Field Trial - Efficacy Increase

Macro-Sorb® Foliar Increases Efficacy of Primo®

Study conducted by Dr. Watschke, Borger and Brosnan, Pennsylvania State University


The objective of this study was to determine the efficacy of Primo® in a tank mix with Macro-Sorb® Foliar for clipping reduction of creeping bentgrass (Agrostis stolonifera L.).  This study was conducted on a mature stand of creeping bentgrass maintained as a golf course fairway at the Valentine Turfgrass Research Center, University Park, PA.  Treatments consisted of: Primo® at 0.5 fl oz./M + Urea at 0.2 lbs. N/M, Primo® at 0.25 fl oz./M, and Primo® at 0.25 fl oz./M + Macro-Sorb® Foliar at 2.0 fl oz./M.  Treatments were reapplied on 14-day intervals.  All treatments reduced clipping yields compared to the untreated control. By adding Macro-Sorb® Foliar, fresh clipping yields were reduced 35% when applied with Primo® at 0.25 fl oz./M.

“It appears from this experiment that using half rates of Primo® in combination with Macro-Sorb® foliar is equal to or more efficacious than using full label rates.”  - Dr. T.L. Watschke, Professor Emeritus of Turfgrass Science 

Figure 1. Clipping weights of creeping bentgrass 10 days after treatment application.