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Colusa Subreach Planning Pest and Regulatory Effects Study Final Project Report

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Colusa Subreach Planning Pest and Regulatory Effects Study Final Project Report Colusa Subreach Planning Pest and Regulatory Effects Study Final Project Report January 2008 Colusa Subreach Planning Pest and Regulatory Effects Study Final Project Report Submitted to: Colusa Subreach Planning Advisory Workgroup and The Nature Conservancy 500 Main Street Chico, CA 95928 Contact: Greg Golet, Senior Ecologist 530/897-6370 Prepared by: EDAW 2022 J Street Sacramento, CA 95811 Contact: Ron Unger 916/414-5800 January 2008 05110133.01 01.30.08 TABLE OF CONTENTS Section Page ACRONYMS AND ABBREVIATIONS................................................................................................................iv EXECUTIVE SUMMARY ............................................................................................................................... ES-1 Background and Purpose of the Study........................................................................................................ES-1 Key Regulatory Findings............................................................................................................................ES-2 Key Pest Findings.......................................................................................................................................ES-5 Recommendations.....................................................................................................................................ES-11 Conclusions ..............................................................................................................................................ES-13 1 INTRODUCTION ...................................................................................................................................... 1-1 1.1 Background and Purpose of the Study................................................................................................ 1-1 1.2 Study Objectives and Design............................................................................................................ 1-15 2 REGULATORY CONSTRAINTS............................................................................................................ 2-1 2.1 Environmental laws and Regulations Relevant to Agriculture and Habitat Restoration in the Study Area .......................................................................................................................................... 2-1 2.2 Sensitive Biological Resources in the Study Area............................................................................ 2-12 3 REGULATORY SOLUTIONS ................................................................................................................. 3-1 3.1 Omitted Regulatory Solutions............................................................................................................. 3-2 3.2 Restoration Design Solutions.............................................................................................................. 3-3 3.3 Regulatory Agreement Solutions........................................................................................................ 3-7 3.4 Overall Evaluation of Potential Regulatory Solutions...................................................................... 3-17 3.5 Regulatory Solution Conclusions ..................................................................................................... 3-17 3.6 Regulatory Solution Recommendations............................................................................................ 3-19 4 AGRICULTURAL PEST EFFECTS AND CONVENTIONAL CONTROL MEASURES................ 4-1 4.1 Pest Effects on Agriculture in the Colusa Subreach ........................................................................... 4-1 4.2 Potential Pest Effect Changes from Riparian Habitat Restoration, and Conventional Control Measures ......................................................................................................... 4-5 4.3 Conclusions on Pest Species Effects................................................................................................. 4-38 5 PEST SOLUTIONS.................................................................................................................................... 5-1 5.1 Pest Prevention................................................................................................................................... 5-1 5.2 Pest Abatement ................................................................................................................................... 5-5 5.3 Coordination with Neighboring Property Owners.............................................................................. 5-6 5.4 Evaluation of Potential Pest Solutions................................................................................................ 5-7 5.5 Potential Pest Solutions Conclusions.................................................................................................. 5-9 5.6 Pest Solutions Recommendations ..................................................................................................... 5-10 6 DOCUMENT PREPARERS...................................................................................................................... 6-1 7 REFERENCES ........................................................................................................................................... 7-1 Colusa Subreach Planning EDAW The Nature Conservancy i Table of Contents TABLES 1-1 Land Use between the Flood Control Levees of the Colusa Subreach .................................................. 1-2 1-2 Proposed Restoration Sites..................................................................................................................... 1-5 1-3 Proposed Riparian Habitat Types........................................................................................................... 1-5 1-4 Proposed Restoration Tract Sizes and Adjoining Land Use Types...................................................... 1-14 2-1 Endangered, Threatened, and Fully Protected Species with Potential to Occur in the Study Area ..... 2-16 2-2 Potential for Increased Agricultural Regulatory Constraints Associated with Endangered, Threatened, and Fully Protected Species and Riparian Habitat Restoration in the Study Area........... 2-33 3-1 Evaluation of Habitat Type Configuration as a Solution to Increased Regulatory Constraints in the Colusa Subreach............................................................................................................................... 3-4 3-2 Evaluation of Planting Protocols as a Solution to Increased Regulatory Constraints in the Colusa Subreach..................................................................................................................................... 3-5 3-3 Evaluation of Buffer Zones as a Solution to Increased Regulatory Constraints in the Colusa Subreach................................................................................................................................................. 3-7 3-4 Evaluation of Delisting the Valley Elderberry Longhorn Beetle as a Solution to Increased Regulatory Constraints in the Colusa Subreach..................................................................................... 3-8 3-5 Evaluation of Good Neighbor Policy as a Solution to Increased Regulatory Constraints in the Colusa Subreach................................................................................................................................... 3-10 3-6 Evaluation of an HCP as a Solution to Increased Regulatory Constraints in the Colusa Subreach..... 3-12 3-7 Evaluation of MOA/MOUs as a Solution to Increased Regulatory Constraints in the Colusa Subreach............................................................................................................................................... 3-14 3-8 Evaluation of PSHAs under Various Scenarios as a Solution to Increased Regulatory Constraints in the Colusa Subreach ..................................................................................................... 3-16 3-9 Evaluation and Comparison of Solutions to Increased Regulatory Constraints in the Colusa Subreach............................................................................................................................................... 3-18 4-1 Crops Grown in the Colusa Subreach: Priority for Analysis ................................................................. 4-1 4-2 Potential Pest Effects on Agriculture in the Colusa Subreach ............................................................... 4-2 4-3 Host Plant Associations of Pest Insects in the Study Area................................................................... 4-11 4-4 Potential Effects of Restoration on Agricultural Pest Populations....................................................... 4-29 4-5 Summary of Potential Pest Effect Changes on Agriculture Following Riparian Restoration.............. 4-38 5-1 Overall Evaluations of Various Solutions to Increased Pest Damage in the Colusa Subreach.............. 5-8 EDAW Colusa Subreach Planning Table of Contents ii The Nature Conservancy EXHIBITS 1-1 Proposed Habitat Restoration Tracts ..................................................................................................... 1-3 1-2 Land Use in the Colusa Subreach .......................................................................................................... 1-4 1-3 Princeton Southeast (Womble tract) and Jensen Restoration Area Boundary Types ...........................
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