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Controlling Annual (Poa Annua) and Roughstalk Bluegrass (Poa Trivialis) in Cool Season Lawns with Methiozolin B

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Controlling Annual (Poa Annua) and Roughstalk Bluegrass (Poa Trivialis) in Cool Season Lawns with Methiozolin B Controlling Annual (Poa annua) and Roughstalk Bluegrass (Poa trivialis) in Cool Season Lawns with Methiozolin B. McNulty and S. Askew Virginia Tech Turfgrass Weed Science Outline About Annual and Roughstalk Bluegrasses Methiozolin (MRC-01) Objectives Methods and Materials Results Summary/Conclusion About the Species Annual and roughstalk bluegrasses are grassy weeds that commonly infest home lawns in the United States. Roughstalk can resemble annual, but has stolons and is a perennial Annual bluegrass is a prolific seed producer Methiozolin New herbicide developed and produced by the Moghu Research Center in South Korea. Isoxazoline class of chemistry Believed cell wall biosynthesis inhibitor Offers PRE and POST control of annual (and roughstalk??) bluegrass(es). (http://www.alanwood.net/pesticides/me thiozolin.html) Safe Registered in Korea, seeking US labeling Formulated as 25% EC Objectives Evaluate rates and programs of methiozolin for selective control of annual bluegrass and roughstalk bluegrass in cool season turfgrasses. Compare performance of MRC-01 to industry standard, bispyribac-sodium (Velocity). Trial Locations Three trials initiated at the Glade Rd. Research Facility in Blacksburg, VA. on April 19, 2010 First Site – Perennial ryegrass (PR) (Lolium perenne) infested with both bluegrasses and white clover (Trifolium repens) Second Site – Kentucky Bluegrass (KBG) (Poa pratensis) contaminated with white clover Third Site –Tall fescue (TF) (Festuca arundinacea) Methods and Materials Treatments replicated 3 times using RCBD Plot Size – 1m x 3m???????????? CO2 pressured backpack sprayer calibrated at 280 L/ha Methiozolin @ 500, 1000, 1500, 2000, 3000, and 4000 g ai/ha Bispyribac-sodium at 74 g ai/ha Non-treated check M2000- & Vel. 2x, 4WAIT Methods and Materials Ratings taken every 2 weeks at all trial locations Rated items at each location: PR – Cover/control of both bluegrasses and clover, seedhead, injury, cover PR KBG – Cover and injury KBG, clover control and cover TF – Cover and injury of TF Data subjected to Fisher’s Protected LSD, P=.05 Results Kentucky Bluegrass Injury 2WAIT 45 a 40 35 30 25 20 Percent Injury Percent 15 10 5 b b b b b b b 0 MRC 500g MRC 1000g MRC 1500g MRC 2000g MRC 3000g MRC 4000g Veloc. 74 g NTC LSD = 4.73 Velocity Injury on KBG 2WAIT Annual Bluegrass Seedhead Suppression 2WAIT a a 100 a 90 a 80 70 60 50 Suppression (%) 40 b b 30 20 Seedhead 10 c c 0 MRC 500g MRC 1000g MRC 1500g MRC 2000g MRC 3000g MRC 4000g Veloc. 74 g NTC LSD = 17.71 Seed-head Suppression 2WAIT White Clover Control 7 WAIT a 100 90 80 70 60 50 40 Percent Control Percent 30 20 10 b b b b b b b 0 MRC 500g MRC 1000g MRC 1500g MRC 2000g MRC 3000g MRC 4000g Veloc. 74 g NTC LSD = 2.23 Annual Bluegrass Control 8 WAIT a 100 a a 90 a 80 70 b 60 50 c 40 Percent Control Percent 30 20 d 10 d 0 MRC 500g MRC 1000g MRC 1500g MRC 2000g MRC 3000g MRC 4000g Veloc. 74 g NTC LSD = 20.44 Roughstalk Bluegrass Control 4WAIT 100 a a a 90 80 70 b 60 b 50 40 c Percent Control Percent 30 20 d 10 d 0 MRC 500g MRC 1000g MRC 1500g MRC 2000g MRC 3000g MRC 4000g Veloc. 74 g NTC LSD = 12.59 Summary MRC-01 is safe to all three turf types tested at all rates, but lacks control of white clover Bispyribac-sodium seriously injures KBG, but superior clover control MRC-01 provides better annual bluegrass control than bispyribac-sodium MRC-01 and bispyribac-sodium are equivalent in roughstalk bluegrass control Both MRC-01 and bispyribac-sodium provide excellent annual bluegrass seed-head suppression Questions?.
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