Influence of a Benzimidazole-Tolerant Isolate ofCeratocystis ulmion the Control of Dutch Elm Disease with Methyl 2-Benzimidazole Carbamate Phosphate

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Abstract
American elm (Ulmus americana) seedlings 10.0-20.0 cm in diameter at breast height (dbh) were inoculated with either a benzimidazole-sensitive (WI) or a benzimidazole-tolerant (WIT) strain of C. ulmi. When Dutch elm disease symptoms appeared, trees were injected with Lignasan BLP (methyl 2-benzimidazole carbamate phosphate) at either 0.8 or 4.0 g/2.5 cm dbh. Dutch elm disease symptoms were reduced below the control level only in trees inoculated with the WI strain and treated with Lignasan BLP at 4.0 g/2.5 cm dbh. Fungitoxicants were recovered from the symptom-bearing branches of a higher percentage of WI-inoculated elms than from WIT-inoculated elms. Decreased reisolation of the WI but not of the WIT strain occurred with increased fungicide concentration. The benzimidazole sensitivity of the WI and WIT strains remained stable, and the pathogenicity of the 2 strains did not differ significantly as measured by disease development from Aug. 1976 through July 1978.

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