The Effect of Dazomet on Accumulated Annual Bluegrass Seed and Newly Seeded Creeping BentgrassByJacob S. BravoIn the summers of 2016 and 2017, multiple field experiments were conducted at the Hancock Turfgrass Research Center (HTRC) (Michigan State University, East Lansing, MI) to examine efficacy and post-treatment seeding effects of dazomet on renovated turf surfaces. Two experimental sites were used; a simulated golf course fairway and golf course putting green. This study consisted of two factors. The first factor, dazomet rate, included four levels at the fairway height: 131 lb/acre, 262 lb/acre, 525 lb/acre and a non-dazomet control and 5 levels at the greens height: 65 lb/acre, 131 lb/acre, 196.5 lb/acre, 262 lb/acre, and a non-dazomet control. The second factor, re-seeding interval, consisted of 4 levels: 6, 9, 11 (13 in 2017) and 15 days after dazomet treatment. Both sites were prepped with a glyphosate application followed by aggressive cultivation. Dazomet was applied and incorporated with 1 inch of irrigation. Fairway height plots were sealed using subsequent irrigation while the putting green experiment was sealed with a plastic cover. All plots were re-seeded using 1 lb/M ‘Pure Distinction’ creeping bentgrass (CBG). Data was collected on the number of annual bluegrass plants (ABG) and CBG plants that germinated as well as the percent area covered by CBG and percent area unaffected by the dazomet treatment. Fairway height results showed no negative residual effects on the newly seeded CBG. Control of ABG in fairway height was not considered sufficient, likely due to the lack of an impermeable cover and also due to the incorporation method. The greens height results also suggested no substantial effects on seeded CBG regardless of rate or seeding interval. Greens height data showed desirable control of annual bluegrass, further solidifying the essential function of an impermeable cover.
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