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Some effects of Ceratocystis ulmi on the phloem and vascular cambium of Ulmus americana

, : Some effects of Ceratocystis ulmi on the phloem and vascular cambium of Ulmus americana. Canadian Journal of Botany 50(5): 1009-1011 + 1 pl.

Preliminary studies of microscopic sections from stem and branch samples of Ulmus americana trees naturally infected with C. ulmi showed that abnormalities occur in the vascular cambium and secondary phloem. The abnormalities include deposition of callose on sieve plates, septation of fusiform initials, lack of fibre differentiation, and accumulation of lipoidal substances in the vascular cambium.


DOI: 10.1139/b72-123

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