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Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/6374
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dc.contributor.authorNelson, Linda S.en_US
dc.contributor.authorNetherland, Michael D.en_US
dc.creatorAquatic Plant Control Research Program (U.S.)en_US
dc.creatorEnvironmental Laboratory (U.S.)en_US
dc.date.accessioned2016-03-23T19:55:07Zen_US
dc.date.available2016-03-23T19:55:07Zen_US
dc.date.issued1993-01en_US
dc.identifier.govdocTechnical Report A-93-2en_US
dc.identifier.urihttp://hdl.handle.net/11681/6374en_US
dc.descriptionTechnical Reporten_US
dc.description.abstractStudies to evaluate the efficacy of bensulfuron methyl on Eurasian watermilfoil (Myriophyllum spicatum L.) were conducted in a 55-l aquaria system under controlled-environment conditions. Forty-two bensulfuron methyl concentration and exposure time combinations were tested: concentrations ranged from 0 to 4,600 μg/l; exposure times ranged from 7 to 49 days . Chemical effectiveness was based on shoot and root biomass harvested at the conclusion of each experiment. Visual injury ratings were recorded weekly to characterize chemical activity. Herbicide injury was evident 1 week after application on all treatments and included one or more of the following symptoms: leaf chlorosis, deformed leaves on shoot tips, downward bending of leaves at upper nodes, stem necrosis, and formation of axillary buds. Following a 7-, 14-, 21-, 28-, 35-, 42-, and 49-day exposure period at concentrations ranging from 10 to 4,600 μg/l, plant biomass was reduced 10 to 90 percent compared with untreated plants. Increasing exposure time was more efficacious than increasing bensulfuron methyl concentration. Younger milfoil plants (7 days old) were also susceptible to bensulfuron methyl application than plants that were allowed a 3-week pretreatment growth period. Bensulfuron methyl concentrations <10 μg/l did not significantly reduce milfoil growth. Effects on roots were variable depending on concentration and plant age. Only treatments of 230 μg/l and higher inhibited root growth on plants grown for 3 weeks prior to treatment, whereas 50 μg/l was sufficient to reduce root growth of younger plants. Regrowth was observed on all treatments, indicating the potential for plant recovery. Regrowth emerged from rootcrowns, axillary buds, and injured shoot apices and was evident 1 to 2 weeks following completion of the exposure period and removal of the bensulfuron-methyl-treated water. Complete plant control (plant death) was not achieved at the concentrations and exposure times tested in these studies.en_US
dc.description.sponsorshipAquatic Plant Control Research Program (U.S.)en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineersen_US
dc.description.tableofcontentsPreface..................................1 Introduction..................................3 Materials and Methods..................................6 Studies 1 and 2..................................7 Study 3..................................9 Study 4..................................9 Results and Discussion..................................10 Study 1..................................10 Study 2..................................13 Study 3..................................16 Study 4..................................18 Conclusions..................................20 Recommendations..................................21 References..................................22en_US
dc.format.extent28 pages/5.88 MBen_US
dc.format.mediumPDFen_US
dc.language.isoen_USen_US
dc.publisherU.S. Army Engineer Waterways Experiment Stationen_US
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1043532en_US
dc.relation.ispartofseriesTechnical Report (Aquatic Plant Control Research Program (U.S.)) ; no.Technical Report A-93-2en_US
dc.rightsApproved for public release; distribution is unlimiteden_US
dc.sourceThis Digital Resource was created from scans of the Print Resourceen_US
dc.subjectBensulfuron methylen_US
dc.subjectBiomassen_US
dc.subjectEurasian watermilfoilen_US
dc.subjectAquatic plantsen_US
dc.subjectAquatic vegetationen_US
dc.subjectAquatic plant controlen_US
dc.subjectExposure timeen_US
dc.subjectHerbicideen_US
dc.subjectEvaluationen_US
dc.subjectSulfonylureaen_US
dc.subjectAquatic Plant Control Research Program (U.S.)en_US
dc.titleEfficacy of bensulfuron methyl on eurasian watermilfoilen_US
dc.typeReporten_US
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