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Identification of the predominant epidemic-associated genotype of Trichoderma by RAPD-PCR with primer 230. Shown are the gel electrophoretic profiles of isolates 64 and 65 (biotype 1), isolates 62 and 63 (biotype 2), isolates 60 and 61 (T. atroviride), isolates 90 and 91 (biotype 4), and isolate 72 (representing the predominant genotype in Pennsylvania). M, 100-bp DNA ladder. N, negative control in which sterile water was substituted for the DNA template.
