Guido Schnabel

Professor of Plant Pathology - Fruit Crops
Graduate Student Coordinator
Plant and Environmental Sciences Department, Public Service Activities

Office: 105 Collings St./220 BRC
Phone: 864-656-6705

Email: schnabe@clemson.edu
Personal Website: http://www.peachdoc.com

Educational Background

Ph.D.
Univ Hohenheim, Ger 1997

M.S.
JLU Giessen, Ger 1993

B.S.
JLU Giessen, Ger 1990

Courses Taught

Plant Disease Diagnostics Summer Course

Profile

Dr. Guido Schnabel is a plant pathologist at Clemson University with over 25 years of experience working with pathogens of fruit crops. He has an active research and extension program focused on management of diseases of small fruits and stone fruits. His lab publishes in highly ranked, peer-reviewed journals. Since 2019 he has been Associate Editor of Pesticide Biochemistry and Physiology'. His research and extension activities were recognized with the APS Lee Hutchins Award for Excellence in Tree Fruit Research in 2011, The APS Excellence in Extension Award in 2015, the Clemson University Godley Snell Award for Excellence in Research and the Clemson University Centennial Professorship Award.

Research Interests

-manage diseases affecting peach and strawberry
-develop cultural and biological control tactics for IPM systems
-determine molecular mechanisms of fungicide resistance in fungal plant pathogens
-efficacy of fungicides in vitro and in field trials
-prevalence and causes of peach skin disorders

Lab Members

Jhulia Gelain, lab manager

PhD students
Johanna Wesche, Germany, PhD student (2023-2025)
Harleen Kaur, PhD student (2021-2024)
Melissa Munoz, Columbia (PhD student; Gray mold of roses) (2019-2022)
Madeline Dowling, USA (PhD Plant Environmental Sciences) “Gray mold of strawberry” (2015-2018)
Susan Tsuji, PhD student, Brazil (Fungicide resistance in C. theobromae from papaya (2014-2015)
Shuning Chen, PhD student China “Fungicide resistance in Botrytis cinerea” (2014 to 2016)
Fengping Chen, China (PhD student) DMI fungicide resistance mechanisms in Monilinia fructicola (2010-2012)
Xingpeng Li, China, (PhD Plant Environmental Sciences) “Precision gray mold control in strawberry” (2010-2015)
Alexis Nagel, USA (PhD Genetics and Biochemistry) “Understanding GAFP, a plant lectin with broad spectrum inhibitory activity” (2005-2010)

MS students
Rulyu Meng, China, MS student, (2019-2022)
Will Gura, MS student (2021-2023)
Sara Price, MS student (2021-2023)
Brodie Cox, USA (MS student, Bacterial spot 2018-2020)
Harriet Boatwright, USA (MS student, PES), “intelligent sprayer”, (2017-2020)
Melissa Munoz, Columbia (MS student; Gray mold of roses) (2017-2019)
Linus Schmidt, Germany (MS student, PES), “Peach Skin Disorders”, (2017-2019)
Martha Froelich, USA (MS student, PES) “Causal agents of twig blight of peach” (2016-2019)
Fan Zhen, China (MS Plant Environmental Sciences), Fungicide resistance in Alternaria alternata (2013-2015)
Madeline Dowling, USA (MS Plant Environmental Sciences) Mutagenesis by fungicides in M. fructicola (2013-2015)
Anja Grabke, Germany (MS Plant Environmental Sciences) Fungicide resistance in Botrytis cinerea (2012-2014)
Hetal Kalariya, India, (MS Plant Environmental Sciences) “Characterization of plum plants expressing GAFP-1 under bul409 promoter” (2008-2010)
Karen E. Bussey, USA (MS Plant Environmental Sciences) “Development of strategies to control Armillaria root rot in commercial peach orchards” (2004-2006)

Extension and Outreach

-provide timely and useful information to commercial growers via production guides, presentations, website, newsletters, smartphone apps, etc
-generate applicable data for sustainable fruit production
-generate new outreach tools such as the MyIPM smartphone app.

