| About CODA | Citing CODA | Searching CODA | Information in CODA | Questions/Data submission |
Using the forms in the top window you can search for information on:
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See also A field guide to insects and diseases of California oaks, a field reference manual based on information found in CODA and other sources.
The CODA database and its access program were originally developed for the Forest and Rangeland Resource Assessment Program of the California Department of Forestry and Fire Protection. The original information in the database was compiled by Ted Swiecki and Elizabeth Bernhardt (Phytosphere Research) and Richard Arnold (Entomological Consulting Services, Ltd.), with database programming provided by Jim Kellogg (Tierra Data Systems). Elizabeth Bernhardt and Ted Swiecki have been responsible for all subsequent updating of the database as well as the database restructuring and programming involved in the creation of the web interface. Ginger Ogle (Digital Library Project, UC Berkeley) provided valuable assistance in inital efforts to convert CODA to a web application and support for using the CalPhotos image library to serve images compiled for CODA. Current funding for the web-based version of CODA is provided by USDA-Forest Service Region 5 and Phytosphere Research.
The following citation may be used to cite material listed in the CODA database:
Swiecki, T. J; Bernhardt, E. A.; Arnold, R.A. California oak disease and arthropod (CODA) database. [web application]. Phytosphere Research / USDA Forest Service / Digital Library Project, University of California, Berkeley. Available: http://phytosphere.com/coda [Accessed {insert access date}]
Current capabilities for searching the database online are organized in three bands in the top frame of the CODA webpage
Top band - Searching for agents by host and/or symptoms|
You can find agents that cause a specific symptom on a specific plant part on a given host (for example, locating all agents known to cause cankers on trunks of coast live oak). Leaving search fields blank allows you to do wildcard searches within those fields. For example, filling in only the symptom field will return records that list that symptom on any host or plant part. The drop-down box on the lower right of the top band allows you to view definitions of the symptoms described. Images illustrating the symptoms are planned but not currently implemented. |
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Three separate searches are available in this band. Find agents by scientific name allows you to search for agents by any part of their genus or species names. This search can also be used to find agents using outdated scientific names that are included as synonyms in CODA. View information on selected agent allows you to select a specific agent from a drop-down list. |
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You can search for the description of any of the tree hosts in the database either by typing in up to 7 characters of the common name or by using the species drop-down list. |
Due to the relational structure of the information in the CODA database, data are displayed in a series of hyperlinked screens. The various screens are described below.
Host-agent interaction screens: There are two different versions of this screen.
—Host-agent interaction by host lists all agents for a given host and is accessed by doing a search by host and/or symptoms. From this screen, two other screens are accessible, the Agent information and the Occurrence data screens.
— Host-agent interaction by agent lists all hosts colonized or affected by a given host and is accessed from the Agent information screen. From this screen, two other screens are accessible, the Host information and the Occurrence data screens.
Both screens describe the host-agent interaction, i.e., the symptoms associated with a given agent on a given host. Because some agents can cause types of symptoms on different hosts, damage symptoms are provided for each individual host-agent interaction. Data include host and agent names, plant parts affected and associated symptoms on each plant part, and the maturity of the affected plant part. This screen also notes whether the agent is a primary or secondary colonizer, and whether the symptom is a direct or indirect effect. For example, root decay is a direct effect of infection by root pathogens whereas wilting and dieback of the top are secondary effects.
Occurrence data screen: This includes available information on the geographic distribution of the agent within California and situations where it has been documented (wildland, urban, etc.). It lists the reference numbers of the original report(s) and related publications and includes a link to the Reference screen.
Reference screen: Lists the published and unpublished sources of the agent-host record, including author, year, title, and other notes. An alternate single record display of the data is available from this screen.
Agent information screen: Describes a given agent and is accessed by doing a search by agent. Includes functional and taxonomic classification, notes on geographic distribution, host range, life cycle, and damage caused. Other screens accessible from here are the Host-agent interaction and Agent synonym screens. From each agent description, links are provided to directly search the CalPhotos and Forestryimages.org image databases for digital images of the agents and their associated damage. We have been adding images to the CalPhotos database specifically for use with CODA and welcome submissions of images from other photographers.
Agent synonym screen. This screen provides a list of taxonomic synonyms for the current agent. This list primarily includes synonyms used in previous California reports and does not include all synonyms.
Host information screen: Describes a given host. Includes common names, plant characteristics, geographic range, and information on hybridization with other oaks. A links is provided to directly search the CalPhotos image databases for digital images of the host.
Symptom description screen: Describes the symptom terms used in the CODA Host-agent interaction screen and drop-down menu for searching by symptom. Example images of symptoms will be added in the future.