Abstract
Microscopic examination of stained sections made from alfalfa crown buds artificially inoculated with typical crown bud isolates of Rhizoctonia solani Kühn, Fusarium avenaceum (Fr.) Sacc., Fusarium acuminatum (Ell. & Ev.) Wr., and Ascochyta imperfecta Peck indicates their respective abilities to cause crown bud rot under conditions similar to those found in the field. Identifiable portions of these fungi are shown and their growth within the host tissue is described.
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