Macro-PHITE is Raising the Bar for Potassium Phosphite Fertilizer

Study Shows Macro-Sorb Products Enhance Plant Health Leading to Reduced Pythium Blight


A recent Turfgrass Disease Solutions study showed that products from Macro-Sorb, Inc. were useful in improving plant health to aid in managing Pythium blight development in golf course turf.

An independent researcher, Steve McDonald, of Turfgrass Disease Solutions, studied Pythium blight development after applications of Macro-Sorb’s Macro-PHITE® on perennial ryegrass seedlings. Macro-PHITE is a potassium phosphite fertilizer enhanced with Macro-Sorb’s amino acid technology aimed to improve plant health. He made three applications of the product at 1.0 oz., 1.5 oz. and 2 oz. per 1,000 sq. ft. every 14 days after seedling emergence for a total of four applications.

McDonald compared those treatments against a generic potassium phosphite fertilizer currently on the market, as well as Subdue and Banol fungicides.

Results showed that the higher rate of Macro-PHITE resulted in less than one percent Pythium and the lowest rate had less than 5% Pythium, comparable to the Subdue and Banol treated plots. The generic phosphite fertilizer treatment – at labeled rate – had 16% Pythium, whereas the untreated plot had almost 30% Pythium present.

“When applied to turfgrass, the unique complex of amino acids contained in Macro-PHITE boosts the natural defense mechanisms of the plant,” said John Haguewood, technical manager for Macro-Sorb. “The turfgrass plant basically puts up a shield, defending itself from stresses.”

Based on the study results, Haguewood recommends adding Macro-PHITE to preventive Pythium fungicide programs. “Some superintendents have moved to using potassium phosphite fertilizer alone as a preventive Pythium treatment,” he added. “But I always recommend using potassium phosphite fertilizer in combination with fungicides as an added protection. The low use-rates, tank mix compatibility, and improved plant health are all bonuses superintendents will receive when using Macro-PHITE.”

Figure 3.  Percent Pythium-blighted turf following applications of potassium phosphite fertilizers and common fungicides.Pythium Blight Data.png.Any questions regarding this research can be directed to John Haguewood, Technical Manager for Macro-Sorb Technologies and SMS Additive Solutions.

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