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Gail E. Ruhl

Botany and Plant Pathology 

  • Senior Plant Disease Diagnostician

Awards & Honors

(2015) 35 Years of Service. Purdue University.

(2013) 2013 Purdue Agriculture TEAM Award. Purdue College of Agriculture.

(2013) ASA Extension Excellence award for a digital decision aid. American Society of Agronomy (ASA).

(2013) Midwest Regional Turf Foundation Award of Achievement. Midwest Regional Turf Foundation.

(2012) 2012 PUCESA Team Award: Imprelis Herbicide Injury Response Team. Purdue University Cooperative Extension Specialists Associaton (PUCESA).

(2012) APS Excellence in Extension Award. American Phytopathological Society (APS).

(2010) 30 Years Service to Purdue. Provost Recognition Luncheon.

(2010) Managing Moldy Corn Extension Team. 2010 PUCESA Team Award.

(2009) Outstanding Service in Global Relations. Epsilon Sigma Phi ; Alpha Lambda Chapter;ESP Globalization Committee.

(2005) Soybean Rust Team Award. PUCESA.

Selected Publications

Rivera, Y., Creswell, T. C., Ruhl, G., & Crouch, J. A. (n.d.). First report of Downy Mildew caused by Plasmopara halstedii on the native Rudbeckia fulgida Aiton var. speciosa (Wender.) in Indiana. Manuscript in preparation.

Egel, D., Hoke, S., Dicklow, M., & Wick, R. (2010). First Report of Black Leg of Hydroponic Basil in the United States Caused by Plectosporium tabacinum. Plant Disease, 94(4), 484.2 - 484.2. Retrieved from

Wise, K., Creswell, T., Leonberger, A., & Speers, C. (2009). First Report of Goss's Bacterial Wilt and Leaf Blight on Corn Caused by Clavibacter michiganensis subsp. nebraskensis in Indiana. Plant Disease, 93(8), 841. doi: 10.1094/PDIS-93-8-0841B

Beckerman, J., & Ruhl, G. (2007). Phytophthora citricola causes a canker on Walnut. Plant Health Progress.

Crime Scene Investigation (CSI) with Powdery Mildew Fungi. (2004). The Plant Health Instructor, 1. doi: 10.1094/PHI-k-2004-0330-02

Ruhl, G. (2003). Fusicladium levieri, a fungal parasite of persimmon, found in Indiana. Proceedings of the Indiana Academy of Science, 112(2), 132-134.

Ruhl, G., & Whitford, G. (2002). Educating your customer clientele:A holistic approach to pest management. In The Complete Book on Pesticide Management: Science, Regulation, Stewardship and Communication (787). New York: Wiley and Sons.

Ruhl, G., & Jasalavich, C. (2002). Powdery Mildew Fungi:Classification and Ecology. The Plant Health Instructor, DOI:10.1094/PHI-K-2002-0125-01. Retrieved from

Ruhl, G. (2002). Resources for Identifying Orchid Ailments. In A Guide to Orchid Pests and Diseases (111-118). Florida: American Orchid Society.

Holmes, G., & Brown, E. (2000). What's a Picture Worth? The Use of Modern Telecommunications in Diagnosing Plant Diseases. Plant Disease, 84(12), 1256-1265. doi: 10.1094/PDIS.2000.84.12.1256