Knowledge Core Collection:https://hdl.handle.net/11681/467612024-03-29T11:56:18Z2024-03-29T11:56:18ZUnmanned aircraft systems and tracer dyes : potential for monitoring herbicide spray distributionMudge, Christopher R.Suir, Glenn M.Sperry, Benjamin P.https://hdl.handle.net/11681/477052023-11-02T13:13:55Z2023-09-01T00:00:00ZTitle: Unmanned aircraft systems and tracer dyes : potential for monitoring herbicide spray distribution
Authors: Mudge, Christopher R.; Suir, Glenn M.; Sperry, Benjamin P.
Abstract: Chemical control of nuisance aquatic vegetation has long been the most widely utilized management tool due to its high level of efficacy, limited environmental impacts, and relatively low cost. However, unprecise application of herbicides can lead to uncontrolled invasive plants and unintended management costs. Therefore, precision herbicide delivery techniques are being developed to improve invasive plant control and minimize impacts to non-target plants. These technological advancements have the potential to enhance aquatic ecosystem protection from invasive species while reducing associated management costs. Despite the benefits of using registered herbicides for aquatic plant control in efforts to restore aquatic habitats, their use is often misunderstood and opposed by public stakeholders. This can lead to significant challenges related to chemical control of nuisance aquatic vegetation. Thus, US Army Corps of Engineers (USACE) Districts seek improved methods to monitor and quantify the distribution (i.e., amount of herbicide retained on plant foliage compared to those deposited into the water column) of herbicides applied in aquatic systems. Monitoring herbicide movement in aquatic systems can be tedious and costly using standard analytical methods. However, since the inert fluorescent tracer dye Rhodamine WT (RWT) closely mimics product movement in the aquatic environment it has been used as a cost-effective surrogate for herbicides tracing. The use of RWT (or other inert tracer dyes) can be an efficient way to quantify herbicide retention and deposition following foliar treatments. However, the collection of operational spray deposition data in large populations of invasive floating and emergent plant stands is labor intensive and costly. One proposed solution is the use of remote sensing methods as an alternative to traditional in situ samples. Specifically, using unmanned aircraft systems (UAS) in conjunction with RWT could provide more efficient monitoring and quantification of herbicide spray distribution and in-water concentrations when using RWT in combination with herbicides. A better understanding of UAS capabilities and limitations is key as this technology is being explored for improved and integrated management of aquatic plants in the U.S. This technical note (TN) provides a review of literature to assess the state of knowledge and technologies that can assist USACE Districts and partners with tracking herbicide movement (using RWT as a surrogate or additive), which could improve operational monitoring, thus reducing the level of uncertainty related to chemical applications and non-target impacts, and thus improve management in aquatic systems.
Description: Technical Note2023-09-01T00:00:00ZInvestigating Minimum Exposure Time Requirements of Diquat for Flowering Rush (Butomus umbellatus) ControlSartain, Bradley T.Getsinger, Kurt D.https://hdl.handle.net/11681/471412024-03-22T18:34:25Z2023-06-01T00:00:00ZTitle: Investigating Minimum Exposure Time Requirements of Diquat for Flowering Rush (Butomus umbellatus) Control
Authors: Sartain, Bradley T.; Getsinger, Kurt D.
Abstract: The purpose of this study was to investigate the minimum exposure time requirements for submersed treatments of diquat to effectively control flowering rush (Butomus umbellatus L.). Identifying these parameters will provide critical information for the operational management of this species in high water exchange scenarios.
Description: Technical Note2023-06-01T00:00:00ZGrowth assessments of starry stonewort (Nitellopsis obtusa) in various substrate types for large-scale cultivation studiesPokrzywinski, Kaytee L.Grasso, Christopher R.Sartain, Bradley T.Fernando, Brianna M.Volk, Kaitlinhttps://hdl.handle.net/11681/444032023-11-02T13:22:53Z2022-05-01T00:00:00ZTitle: Growth assessments of starry stonewort (Nitellopsis obtusa) in various substrate types for large-scale cultivation studies
Authors: Pokrzywinski, Kaytee L.; Grasso, Christopher R.; Sartain, Bradley T.; Fernando, Brianna M.; Volk, Kaitlin
Abstract: The purpose of this study was to compare multiple substrate types to optimize cultivation conditions for the invasive macroalga Nitellopsis obtusa (Desv. in Loisel.) J. Groves, commonly known as starry stonewort. Large-scale cultivation will allow for tiered approaches to management evaluation research while minimizing the influence of confounding variables.
Description: Technical Note2022-05-01T00:00:00ZEvaluating drone truthing as an alternative to ground truthing : an example with wetland plant identificationSuir, Glenn M.Saltus, Christina L.Reif, Molly K.Sasser, Charles E. (Charles Edward), 1950-Harris, J. MasonDiaz, RodrigoGiffin, Gabehttps://hdl.handle.net/11681/422012023-11-02T14:28:46Z2021-09-01T00:00:00ZTitle: Evaluating drone truthing as an alternative to ground truthing : an example with wetland plant identification
Authors: Suir, Glenn M.; Saltus, Christina L.; Reif, Molly K.; Sasser, Charles E. (Charles Edward), 1950-; Harris, J. Mason; Diaz, Rodrigo; Giffin, Gabe
Abstract: Satellite remote sensing of wetlands provides many advantages to traditional monitoring and mapping methods. However, remote sensing often remains reliant on labor- and resource- intensive ground truth data for wetland vegetation identification through image classification training and accuracy assessments. Therefore, this study sought to evaluate the use of unmanned aircraft system (UAS) data as an alternative or supplement to traditional ground truthing techniques in support of remote sensing for identifying and mapping wetland vegetation.
Description: Technical Note2021-09-01T00:00:00Z