Management of Ventenata dubia in the Inland Pacific Northwest with Indaziflam

Lindsay Elizabeth Koby

Ventenata dubia (Leers) Coss, an invasive annual grass in Eastern Washington and Northern Idaho, is a direct threat to non-cropland of the Palouse. Direct threats to native prairie and thousands of acres of conservation reserve program (CRP) arise in the form of invasive species like ventenata and require active management. Two CRP sites near Moscow, ID and Pullman, WA were chosen to evaluate indaziflam as a potential management option for ventenata over two years. Results indicate that indaziflam applied with rimsulfuron or glyphosate may be a potential management tool of ventenata in perennial grass stands. Visual assessment and biomass data from 2016 and 2017 validated the hypothesis that indaziflam plus tank mix partners effectively control ventenata while having minimal impacts on desirable vegetation. Total mean biomass of perennial bunchgrasses did not decline with treatments that effectively reduce the mean biomass of ventenata. Successful and sustained ventenata control leading to perennial bunchgrass recovery provides further incentive to integrate indaziflam in combination with either glyphosate or rimsulfuron into a management regiment. The results of these field trials identify the potential of indaziflam as a new tool for control of ventenata invasions while minimally impacting desired vegetation. Chemical efficacy, uptake and translocation studies were performed on smooth scouringrush (Equisetum laevigatum A. Braun). Smooth scouringrush is an increasing problem in dryland production agriculture. It is also a difficult weed to control. Surfactants and herbicides were evaluated for control during greenhouse trials. Results from greenhouse trials lead to a 14 C uptake and translocation experiment using metsulfuron, nonionic surfactant (NIS) and basal bark oil (BBO) A computer-based seedling identification program was also produced in collaboration with Rich Old and XID © services. XID broadleaves identification program uses the selection and elimination of attributes to identify weeds to the species level. The program was used as a template with the weeds list reduced to weeds common in dryland production. Weed seeds from the list were collected, grown, measured and photographed to add to the XID attribute list to identify weeds at the cotyledon and first true leaf growth stage.

Management of Ventenata dubia in the Inland Pacific Northwest with Indaziflam

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