Introduction

This app estimates cherry powdery mildew infection risk. You choose a place and date, and the uspest.org server looks up the weather data and runs the risk model. This app then shows you the risk index values classified into risk categories. You can use these categories to adjust management actions, such as intensity of scouting, fungicide selection and fungicide application intervals.

• The model used by this app is experimental. Use with caution.
• The model only addresses the conidial stage of the disease.

This app is a newer, streamlined interface for the existing model, which is also available through MyPest Page.

Disease Information

Cherry Powdery Mildew (from Pacific Northwest Plant Disease Management Handbook).

Using this App

Select the "Inputs" tab, search for weather stations near you, and choose one either from a list or a map. Be aware that some weather stations have poor quality or missing data. Our software estimates the quality of each station, but you may wish compare results for several nearby stations.

Optionally, you may choose a start date and a span (number) of days. If you leave the start date blank, the end of the output will be five days in the future, using forecast weather data, and the app will count back to a start date in the recent past. The weather forecast data is from the National Weather Service's "NDFD" forecasts.

Then, select "Graph" or "Table" to run the model. Your output will appear after 10-20 seconds depending on server load.

About the Risk Index

This is an experimental model, and documentation is not available. The limited information we have is on our disease risk model documentation page.

This model is intended to predict risk from the conidial stage of the disease only.

Disclaimer: The index is intended to inform your decisions about management actions, such as choice and timing of control measures and intensity of scouting. It should supplement, not replace, the other factors you consider in making these decisions. Use at your own risk.

Email Subscription

Automated email delivery of the disease risk index outputs displayed in this app is available at no cost. An email subscription offers model results for this and several other plant disease models, for up to three weather stations, on a schedule that you select. To subscribe, you will need a uspest.org account.

Acknowledgements

• This app was funded in part by the USDA National Institute of Food and Agriculture, Crop Protection, and Pest Management, Extension Implementation Program (USDA-NIFA-CPPM-EIP).
• Dan Upper provided programming for the project.
• Location search uses data © OpenStreetMap contributors and data from MaxMind.