This project was a collaboration between Dr. Janna Beckerman (Department of Botany and Plant Pathology) and Dr. Cliff Sadof (Department of Entomology), who contributed equally to this work.

The database and processes that drive this website were written by David McClure of Purdue's Center for Environmental and Regulatory Information Systems (CERIS)

Unless otherwise mentioned, photos were taken by J. Beckerman, John Obermeyer, C. Sadof, or were collected from digital submissions to the Plant and Pest Diagnostic Laboratory from Extension Educators and other residents of Indiana. 

Other photos were obtained with permission from the database. 

Lists of host plants attacked by specific pathogens and pests were obtained from samples collected over from 1990 to 2022 at the Purdue Plant and Pest Diagnostic Laboratory and:

Farr, D.F., & Rossman, A.Y. Fungal Databases, U.S. National Fungus Collections, ARS, USDA. Retrieved July 19, 2022, from

Cranshaw W., and Shetlar D. 2018. Garden Insects of North America,

Lists of Look Alikes were generated from Beckerman and Sadof’s 3 decades of experience of problem diagnosis as Extension Specialists.

This work is supported by the Departments of Botany and Plant Pathology at Purdue University and Extension Implementation Grant 2021-70006-35390 / IND90001518G-1027053 from the USDA National Institute of Food and Agriculture.