Effect of Age of Cotton Seedlings on their Susceptibility to Rhizoctonia Damping-off


DAMPING-OFF fungi are known to destroy seedling plants during the first four–six weeks after germination. Tint1, in his studies on Fusarium damping-off of conifers, reported a direct correlation between resistance to invasion and increasing age of host. Matus2 found that cotton plants were invaded by Corticium vagum throughout the growing period, although susceptibility appeared to decline as the plant grew older. Linnasalmi3 also reported that attack by Rhizoctonia solani on cabbage, cucumber and tomato was most severe at the pre-emergence phase. Koba4 stated that cotton seedlings proved very susceptible to damping-off caused by Fusarium spp. at the eight- to fifteen-day old stage when stored food is exhausted and photosynthesis is low.

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  1. 1

    Tint, Phytopath., 35, 440 (1945).

  2. 2

    Matus, T., Ann. Phytopath. Soc. Japan, 13, 3 (1949).

  3. 3

    Linnasalmi, A., Ann. Bot. Soc. Vanamo, 26, 1 (1952).

  4. 4

    Koba, S., Ann. Phytopath. Soc. Japan, 18, 1 (1953).

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