2002UC IPM on the World Wide Web
This year UC IPM added two models to the Interactive Tools and Models page, and both rely on data from the UC IPM weather database.
The new Web-based tomato powdery mildew model forecasts the need to spray a fungicide based on the risk of disease. Since tomato plants dont show symptoms of powdery mildew until about 2 weeks after infection, and no treatment is effective once symptoms are shown, the forecast gives a grower warning about the need to protect the crop.
To predict if damaging disease will develop within 2 weeks, the powdery mildew model determines if weather conditions have been right for mildew infection and calculates the risk of disease. Based on the disease risk, the model makes recommendations about the need to spray, taking into account whether the field is protected by fungicide applications. The model, based on research by UC Davis researchers Remigio Guzman Plazola and Mike Davis, uses weather data from the California Tomato Network or from a file supplied by the user.
The citrus thrips damage estimator has been validated only in Tulare County, California, but it provides a first step in developing a reliable prediction of citrus thrips damage in advance of when thrips would be treated, if needed. It estimates the degree of first scarring of navel oranges by citrus thrips, Scirtothrips citri, from weather data that accumulates prior to petal fall. Estimates for all UC IPM weather station locations in the San Joaquin citrus-growing areas are revised and posted daily during the first half of the year.
By posting the model on the site, authors Heinrich Schweizer and Joseph Morse, both UC Riverside entomologists, hope to collect feedback from citrus growers and pest control advisers who will compare its predictions to what they are seeing in the field. The model has not been fully tested and cannot be recommended for making treatment decisions at this time.
Since economic thresholds have been developed for individual aphid species, appropriate aphid management requires accurate identification. New interactive keys on the Web site will help you identify some aphid species commonly found in California alfalfa, cotton, small grains, corn, and sorghum. Users can readily navigate through the keys by clicking on the drawings, photos, or descriptions that best match the aphid in question. When the key identifies an aphid, a page with photos and links to management information from the UC Pest Management Guidelines is displayed.
The aphid keys, created with the assistance of UC Davis Entomologist Charles Summers, join the weed photo gallery and a key to eight species of ants in the Identification Helpers section of the Web site.
Find annual research reports from scientists funded through UC IPM grants programs in the projects databases under Research Results. Users may search by pest, crop or host, year, or investigator to find information on all of the projects that meet the criteria. The databases contain projects for both the UC IPM Research Grants Program and the Exotic Pests and Diseases Research Program. To ensure successful searches by avoiding spelling issues, each database provides lists from which the crop, pest, or investigator can be selected.
Average values for each day of the year for air temperature, rainfall, reference evapotranspiration, solar radiation, and soil temperature have been calculated for CIMIS stations with long records. The values are stored in the UC IPM weather database. From the Weather Data and Products section, users may view the averages, download them into a file, use them to fill in missing values for degree-days, calculate average degree-days over a season, or use them as a forecast of what might occur if future weather is "average."
The averages were calculated only for CIMIS stations that have at least 10 years of available data with few missing days. Also available are 30-year averages for more than 130 U. S. Department of Commerce/National Oceanic and Atmospheric Administration climate stations.
Now users can quickly find a weather station that reports the temperatures, rainfall, reference evapotranspiration, or other weather variables they need. The process for retrieving weather data from the UC IPM weather database has been revised to make it easier to find a station that has the data a user is looking for and to learn more about the characteristics of the station.
Under the new scheme, daily weather data and PestCast research data are
retrieved by the same process and more information is available for stations.
From the weather menu users may
From the list of stations that is displayed, users may