AI Article Synopsis
- Speckled snow mold, caused by the fungus Typhula ishikariensis, is a major issue for turfgrass in subarctic regions, particularly affecting golf courses in Wisconsin.
- Nine isolates of three T. ishikariensis varieties were tested against nine bentgrass cultivars, revealing that increased inoculum concentration led to higher disease severity, and susceptibility varied with plant age.
- The study found significant differences in aggressiveness among T. ishikariensis varieties and highlighted that some bentgrass species and cultivars show varying levels of resistance, indicating the need for targeted screening in developing resistant turfgrass.
Article Abstract
Speckled snow mold, caused by Typhula ishikariensis, is one of the most important Typhula snow molds in subarctic zones of the Northern Hemisphere. Nine isolates of three T. ishikariensis varieties (var. ishikariensis, var. canadensis, and var. idahoensis) isolated from infected turfgrasses on golf course fairways throughout Wisconsin were evaluated for their aggressiveness toward nine cultivars of three bentgrass species (three creeping, three colonial, and three velvet cultivars) under controlled environmental conditions. Speckled snow mold severity increased as inoculum concentration of T. ishikariensis was increased. In general, bentgrass susceptibility increased between 9 and 11 weeks after seeding but gradually decreased thereafter, suggesting expression of age-related resistance as plants matured. Significant differences in aggressiveness were detected within and among T. ishikariensis varieties. Significant interactions between T. ishikariensis varieties or isolates and bentgrass species were detected, but there was no interaction between pathogen isolates and bentgrass cultivars. Disease severity evaluations showed significant differences among bentgrass cultivars and species in their response to T. ishikariensis. Since bentgrass species exhibit differential responses to T. ishikariensis varieties, representative isolates of each variety should be employed for screening of bentgrass germplasm for resistance to speckled snow mold.
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| http://dx.doi.org/10.1094/PD-90-0951 | DOI Listing |
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