manage invasive species, such as GWSS and others that could emerge as PD vectors, could become more significant in the years ahead. This is classified as Category 2 research.

Significant progress already has been made in elucidating the biology of the PD–GWSS problem. Plausible management strategies have been tested and either advanced to future studies or eliminated. However, there still are significant knowledge gaps in critical areas. This report identifies those gaps, provides guidance for setting priorities in the research needed to fill them, and describes mechanisms for improving funding and management. Areas that could benefit from research include economic feasibility; the biology of interactions among GWSS, Xf, and host plants; and various management strategies, including those that involve host plant resistance and biological and chemical controls. This and other reports, including those published by USDA’s Agricultural Research Service and the American Vineyard Foundation, provide stakeholders with guidance to take on the remaining challenges in managing the PD–GWSS problem.

This report was developed early in the process of elucidating the mechanisms of GWSS–Xf–host interaction and early in the process of setting priorities for funding research. As new data emerge and as approaches and priorities are refined, research and management strategies will be adjusted. The process that has developed through this study can serve as a template for other emerging pest–pathogen problems not only in California, but in agricultural ecosystems in general.

2.1 To ensure scientific rigor and enhance the coordination of the PD–GWSS research program, participating research sponsors should consolidate the processes for proposal solicitation and review.

2.2 Research priorities should be developed according to their ability to meet two criteria: the predicted ability of the approach to contribute to PD–GWSS management and its sustainability. The committee recommends a balance among short-, medium-, and long-term research projects to ensure the development of sustainable management approaches are achieved.

2.3 An economic analysis including a study of environmental impacts should be conducted for all potential management strategies and outcomes (Category 1).

Front Matter (R1-R16)

Executive Summary (1-20)

1 Pierce's Disease and the Glassy-winged Sharpshooter: Their Biology and the Challenges of Their Management (21-44)

2 Developing Priorities for Research (45-54)

3 Host-Vector Interaction (55-87)

4 Plant-Pathogen Interaction (88-104)

5 Vector-Pathogen Interaction (105-113)

6 References (114-152)

Appendix A: Committee Biographies (153-157)

BANR Publications (158-161)