From the current issue:
Are newer bentgrass cultivars more susceptible to extreme cold than older cultivars? Recent reports of creeping bentgrass winter death in the Northern U.S. prompted researchers at the University of Minnesota to explore this question by studying the freezing tolerance of five bentgrass cultivars developed over the past six decades.
Researchers at the University of Minnesota tested the freezing tolerance of 5 widely used creeping bentgrass cultivars, including Jacklin’s T-1, and discovered significant differences in their ability to tolerate sub-zero conditions for a sustained period. They grew out seedling clones in greenhouse flats, acclimated them for 14 days at 3° C, then transferred them to a freezing chamber. The temperature was reduced in increments over a 12-hour period to - 28° C (about -18° F). The plants were then gradually brought back up to 3°, and brought back to the greenhouse to grow for 35 days. At the end of the 35 days the researchers took a look at the survival of the plants.
Their results showed that T-1 creeping bentgrass and Penncross had a higher freezing tolerance than the other cultivars tested. T-1 has developed a reputation for maintaining a highly managed look on a lower-management budget. It is truly proving to be the “fore-giving” bentgrass under adverse conditions.