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One of the most prevalent diseases in warm season grasses such as centipede, zoysia, and St. Augustine is large patch (Rhizoctonia solani). Shorter days and cooling temperatures slow growth, which ...
This fungus creates irregular, brown, and sometimes sunken patches on your lawn. Overwatering: It might sound strange, but giving your lawn too much water can actually cause problems.
Preventive fungicide applications are recommended when soil temperatures are between 55–60 °F (13–16 °C). Brown ring patch is not controlled by thiophante-methyl or other benzimidazole fungicides. [11] Fungicides can be applied in a water volume of 2 gal./1,000 sq. ft. and lightly watered in following application. [11]
Brown patch symptoms differ depending on the various maintenance practices performed on the turfgrass (mowing height, fertilizer, watering, etc.) Symptoms on turfgrasses that are wet for extended periods and are closely mowed will produce a distinctive gray-purplish bordered ring "smoke-ring" that is up to 50 cm in diameter. [3]
Dollar spot is most commonly found on closely mowed turfgrasses. The pathogen infects most cool and warm-season grasses throughout the world, including creeping bentgrass (Agrostis stolonifera), annual bluegrass (Poa annua), Kentucky bluegrass (Poa pratensis), perennial ryegrass (Lolium perenne), hybrid bermudagrasses (Cynodon dactylon x tranvaalensis), seashore paspalum (Paspalum vaginatum ...
The fungus also infects fescues and bentgrasses (11). It is common in sodded lawns, rapidly growing lawns, and lawns with layered soil (3). The pathogen produces circular patches of bald spots that are tan or yellow in color (12). These patches are about 5 to 10 cm in diameter, but can grow to be about 1 meter in diameter.