Golfdom, October 2012

www turfgrasstrends com October 2012 TURFGRASS TRENDS 37 tently sound results However few turf managers would want to chain themselves to their sprayers for this kind of application schedule Similar results can be obtained by applying 01 lbs a i acre 32 fl oz product acre twice a week totaling five applications If we exclude the October trial because of the cooler temperatures and different results the five application treatment regime resulted in 70 percent control when averaged over the other five trials while the 10 application treatment yielded an average of 80 percent control So for half of the labor youll give up an extra 10 percent on average of annual bluegrass control Treatments initiated in the cooler weather of late fall also look promising but would require a different strategy Under these conditions applications of 017 lbs a i acre 53 fl oz product acre applied three times on a 14 day interval appear to be most effective These results support work done by Reicher and his colleagues Reicher et al 2010 who reported effective control from fall applications with similar rates and timings We continue to attempt to improve the efficacy of Tenacity for annual bluegrass control by examining the effects of different spray adjuvants spray volume and nitrogen fertilizer applications Were also looking at tank mixes of mesotrione and amicarbazone Xonerate Arysta Research of other crops has shown that tank mixes of mesotrione and herbicides that inhibit photosynthesis the mode of action for amicarbazone are synergistic Bruce Branham Ph D is a professor Josh Skelton is a graduate student and Bill Sharp is a researcher in the department of crop sciences University of Illinois Branham can be reached at bbranham@ illinois edu REFERENCES Beaudegnies R A J Edmunds T E Fraser R G Hall T R Hawkes G Mitchell J Schaetzer S Wendeborn J Wibley 2009 Herbicidal 4 hydroxyphenylpyruvate dioxygenase inhibitors A review of the triketone chemistry story from a Syngenta perspective Bioorganic Medicinal Chem 17 4134 4152 Reicher Z D Weisenberger D Morton B Branham and W Sharp 2011 Fall applications of mesotrione for annual bluegrass control in kentucky bluegrass Appl Turfgrass Sci 25 March 2011 Results showed that several factors affected the level of annual bluegrass control from mesotrione 1 Publication Title Golfdom 2 Publication Number 1526 4270 3 Filing Date 9 19 2012 4 Issue Frequency Monthly 5 Number of Issues Published Annually 12 6 Annual Subscription Price Free to Qualified 7 Complete Mailing Address of Known Office of Publication Not Printer North Coast Media LLC 1360 E Ninth St Suite 1070 Cleveland OH 44114 Contact Person Antoinette Sanchez Perkins Telephone 216 706 3750 8 Complete Mailing Address of Headquarters or General Business Office of Publisher Not Printer North Coast Media LLC 1360 E Ninth St Suite 1070 Cleveland OH 44114 9 Full Names and Complete Mailing Addresses of Publisher Editor and Managing Editor Publisher Partrick Roberts North Coast 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