Preemergence Control of Annual Bluegrass (<i>Poa annua</i> L.)<sup>1</sup>

Goss, Roy L.

doi:10.2134/agronj1964.00021962005600050010x

Cited by 21 publications

(17 citation statements)

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“…Creeping bentgrass (CBG) is the cool-season turfgrass species of choice for golf course fairways and tees throughout the cool-humid region because it tolerates close mowing, remains green year-round, and possesses lateral stems that enable it to self-heal from divoting (1). Historically the most troublesome weed in CBG has been annual bluegrass (ABG) (12,13). This winter-annual is considered undesirable because of the unattractive yellow-green color and profuse seedhead production during the spring which disrupts turfgrass appearance and affects use (1).…”

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Monthly Flurprimidol Applications Reduce Annual Bluegrass Populations in a Creeping Bentgrass Fairway

Bigelow

Hardebeck

Bunnell³

2007

Applied Turfgrass Science

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Annual bluegrass (Poa annua L.) (ABG) is an invasive weed in creeping bentgrass (Agrostis stolonifera L.) (CBG) golf course fairways and tees. Plant growth regulators (PGRs) like flurprimidol (FL) are often applied to these areas to manage shoot growth and minimize ABG encroachment. This two‐year field study evaluated the effects of various FL, trinexepac‐ethyl (TE), and FL + TE tank‐mix combinations applied monthly from May through October to a mature CBG research fairway containing > 30% ABG prior to PGR initiation. After two consecutive years of PGR applications the most effective treatments for reducing ABG populations were FL alone (0.28, or 0.56 kg a.i./ha) or the FL + TE (0.56 + 0.06 kg a.i./ha) tank‐mix which reduced the ABG populations from initial levels by 78, 74, and 87% respectively. PGR effects on visual color and quality were not significant when averaged across both study years. These results demonstrate that even where rather large, > 30%, ABG populations exist, monthly FL applications throughout the growing season can gradually reduce ABG to tolerable, <10%, levels without the risk for rapid turf cover losses which can result in substantial turf voids.

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confidence: 99%

Monthly Flurprimidol Applications Reduce Annual Bluegrass Populations in a Creeping Bentgrass Fairway

Bigelow

Hardebeck

Bunnell³

2007

Applied Turfgrass Science

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“…Numerous studies (4,7,8,10,13) have been conducted with DCP A as a preemergence application for control of annual bluegrass (Poa annua L.). Acceptable annual bluegrass control was obtained in Alabama (13) and Virginia (4) but not in Georgia (8,10).…”

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“…Acceptable annual bluegrass control was obtained in Alabama (13) and Virginia (4) but not in Georgia (8,10). Gross (7) reported that DCP A would give good preemergence annual bluegrass control if applications were made to coincide with seed germination. However, in Georgia (8), annual bluegrass control was poor when DCPA treatments were applied during a period from July to October in each of 3 years at Griffin and I of 2 years at Lawrenceville (8).…”

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Sequential DCPA Treatments for Weed Control in Turfgrasses¹

Johnson¹

1977

Agronomy Journal

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In the southeastern USA, herbicides have not generally given consistent preemergence control of large crabgrass [Digitaria sanguinalis (L.) Scop.] and annual bluegrass (Poa annua L.). DCPA (dimethyl tetrachloroterephthalate) was applied as single and repeated treatments over a 3‐year period for large crabgrass control at Griffin and Blairsville, Georgia, and for annual bluegrass control at Griffin. The soil types were Cecil sandy loam (Typic Hapludult) or sandy clay loam at Griffin and Hatboro loam (Typic Fluvaquents) or sandy loam at Blairsville. None of the DCPA treatments controlled large crabgrass or annual bluegrass consistently at the, rates included in these studies. Treating plots with DCPA at 11.2 kg/ha in both March and June gave the greatest control in 2 of 3 years at each location. A significant multiple correlation between temperature prior to treatment and weed control ratings indicated that poor control of large crabgrass was related to germination of crabgrass prior to treatment. High temperatures that induced germination of crabgrass during 2 weeks prior to time of treatment resulted in less control than in years with lower temperatures. This emphasizes the need for early application of DCPA in Georgia.

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“…The tolerance of seedling Kentucky bluegrass to linuron [3-(3,4-dichlorophenyl) Annual bluegrass is a major weed problem on golfcourses, particularly in areas subject to excessive irrigation, wear and/or soil compaction (Juska and Hanson 1967;Perkins 1974). Chemical control has been attempted but selectivity has generally not been acceptable (Engel and Callahan 1967;Goss 1964 Kentucky bluegrass and a stand of Victa Kentucky bluegrass were tolerant to linuron (G) at rates from 3.4 to 6.7 kglha (Table 2).…”

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confidence: 99%