Abstract
Abstract Effectiveness of five preemergence herbicides was determined for four container-grown ornamental crops. Herbicides tested were Barricade (prodiamine); BroadStar (flumioxazin); Gallery (isoxaben); Scotts Ornamental Weedgrass Control (Scotts OWC) (pendimethalin); and Treflan (trifluralin). Four herbaceous plant species were utilized in this trial, namely, Guizhou sage (Artemisia lactiflora Wall. (Guizhou group)); hopflower oregano (Origanum libanoticum Boiss.); Daghestan sage (Salvia daghestanica Sosn.); and skullcap (Scutellaria resinosa Torr.). The seven weed species evaluated in this trial were annual bluegrass (Poa annua L.); barnyardgrass (Echinochloa crus-galli L.); yellow foxtail grass (Setaria glauca L.); purslane (Portulaca oleracea L.); common groundsel (Senecio vulgaris L.); redroot pigweed (Amaranthus retroflexus L.); and annual sowthistle (Sonchus oleraceus L.). Two controls, one with weeds and one without were also evaluated. The experiment was conducted in two locations: Fort Collins and Grand Junction, Colorado. Weed control levels varied across a range of herbicide treatments and ornamental species. Where differences among herbicides were observed, BroadStar and Treflan tended to be more effective than the other herbicides, while Gallery, Scotts OWC and Barricade, were less effective. Plants treated with Gallery often resulted in decreased dry weights; however, no visual phytotoxicity symptoms were observed with any herbicide treatments. Daghestan sage and skullcap were the crop species most adversely effected.
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