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Benomyl (methyl 1-[butylcarbamoyl]-2-benzimidazolecarbamate) fungicide was applied as a soil drench to red clover (Trifolium pratense L.) field plots in June 1970, the second growing season. Forage yields from the benomyl-treatcd plots were significantly higher than yields from the untreated plots in 1970 and 1971. In September 1971, benomyl-treated plots had more plants, many of which were large and were classified as original plants; more root borers (Hylastinus obscurus [Marsham] per plant; and fewer weeds than did the untreated plots. Fusarium was the only pathogenic fungus consistently isolated from rotted roots in September 1971.
Key Words: Fusarium root rot Clover root borer Fungicide
2 Research Plant Pathologist, Plant Pathologist, and Research Entomologist, respectively, ARS, USDA, University Park, PA.
Received for publication May 10, 1973.
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