Manganese and take-all patch

PACE Turf has adjusted guidelines for manganese availability to suppress take-all patch caused by Gaeumannomyces spp. to match the manganese availability index (MnAI) of 45 recommended by Heckman et. al. To simplify the guidelines, 17 ppm Mehlich III manganese will provide sufficient manganese to suppress take-all patch up to a pH of 8.0. Higher levels are not expected to improve suppression of take-all patch caused by Gaeumannomyces spp. The table below illustrates the range of soil manganese that will result…