Golfdom, February 2017

Super Science Continued from page 35 of each treatment Poa annua cover 0 to 100 percent perennial ryegrass thinning and turf stand quality were evaluated throughout the study ReeVerse Poa did not reduce Poa annua populations Table 2 or improve stand quality data not shown in comparison to the untreated control Overall we saw no reduction in Poa annua or improvement of turf quality from ReeVerse Poa in this and the putting green trial Results of this study suggested that PoaCure has greater postemergence than pre emergence activity on Poa annua Although a total of 24 to 48 oz 1000 sq ft of product applied eight to 12 weeks after overseeding provided among the best Poa annua control PoaCure caused objectionable thinning to the young stand of perennial ryegrass Results of this and subsequent research suggests that superintendents should delay PoaCure applications until at least 12 weeks after overseeding perennial ryegrass In the Coachella Valley this may be too late to eradicate annual bluegrass before it forms objectionable seedheads Barricade prodiamine herbicide applied eight weeks before overseeding also caused perennial ryegrass stand thinning however the effect was observed at the time of emergence data not shown In time enough perennial ryegrass seedlings survived to form an acceptable stand of cool season turf Unlike other golf courses in the area Prograss ethofumesate herbicide continued to be active on Poa annua at Toscana Country Club and no differences were found between the emulsifiable and soluble concentrate formulations although they were applied at different rates If Prograss is losing activity against Poa annua these results suggested that tank mixing with Trimmit paclobutrazol and Primo trinexapacethyl plant growth regulators could help boost Poa annua control Use of PGRs beyond Christmas caused TABLE 2 Number Treatment Rate Timing Poa Cover 3 11 14 1 Control 53 BCD 2 PoaCure 24 oz M 8 WBOS 50 BCDEF 3 PoaCure 12 oz M 8 WBOS 66 A 4 PoaCure 24 oz M 6 WBOS 55 ABCD 5 PoaCure 12 oz M 6 WBOS 59 ABC 6 PoaCure 24 oz M 8 WBOS 6 PoaCure 12 oz M 10 WAOS 33 HIJKL 7 7 PoaCure PoaCure 12 oz M 12 oz M 8 WBOS 10 WAOS 26 IJKLMNO 8 8 PoaCure PoaCure 24 oz M 12 oz M 6 WBOS 10 WAOS 31 HIJKLM 9 9 PoaCure PoaCure 12 oz M 12 oz M 6 WBOS 10 WAOS 35 GHIJK 10 10 10 PoaCure PoaCure PoaCure 12 oz M 12 oz M 12 oz M 8 WBOS 10 WAOS 12 WAOS 23 KLMNOPQ 11 11 11 PoaCure PoaCure PoaCure 12 oz M 12 oz M 12 oz M 6 WBOS 10 WAOS 12 WAOS 19 MNOPQRST 12 PoaCure 06 oz M 6 WAOS 51 BCDE 13 PoaCure 06 oz M 8 WAOS 46 CDEFG 14 PoaCure 06 oz M 10 WAOS 46 CDEFG 15 PoaCure 06 oz M 6 WAOS 15 PoaCure 06 oz M 8 WAOS 15 PoaCure 12 oz M 10 WAOS 21 LMNOPQR 16 16 16 PoaCure PoaCure PoaCure 06 oz M 06 oz M 12 oz M 8 WAOS 10 WAOS 12 WAOS 18 NOPQRSTU 17 PoaCure 12 oz M 8 WAOS 31 HIJKLM 18 PoaCure 12 oz M 10 WAOS 38 FGHIJ 19 PoaCure 12 oz M 12 WAOS 39 EFGHI 20 PoaCure 12 oz M 20 PoaCure 12 oz M 10 WAOS 12 WAOS 18 NOPQRSTU 21 21 PoaCure PoaCure 12 oz M 24 oz M 10 WAOS 12 WAOS 19 MNOPQRST 22 PoaCure 24 oz M 10 WAOS 25 JKLMNOP 23 PoaCure 24 oz M 12 WAOS 31 HIJKLM 24 PoaCure 24 oz M 24 PoaCure 24 oz M 10 WAOS 12 WAOS 16 NOPQRSTU 25 Barricade 05 lb ai A 8 WBOS 35 GHIJK 26 Trimmit 2 SC 6 oz A 8 12 16 WAOS 26 Primo 1 MEC 6 oz A 28 IJKLMN 27 Trimmit 2SC 8 oz A 8 12 16 WAOS 20 LMNOPQRS 28 Trimmit 2 SC 6 oz A 8 12 16 WAOS 28 Primo 1 MEC 6 oz A 28 Tenacity 4 SC 5 oz A 28 IJKLMN 29 29 29 Trimmit 2 SC Primo 1 MEC Prograss EC 6 oz A 6 oz A 64 oz A 6 9 WAOS 10 QRSTUVW 30 30 Tenacity 4 SC Prograss EC 5 oz A 64 oz A 6 9 WAOS 15 NOPQRSTUV 31 Prograss EC 64 oz A 6 9 WAOS 13 PQRSTUVW 32 Prograss SC 36 oz A 6 9 WAOS 32 MSO 05 v v 18 NOPQRSTU 33 Prograss SC 36 oz A 6 9 WAOS 11 QRSTUVW 34 34 ReeVerse Poa ReeVerse Poa 6 oz M 3 oz M 4 WAOS 6 8 10 12 14 16 WAOS 56 ABCD WBOS weeks before overseeding WAOS weeks after overseeding MSO methylated seed oil Percent Poa annua cover 0 to 100 percent on March 11 2014 following chemical applications before and after overseeding on Oct 15 2013 Toscana Country Club Indian Wells Calif Percent Poa annua cover means followed by the same letter are not significantly different α 005 36 Golfdom February 2017 Golfdom com