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Indaziflam on warm-season native grasses in rough

Wiregrass injury on June 20, 2015, six weeks after summer application. A. Specticle FLO (9 fl. oz. /acre) B. Specticle FLO (9 fl. oz. /acre) + Roundup PRO (4 qt. /acre) C. Specticle G (200 lbs. /acre) + Roundup PRO (4 qt. /acre) D. Specticle Total (44 pt. /acre)

Wiregrass injury on June 20, 2015, six weeks after summer application.
A. Specticle FLO (9 fl. oz. /acre)
B. Specticle FLO (9 fl. oz. /acre)
+ Roundup PRO (4 qt. /acre)
C. Specticle G (200 lbs. /acre)
+ Roundup PRO (4 qt. /acre)
D. Specticle Total (44 pt. /acre)

Native warm-season grasses are popular choices for low-maintenance rough on golf courses. They require minimal inputs to maintain but still require some maintenance. Annual grasses and invasive plants can be problematic within these systems, so herbicides often are needed for control.

Research at Mississippi State University seeks to evaluate the safety of pre-emergence herbicides in native warm-season grass stands. This study evaluated the safety of indaziflam (Specticle, Bayer) and a non-selective herbicide glyphosate (Roundup Pro, Monsanto) on wiregrass (Aristida virgata) and Indiangrass (Sorghastrum nutans).

Indaziflam is an alkylazine herbicide that provides pre-emergence control of annual grasses and broadleaf weeds. Its mode of action may benefit users in controlling resistant weeds.

A multi-site field study was established at The Preserve Golf Club, Vancleave, Miss., and at the R.R. Foil Plant Science Research Center. Foliar applications were applied using a CO2 backpack sprayer at 32 gal. water/acre. Granular material was applied by hand over the entire plot. Treatments included Specticle FLO (9 fl. oz./acre) + Roundup PRO (4 qt./acre), Specticle G (200 lbs./acre) + Roundup PRO (4 qt./acre), Specticle FLO (9 fl. oz./acre), Specticle Total (44 pt./acre) and a non-treated. Three treatment application timings were used: dormancy, spring transition and during peak summer growth. Individual plots were treated at each application timing.

Application timing affected grass safety only when treatments included Roundup Pro. In general, dormant applications of Specticle alone and in combination with Roundup Pro were safe on wiregrass and Indiangrass. However, during active spring and summer growth, Specticle + Roundup Pro combinations reduced wiregrass and Indiangrass dry-weight yield almost 40 percent, and up to 100 percent compared to the non-treated. Results indicate that Specticle as a stand-alone product is safe on wiregrass and Indiangrass.

Michael Richard is a Ph.D. candidate and James McCurdy, Ph.D., and Brian Baldwin, Ph.D., are turfgrass scientists at Mississippi State University. Michael can be reached at mpr160@msstate.edu for more information.

Photo: Michael Richard

This is posted in Featured, Research


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