Excerpt from Ozonium Root Rot
The next stage in the disease seems to be a penetration - of the cambium and the stele by the mycelium, which appears to progress up and down the main taproot and out into the laterals. In most instances the mycelium is found very abundantly on the bark in advance of the rot.
To judge from the rate at which the plants die in a cotton row, the time from the formation of these depressions to the actual entrance of the fungus is a matter of not more than one or two days. Meanwhile the collar of the plant is inclosed-in a fungous mass composed of strand hyphae and mycelium. The wilting of the plants after this stage is reached is a question of only a day or so.
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