Skip to main content
ARS Home » Pacific West Area » Albany, California » Western Regional Research Center » Exotic and Invasive Weeds Research » Research » Research Project #418618


Location: Exotic and Invasive Weeds Research

2011 Annual Report

1a. Objectives (from AD-416)
1. Complete statistical analysis on yellow starthistle field study. 2. Complete computer model parameterization. 3. Complete journal articles on joint research.

1b. Approach (from AD-416)
1. Field data collected during 2007 and 2008 will be statistically evaluated and summary graphics prepared. 2. Statistically significant biological parameters will be developed and incorporated into an existing hermes model of yellow starthistle growth. 3. Both field data on yellow starthistle growth and model development and application will be published in peer reviewed journals. Documents Grant with UC Santa Cruz. Formerly 5325-22000-020-41G(1/11).

3. Progress Report
The ADODR oversaw the project through direct communication with the Cooperating principal investigator (PI) as that individual was housed in USDA-ARS laboratory facilities at the Western Regional Research Center. Weekly or more frequent interactions between the ADODR and the cooperator occurred via laboratory visits, email communications and telephone contact. ARS and cooperating UC personnel made frequent joint visits to various field locations, to conduct joint yellow starthistle research. Research was completed on a field assessment of yellow starthistle growth studies under natural and controlled environmental conditions. Plant parameters depicting biomass, leaf structure, flowering and reproductive potential were measured under various abiotic conditions. Measures of photosynthetic active radiation (PAR) were made as inputs into plant growth models and an empirical process was developed to predict PAR across wide areas using more commonly measured abiotic conditions. These attributes are now being incorporated into a predictive model to simulate yellow starthistle growth and invasion of spatially explicit watersheds in California to help develop new weed management strategies.

4. Accomplishments