For a pathologist, I still get that geeked out moment when I walk up and everything is dead," Kerns said. "The fun part is the challenge of helping you to fix that."
"Slight increases in mowing height could be the difference between a fungicide program working, or not," he said. "You might lose some ball-roll speed, but what you make up for in plant health is worth it when you consider (putting on) dirt is really fast." Because of the inconsistencies achieved when setting mowing heights, Kerns said he never leaves home without a prism gauge, and suggested superintendents do the same. "Mowing is the single biggest stress we place on turf," said Kerns, who had extension data to back up his statement. "I spend 80 percent of my time with you guys in golf, and the other 20 percent with sports, sod and homeowners. Why is that? Mowing height." Just as important are limiting shade cover, especially on warm-season turf and slight increases in nitrogen. "There was a time when we were applying 6 to 7 pounds of N per year," Kerns said. "I'm noy asking you to go up a pound, or two, or three or four. There is 10 to 12 years of research that shows if N rates were between .125 and 1.25 per 1,00 square feet per month per year, it had no effect on ball roll. What I'm asking is if you are at a tenth of a pound per week or every two weeks, they go up to an eighth. You're not going to see a dramatic decline in ball, but you're going to see a dramatic improvement to combat disease." He also suggests using a growing degrees day model, like the one developed by Nebraska's Bill Kreuser, Ph.D., to track plant growth regulator applications. Likewise, the benefits of aerification, whether it involves pulling a core or not, cannot be overstated. "The more you can pull cores, the better you'll be," he said. "Pathogens thrive when soil becomes anaerobic." Those who come from Roch Gaussoin's school of solid tining without pulling cores also can achieve great benefits, Kerns said. That can include cooling the soil by allowing air in. "If you punch holes every few weeks, it's like an apple a day: It will keep the doctor away," Kerns said. "It's not that labor intensive when you think of the difference vs. core aerification, and you're going to reap the dividends because you're going to keep that soil temperature down more than somebody who isn't doing it." If, after trying all of this, turf still is under stress, Kerns said don't cut corners when it comes to sending samples to the lab. "Our diagnostics lab usually receives about 500 samples a year. This year, we're at about 660 to 670, and the year's not over yet," Kerns said. "And 53 to 60 percent of what we see is not disease. "If you want us to be accurate, submit and give us the most information you can. That's the key thing with making a diagnosis; it's an art."
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