Amicarbazone Efficacy on Annual Bluegrass and Safety on Cool-Season Turfgrasses

Amicarbazone has potential for selective annual bluegrass control in cool-season turfgrasses, but seasonal application timings may influence efficacy. To test this hypothesis, field experiments in New Jersey and Indiana investigated amicarbazone efficacy from fall or spring applications and growth c...

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Bibliographic Details
Published in:Weed technology 2010-10, Vol.24 (4), p.461-470
Main Authors: McCullough, Patrick E, Hart, Stephen E, Weisenberger, Dan, Reicher, Zachary J
Format: Article
Language:English
Subjects:
adverse effects
Agrostis stolonifera
air temperature
amicarbazone
application timing
cool season grasses
Crop science
dry matter accumulation
Efficacy
Fertilizer application timing
Field experiments
grass weeds
herbicide
Herbicide resistance
Herbicides
injury
lawns and turf
Lolium perenne
nontarget organisms
Perennials
Phytotrons
plant damage
Plants
Poa annua
Poa pratensis
Surfactants
temperature effects
Turf grasses
weed control
WEED MANAGEMENT - OTHER CROPS/AREAS
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Summary:Amicarbazone has potential for selective annual bluegrass control in cool-season turfgrasses, but seasonal application timings may influence efficacy. To test this hypothesis, field experiments in New Jersey and Indiana investigated amicarbazone efficacy from fall or spring applications and growth chamber experiments investigated the influence of temperature on efficacy. Fall treatments were more injurious to creeping bentgrass and Kentucky bluegrass than spring applications, but fall applications were also more efficacious for annual bluegrass control. In growth chamber experiments, injury and clipping weight reductions were exacerbated by increased temperatures from 10 to 30 C on annual bluegrass, creeping bentgrass, Kentucky bluegrass, and perennial ryegrass. Results suggest that amicarbazone use for annual bluegrass control in cool-season turf may be limited to spring applications, but increased temperature enhances activity on all grasses. Nomenclature: Amicarbazone; annual bluegrass, Poa annua L.; creeping bentgrass, Agrostis stolonifera L. ‘L-93’; Kentucky bluegrass, Poa pratensis L. ‘Baron’, ‘Fairfax’, ‘Freedom’, ‘Merit’, ‘Midnight’, ‘SR2100’; perennial ryegrass, Lolium perenne L. ‘Manhattan IV’.
ISSN:0890-037X
1550-2740
DOI:10.1614/WT-D-10-00036.1