant has drooped, the portion of stem just above ground becomes more or less covered with a delicate, white film of hyphae. This is the first conidial condition of the fungus, known as the Diplocladium stage. This is followed by a second or Ftisarium stage, which originates from the same mycelium that produced the first stage. Numerous strands of mycelium spread from the roots into the soil, and there form resting- spores which remain in a passive condition in the soil until
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