The Estimate app is a tool to assist the assessment of disease severity in plant pathology and other agricultural sciences.  Research scientists, crop consultants, and other professionals would use the application.  The framework provided by Estimate serves as a repository for standard area diagrams to enable users to accurately and precisely estimate plant disease severity. The application allows users to select a specific disease from a pre-populated list, specify either a logarithmic or linear categorical scale for estimating disease severity, and touch photographic images corresponding to the various percent categories for quantifying disease intensity within a pre-specified plot layout or experimental design.  Several options for data entry are included within the framework of the application, ranging from specification of plots and sub-plots to assessment of multiple, single sampling units with an undefined experimental design. The data are automatically saved as a spreadsheet within the application that can be emailed to a recipient at the end of the session as a csv file.

Further information on the Estimate app can be found in the Plant Disease Special Report publication.

Estimate is available for free download from the iTunes store to use on an iPad Air 2 and above ( The application is compatible with iOS 11 or greater.

Standard area diagrams currently available for use within Estimate are:

·         Cercospora leaf spot of table beet (red cultivars);

·         Cercospora leaf spot of table beet (yellow cultivars).

Estimate was developed by Sarah Pethybridge (Cornell University) and colleague, Scot Nelson (University of Hawaii at Manoa).


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