SHRE Proposals funded for 2016-2017
Increasing the potential regional invasive predictability of the Plant Risk Evaluation (PRE) tool for ornamentals in California by incorporating climatic matching data
Joseph M. DiTomaso, UC Davis Dept. of Plant Sciences
We developed and published a Plant Risk Evaluation (PRE) tool for evaluating ornamental plants in California. The tool uses a systematic process relying on available scientific evidence to estimate the potential risk of an ornamental plant becoming invasive and causing environmental or economic harm in the state. This tool includes 20 questions statistically evaluated to provide separation power between known invasive and non-invasive species and a proven accuracy level
of 100% for both predicting invasiveness and non-invasiveness in a validation study. Currently, the nursery industry in California is enthusiastic about employing the PRE tool and we are currently screening plants on the WUCOLS IV list to identify species having the highest potential for escape and invasiveness. Results of this project identified about 40 species that resulted in a reject outcome through the PRE model. Our objective in this proposal is to use the climate matching software (CLIMEX) to increase the geographic predictability of the PRE tool
in California. The model can make predictive maps of potential invasive range and also of suitable climate for propagation in California. Adding this regional resolution will allow us to better predict where a plant may be the greatest threat to escape cultivation in California.
Developing irrigation Guidelines for the Establishment of CA Native Plants - Year 2
Karrie Reid, UCCE San Joaquin County
David W. Fujino, Ph.D., California Center for Urban Horticulture, UC Davis
Loren R. Oki, Ph.D., UCCE, Dept. of Plant Sciences, UC Davis
Jared Sisneroz, Dept. of Plant Sciences, UC Davis
This trial will attempt to develop best irrigation management practices for the establishment of five widely available California native plant species that have a high incidence of first-year mortality in landscape applications. The trial will be replicated at two sites with distinctly different soil types: fine sandy loam and clay loam. Irrigation will be applied at 25%, 50%, 75%, and 100% of maximum allowable depletion (MAD) for each soil type, determined by a water budget using local California Irrigation Management System (CIMIS) data. Mortality rates, plant stress and growth measurements, and health and appearance ratings across treatment levels will be used to develop recommendations for irrigation practices during establishment of these species in the landscape.
Planting the New CA Garden
Carol Moholt, Pacific Horticulture Society
Lorene Edwards Forkner, editor
A shifting climate and diminishing water resources challenge California
gardeners. Extended drought conditions and a growing awareness of the benefits of cooperating with natural systems, including the support of beneficial native insects and pollinators, mean appropriate plant selections are more critical than ever to the resiliency of a landscape and a gardener’s eventual success.
The goal of this project is to use Pacific Horticulture’s publishing platform – in print and online – to illustrate information found in the WUCOLS database within a framework of beautifully designed gardens. We propose a 2--page spread featuring gardens designed by APLD professionals, one in each issue of Pacific Horticulture magazine in 2017. Each issue will profile a finished landscape from various regions throughout the state. Plants in the design will be identified and formatted into a table illustrating WUCOLS water use data with regional variables, In addition to showing water--wise plants in a garden context during 2017,
the series will commence with a background story about the WUCOLS project in fall 2016.