As summer transitions toward fall, it is important for golf course superintendents across the Southeast to begin shifting their maintenance philosophy from aggressive cultivation to turf preservation and refinement. While daytime temperatures may still feel high, the environment is changing in ways that gradually slow down warm-season turfgrass recovery. I have always used Labor Day as an important milestone for major cultural practices to be complete and putting surfaces fully healed. From that point forward, the focus should be on maintaining optimal playing conditions rather than recovering from disruption.
Throughout the peak growing season, aggressive cultural practices are often necessary to manage organic matter, improve drainage, and encourage root growth and oxygen exchange. However, as the recovery window begins to narrow, less-disruptive practices become increasingly valuable. Solid-tine aerification and sand injections offer effective methods of incorporating sand into the profile, diluting organic matter and improving drainage without the extensive healing associated with traditional large-diameter core aerification. These practices allow superintendents to continue improving soil conditions while also preserving surface quality as growth slows.
Surface management should also evolve during this period. Rather than aggressively removing material with Gradens or carbide-tipped verticutters, light grooming programs using smooth star blades on cutting units provide the desired improvements in ball roll and surface uniformity with significantly less injury to the turf canopy. Grooming promotes upright growth, reduces grain, and improves mowing quality without creating excessive stress or lengthy recovery periods. Preserving leaf area and density becomes important as the days get shorter and cooler.
Having greens in a good spot by Labor Day is an excellent target to aim for. Courses that are still healing beyond this point often enter the fall with compromised playing conditions and turf that is less prepared for seasonal changes. Although it may not feel like summer is ending, days are becoming shorter, sunlight duration is decreasing, and the sun’s angle continues to decline. These factors reduce photosynthetic potential and slow the turf’s ability to recover from mechanical injury, even when afternoon temperatures remain high. Recovery that occurred rapidly in July may require considerably more time in September.
By recognizing these seasonal changes and transitioning to less-aggressive cultivation practices, superintendents will have healthier turf and more-consistent putting surfaces heading into the busy fall season. Entering fall in maintenance mode rather than recovery mode will position your golf course for greater seasonal success.
Southeast Region Agronomists:
Jordan Booth, Ph.D., senior director, USGA Course Consulting Service – jbooth@usga.org
Chris Hartwiger, director, Agronomy – chartwiger@usga.org
Chris Neff, senior agronomist – cneff@usga.org
Mitch Leininger, agronomist - mleininger@usga.org