Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 28, 2006
Publication Date: February 6, 2007
Citation: Hanson, B.D. 2007. Herbicide Screening in Garden Rose Nursery. Weed Science Society of America Meeting Abstracts, February 5-8, 2007. Technical Abstract: The garden rose industry in the US, which is primarily located in California and Arizona, produces 35 million rose bushes annually for retail sale. Weed control in garden rose nurseries generally depends on preplant soil fumigation with methyl bromide, hand labor, and a few registered herbicides. The phaseout of methyl bromide, increasing labor costs, and recent shortages in the available labor force increases the need for alternative weed management. Trials were initiated in 2005-06 to screen several herbicides for efficacy and crop safety in newly planted hardwood rose cuttings. Preliminary results indicate several promising candidates for further research. These include PRE applied thiazopyr, and POST-directed applications of flumioxazin, rimsulfuron, and imazosulfuron. Several other compounds, including sulfentrazone, halosulfuron, penoxulam, foramsulfuron, carfentrazone, and lactofen may provide acceptable efficacy and safety with alterations in application rate, placement, or timing. Mesotrione, oxyflourfen, bromacil, and S-metolachlor did not have acceptable safety or efficacy at the rates tested. This research is ongoing and is being expanded to include other compounds and rose production techniques.