

According to a multi-university study, the average cost to recover from winter injury caused by factors such as crown hydration, desiccation, ice encasement, exposure to low temperatures, snow mold and winter stress ranges from $6,000 to $8,999. Expenses associated with preventing that damage can cost twice as much, according to the study conducted by researchers at the University of Minnesota, University of Wisconsin, Michigan State University and the University of Massachusetts.
The study comprised responses to an online survey from 96 golf course superintendents. The results were published recently in the Journal of American Society for Horticultural Science.
"This wasn't scientific, peer-reviewed research, but it gives us good numbers to work from moving forward," said study co-author Paul Koch, Ph.D., at the University of Wisconsin.
Other authors attached to the study were Doug Soldat, Ph.D, Eric Watkins, Ph.D., Chengyan Yue, Ph.D., and Uma Parasuram, Ph.D., of Minnesota; Kevin Frank, Ph.D., of Michigan State; and Michelle DaCosta, Ph.D., of Massachusetts. Click here to read the complete results of the study.
Creeping bentgrass was the predominant turf on greens, tees and fairways, with Kentucky bluegrass comprising most of the rough area acreage. Annual bluegrass, among the most susceptible varieties to winter damage, covered 33 percent of the greens in the survey, 23 percent of fairways, 20 percent of tees and 16 percent of rough areas.
A survey of nearly 100 golf course superintendents revealed ice encasement is a common concern during winter. Photo by Kevin Frank, Ph.D., Michigan State University Even in areas growing cool-season turf, winter damage is only an occasional issue.
"It's been 12 or 14 years since the last big winter damage event in Wisconsin," Koch said. "Winter damage is probably not on anyone's radar until there is a big ice event."
Ice encasement was the most common cause of winter damage reported, with 70 percent of the respondents citing it as an issue, followed by crown hydration (59%), snow mold (54%), desiccation (46%), low temperatures (26%), de-hardening (15%) and other (6%).
It should come as no surprise that the survey revealed that annual bluegrass is more susceptible to winter damage than other cool-season turfgrasses.
Specific to annual bluegrass, de-hardening was reported by 71 percent of respondents, followed by crown hydration (56%), low temperature exposure (48%), ice encasement (46%), desiccation (40%) and snow mold (27%).
Methods of prevention vary not only from one turf variety to another, but also between types of damage. Ice encasement can be prevented by removing ice after a long period of time, other crown hydration, and a one-time investment in greens covers can help minimize the threat of crown hydration, exposure and desiccation. Snow mold prevention is a recurring expense that can have limited effectiveness.
A recent snow mold event affected fairways on golf courses throughout southern Wisconsin.
"Fairways got hammered, but most of it was gone by May," Koch said.
"They're probably thinking why spend $10,000 on snow mold prevention in fairways if I only get it every 10 years."
Incidence of snow mold is weather dependent, and treatments can have limited effectiveness depending on local conditions. Efficacy can be shortened by repeated rain or snow events, especially early after applications are made, and by extended winter conditions at the end of the season.
"Any time there is snow melt or rain, (fungicides) can wash away pretty quickly," Koch said. "It's not like we didn't get any impact, but at some point it is going to dissipate and won't persist all winter. How much injury there is from fungus also depends on how much snow we get late in the season when the product is out of reserves."
The goal of the study was to assign costs to recovering from winter damage as well as trying to prevent it.
On average, the costs of preventing winter injury ranged from $12,000 to $17,999 per year per golf course, according to the survey. Additional costs of inputs to recover from winter injury were between $6,000 and $8,999 per year per golf course and included weed-control products, seed, fertilizer, equipment and labor.
Survey respondents were asked to report average annual revenue loss due to delays in golf course openings caused by winter injuries and revenue loss due to delayed openings in years with considerable winter injuries.
According to survey results it can cost more to prevent winter damage than it is to recover from it. USGA photo The average annual revenue loss in normal years ranged from $3,000 to $5,999, and $6,000 to $8,999 in years with considerable winter injury. About half of the courses reported no revenue loss due to delayed openings from winter injuries, and about a quarter of respondents reported revenue losses of less than $5,999. A total of 3 percent of those responding reported revenue losses exceeding $75,000.
Researchers also attempted to identify the cost of winter injury per acre by using the self-reported acreage data from the survey. On average, the cost of preventing winter injuries was approximately $200 per acre, with a median of $121 per acre. However, some golf courses spent more than $3,000 per acre.
The additional cost to recover from winter injuries in years with normal winter injuries was about $89 per acre on average and went up to $147 per acre on average in years with considerable winter injuries.
Finally, the revenue losses averaged about $115 per acre in years with normal winter injuries and $159 per acre in years with considerable winter injuries. Some courses reported no revenue loss, while some reported higher losses up to $3,055 per acre.
The research team concluded that the study can help superintendents make informed decisions when managing turf for winter damage. They also wrote that further research with a larger sample size would result in better data.
"We would have liked more respondents," Koch said. "We probably could fix that by making a shorter survey. If they're too long, people don't want to do it."
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