Spring dead spot and take-all root rot are among the most damaging diseases of bermudagrass putting greens throughout the transition zone. These diseases attack during the fall and spring when bermudagrass is growing slowly, with the potential to cause long-term reductions in playability. Both diseases begin to damage roots in the late summer to fall, so this is the key time to begin a preventative fungicide program. • Take-all root rot activity begins in mid- to late-summer when soil temperatures are consistently below 80°F. Typically August 15 to September 15 depending on location. • Spring dead spot activity begins in late summer to fall when soil temperatures drop to 70°F or less. With proper application timing and the best rotation of products, take-all root rot and spring dead spot can be managed very effectively as part of a program approach. Syngenta has developed this recommended program through years of research with the leading universities in the transition zone. Preventive late-summer to fall fungicide applications, prior to dormancy, are recommended to protect the turf from pathogen attack and ensure acceptable turf quality in the spring. Spring Dead Spot + Take-all Root Rot Guarantee
SPRING DEAD SPOT CONTROL IN ‘TIFEAGLE’ BERMUDAGRASS Dr. Joseph Roberts Clemson University
Trefinti ® nematicide/fungicide
Untreated
Resilia ™ fungicide (4 fl oz/1,000 ft 2
(3.8 fl oz/10,000 ft 2 )
Treatments applied July 2, July 30, Aug 27, and Sept 24, 2024. Watered-in immediately with 1/8” of irrigation. Photos taken May 15, 2025.
Introducing the Spring Dead Spot + Take-all Root Rot Guarantee for Bermudagrass Putting Greens in the Transition Zone
Application
Approximate Date
Product Recommendations
Trefinti ® 3.8 fl oz/10,000 ft 2 (spot-treatment rate) Trefinti ® 3.8 fl oz/10,000 ft 2 (spot-treatment rate)
1
August 1st
2
September 1st
3
October 1st
Briskway 1.2 fl oz/1000 ft 2
4
November 1st
Posterity Forte 0.84 fl oz/1000 ft 2
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