Abstract
Abstract Ten fungicidal treatments with and without 2-chloroethylphosphonic acid (ethephon) at 1000 ppm were applied to Fusarium-inoculated, dormant cormels by soaking or by vacuum infusion. Water-control treatments resulted in nearly complete disease loss by F. oxysporum f. sp. gladioli Sny. & Hans. Treatments with 2-(4-thiazolyl)benzimidazole (TBZ) or methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate (benomyl) were effective in controlling the disease. Application of TBZ suspension by vacuum infusion increased corm and cormel production over the soak treatment. The effectiveness of TBZ was increased also by adding 100 ppm Ortho X-77 Spreader, or by adding phosphoric acid to dissolve the chemical at pH 3. The addition of ethephon increased corm production in the 10 treatments by 50% and cormel production by 90%. The increases in corm and cormel production were, respectively, 61 and 116% where ethephon was added to the most effective vacuum infusion treatments, namely: TBZ + X-77, TBZ + phosphoric acid, and benomyl + X-77 with or without dimethylsulfoxide (DMSO).
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