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Evaluation of Primo Maxx on Fairway Height Creeping Bentgrass





Turf grass treated with Primo MAXX plus Sync using the XC or M nozzles had significantly less fresh clipping yield.


Penn State University conducted a study on a mature stand of creeping bentgrass and annual bluegrass at the Valentine Turfgrass Research Center. The objective of the study was to determine the efficacy of varying nozzle types (droplet size) to apply Primo MAXX alone or in combination with Sync Fungicide Activator and using color ratings and measurements of plant height and foliar fresh weight yield.

This study was a randomized complete block design with three replications. The plot size was 40 square feet. All treatments were applied using a four foot battery powered walk behind boom sprayer calibrated to deliver 1 gpm using two nozzles of varying types/droplet size at 40 psi. The test site was maintained similar to that of a golf course fairway with respect to irrigation and mowing.

The study received 0.5 lbs. nitrogen per thousand before the trial was initiated and 0.25 lbs. N/M every month thereafter from a liquid methylene urea source. Clipping weights were taken once a week with a John Deere walk behind reel mower bench set to 0.485'' with an actual height of cut 0.500''.

Turfgrass color was evaluated nine times during the study (Table 1). At no time during the study did treated or non turfgrass color ratings fall below acceptable. Turfgrass treated with Primo MAXX plus Sync using XR Tee Jet XR11004 nozzles or Turf Jet 1/4TT J04 (XC) nozzles had significantly shorter height compared to non-treated turfgrass. Turfgrass treated with Primo MAXX alone using M nozzles had significantly shorter height than non treated turfgrass.

Turfgrass treated with Primo Maxx alone or combined with Sync using the XC nozzles and Primo Maxx plus Sync using the M nozzles had significantly less fresh clipping yield than non-treated turfgrass.








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