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Janna L Beckerman

Botany and Plant Pathology 

  • Professor
Lilly Hall Room 1-321

Dr. Beckerman’s primary responsibility at Purdue University is to lead the plant pathology extension education effort in horticultural crops by developing and enhancing a close working relationship between the University, extension educators, and members of the fruit and ornamentals industries. There are two major approaches to managing plant disease in horticultural crops: Incorporating disease resistance, when possible, and utilizing fungicides, when necessary. Research in the Beckerman lab focuses on developing environmentally sound disease management strategies that are economically feasible for Indiana growers of specialty crops, from apples to hemp to zinnia. The goal of her extension program is to enable commercial growers to effectively and sustainably manage both chemical (fungicide) and genetic (disease resistance) resources while protecting the environment.


To this end, research in Dr. Beckerman’s lab includes:


*Biology and management of apple diseases, including apple scab, bitter rot, canker diseases and sooty blotch and flyspeck, with a focus on fungicide resistance and improved delivery

*Improving fungicide efficacy in horticulture crops

*Morel biology and genomics

*Hemp pathology

*Morel biology and genomics


As part of her extension program, she has developed (with Dr. Cliff Sadof, Entomology) a series of four apps, to assist homeowners in the diagnosis and management of landscape plants, and tomatoes.  these apps work for both the iOS and Android platforms.  For more information see 



Awards & Honors

(2012) PUCESA Team Award: Imprelis Herbicide Injury Response Team. Purdue University.

(2011) Richard L. Kohls Early Career Award. Purdue University.

(2010) Richard L. Kohls Early Career Award. Purdue University.

Selected Publications

Beckerman, J., & Creswell, T. (2014). First Report of Brown Rot (Monilinia fructicola) on the Dogwood, Cornelian Cherry (Cornus mas) Plant Disease, 9, 1275.

Wilson, A., Beckerman, J., & Aime, C. (2014). First report of the white pine blister rust fungus, Cronartium ribicola, on Ribes odoratum, in Indiana. Plant Disease, 98, 277.

Beckerman, J., Sundin, G., & Rosenberger, D. (2014). How IPM contributed to the current fungicide resistance crisis in apple management. Pest Managaement Science, 10(1002), 3715.

Leonberger, A., Speers, C., Ruhl, G., Creswell, T., & Beckerman, J. (2013). A Survey of Phytophthora species in Midwest Nurseries, Greenhouses, and Landscapes. Plant Disease, 97, 635-640.

Beckerman, J., & Kaur, R. (2012). Cover crop amendments for the suppression of Verticillium wilt in organic tomatoes grown in greenhouse, 201. Plant Disease Management Reports, 6:V159. Retrieved from

Beckerman, J. (in press). Detection of Fungicide Resistance. In Fungicides. M. Nita, Editor.

Beckerman, J., & Kaur, R. (2012). Evaluation of fungicide BAS500WU for control of seedling damping-off in tomato, 201. Plant Disease Management Reports, 6, OV160. Retrieved from

Beckerman, J., & Kaur, R. (2012). Evaluation of fungicide BAS500WU for control of seedling damping-off in vinca, 2011. Plant Disease Management Reports, 6:OT033. Retrieved from

Beckerman, J., Bordelon, B., Foster, R., & Hirst (2012). Home Fruit Production Spray Guide. (ID-146), 34. Retrieved from

Beckerman, J., Bordelon, B., & Babadoost, M. (2012). Midwest Small Fruit Spray Guide. (ID168), 89. Retrieved from