Publication Date
1985
Location
Kyoto Japan
Description
The poor persistency of red clover ( Trifolium pratense L.) is the most serious problem for hay production in the Hokkaido district. Clover rot ( causal agent Sclerotinia trifoliorum Erikss.) is one of the virulent diseases which kill red clover during winter. We made the quantitative analysis of the damage due to clover rot and clarified the types of resistant red clover from 1982 to 1984. Three treatments, consisting of control, fungicide (thiophanate-methyl) application and inoculation with pathogens, were applied on pure and mixed stands of three cultivars and one seed lot of red clover. The dry matter yield in the inoculated plots was 28% (1983) and 44% (1984), less than the control in pure stand, respectively. The decrease was 21 % (1983) and 7% (1984) in mixed stand because of the compensation by timothy. The yield of the fugicide-treated plots surpassed the control by 23% in pure and 11 % in mixed stand in 1984. There was a varietal difference in resistance. "Medium" and "Sapporo" certified seed lot showed 81 % and 41 % less yield than "Sapporo" breeder's seed lot in pure stand in 1984. Contrary to these two cultivars, late-flowering tetraploid "Pajbjbergfonden" showed only 15% less yield. We conclude that clover rot causes more serious reduction of red clover yield with increasing age of the stand, and that a variety selected from ecotypes in Hokkaido and late-flowering tetraploid can offer gene sources of resistance. The results from the fungicide plots demonstrated that if the damage is minimized by producing a resistant cultivar, the persistence of red clover will be considerably improved.
Citation
Matsuura, M; Matsumoto, N; Sawai, A; Gau, M; and Ueda, S, "Resistance of Red Clover Cultivars to Clover Rot in Pure and Mixed Stands with Reference to Breeding Work" (1985). IGC Proceedings (1985-2023). 39.
(URL: https://uknowledge.uky.edu/igc/1985/ses2/39)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Resistance of Red Clover Cultivars to Clover Rot in Pure and Mixed Stands with Reference to Breeding Work
Kyoto Japan
The poor persistency of red clover ( Trifolium pratense L.) is the most serious problem for hay production in the Hokkaido district. Clover rot ( causal agent Sclerotinia trifoliorum Erikss.) is one of the virulent diseases which kill red clover during winter. We made the quantitative analysis of the damage due to clover rot and clarified the types of resistant red clover from 1982 to 1984. Three treatments, consisting of control, fungicide (thiophanate-methyl) application and inoculation with pathogens, were applied on pure and mixed stands of three cultivars and one seed lot of red clover. The dry matter yield in the inoculated plots was 28% (1983) and 44% (1984), less than the control in pure stand, respectively. The decrease was 21 % (1983) and 7% (1984) in mixed stand because of the compensation by timothy. The yield of the fugicide-treated plots surpassed the control by 23% in pure and 11 % in mixed stand in 1984. There was a varietal difference in resistance. "Medium" and "Sapporo" certified seed lot showed 81 % and 41 % less yield than "Sapporo" breeder's seed lot in pure stand in 1984. Contrary to these two cultivars, late-flowering tetraploid "Pajbjbergfonden" showed only 15% less yield. We conclude that clover rot causes more serious reduction of red clover yield with increasing age of the stand, and that a variety selected from ecotypes in Hokkaido and late-flowering tetraploid can offer gene sources of resistance. The results from the fungicide plots demonstrated that if the damage is minimized by producing a resistant cultivar, the persistence of red clover will be considerably improved.
