Have you seen more take-all root rot in St. Augustine grass this year?
Have you been applying iron to turf during the summer N & P fertilizer ban? Do you apply manganese along witht the iron?
There may be a link between applications of iron (Fe) without applications of manganese (Mn) promoting manganese deficiency. The ratio of Fe:Mn should not be less than 2:1. Mn deficiency seems to make the turf more susceptible to take-all root rot.
Please let me know of your experience out in the field. This may change UF recommendations for turf growing on high pH soils, or those irrigated with alkaline water. Post your comment below. Thanks.