Publications

Recent Publications
1. Calle, A., Adelberg, J., G., Schnabel, G. Naylor-Adelberg, J., Gelain, J., Karakoc, Y., Weaver, J., Saski, C., and G. Gasic 2024. In vitro co-culture system for investigating Armillaria root rot in Prunus spp. using a fiber-supported liquid approach. PlosOne. Accepted for publication.
2. Wesche, J., Z. Zeng, C. X. Luo, and G. Schnabel 2024. Pyrrolnitrin in Pseudomonas chlororaphis strain ASF009 metabolites reduces constitutive and DMI-induced MfCYP51 gene expression in Monilinia fructicola Plant Dis. in press.
3. Meng, F.Z., Wen, W.K. Wei, M.Z. Cai, Z.Q. Wang, L.F. Yin, W. Yin, G. Schnabel, and C.X. Luo. 2024. The Mediator complex subunit MoMed15 plays an important role in conferring sensitivity to isoprothiolane by modulating xenobiotic metabolism in M. oryzae. mBio, in press.
4. Calle, A., J. Adelberg, G. Schnabel, J.Naylor-Adelberg, J. Gelain, Y. Karakoc, J. Weaver, C. Saski, and K. Gasic 2024. In vitro co-culture system using a fiber-supported liquid approach. Protocols.io. https://dx.doi.org/10.17504/protocols.io.rm7vzj56xlx1/v1
5. Borda, A.M., J. Gelain, C. Minzheng, CXLuo, G. Schnabel, and J. E. Faust 2024. Effect of calcium propionate dip and spray applications on botrytis blight of ornamental plants. Phytofrontiers. In press. https://doi.org/10.1094/PHYTOFR-04-24-0042-R
6. Liu, D., Luo, M., Zhu, Y.X., Zeng, Z.Z., Hu, J.J., Cai, M.Z., Wang, J., Yin, W.X, Schnabel, G., and Luo C.X. 2024. Visual detection of fungicide resistance by combining RPA and CRISPR/Cas12a in peach Brown rot fungus Monilinia fructicola. Pest Manag. Sci. in press. http://doi.org/10.1002/ps.8330
7. Wesche, J., P. Wu, C-X. Luo, J. Faust, and G. Schnabel 2024. Bioproducts of Pseudomonas chlororaphis suppress DMI fungicide-induced CsCYP51A and CsCYP51B gene expression in Colletotrichum siamense and generate synergistic effects with metconazole and propiconazole. Phytopathology, in press. https://doi.org/10.1094/PHYTO-03-24-0090-R
8. Wesche, J., Z. Zeng, C-X Luo, and G. Schnabel 2024. Pseudomonas chlororaphis metabolites reduce MfCYP51 expression and yield synergistic efficacy in mixture with reduced rates of propiconazole against DMI-resistant Monilinia fructicola isolates. Plant Dis. In press. https://doi.org/10.1094/PDIS-04-24-0869-RE
09. Wesche, J. and G. Schnabel 2024. Influence of propiconazole and metconazole formulations on Bacillus subtilis vegetative cell growth and disease control of fruit crops. Phytopathology, 114:115-124. https://doi.org/10.1094/PHYTO-01-24-0029-R.
10. Panth, M., E. Noh, G. Schnabel, and H. Wang. 2024. Development of a long amplicon PMA-qPCR assay for detection of viable Xanthomonas arboricola pv. pruni cells in peach trees. Plant Dis. 108:2190-2196. https://doi.org/10.1094/PDIS-01-24-0012-RE.
11. Gura*, W. P., J. Gelain, and G. Schnabel 2024. Influence of preharvest polyoxin-D applications with or without spray oils on brown rot development and tree health of peach. Plant Health Progress 25:165-168. https://doi.org/10.1094/PHP-09-23-0075-RS.
12. Cieniewicz, E.J., Schnabel, E., Powell, G., Snipes, Z, and Schnabel, G. 2023. Detection and characterization of Xylella fastidiosa subsp. fastidiosa in rabbiteye blueberry in South Carolina. Plant Dis. 108:1476-1480. https://doi.org/10.1094/PDIS-11-23-2392-SC.
13. Zhang, J., J. Gelain, G. Schnabel, S. Mallawarachchi, H. Wang, N. Mulgaonkar, R. Karthikeyan, S. Fernando 2024. Identification of fungicide combinations for overcoming Plasmopara viticola and Botrytis cinerea fungicide resistance. Microorganisms 11 - 2966, https://doi.org/10.3390/microorganisms11122966.
14. Gura*, W. P., J. Gelain, E. J. Sikora, E. L. Vinson, P. M. Brannen, and G. Schnabel 2023. Low frequency of resistance to thiophanate-methyl in Monilinia fructicola polulations from southeastern United States peach orchards. Pestic. Biochem. Physiol. 197-105642: https://doi.org/10.1016/j.pestbp.2023.105642.
15. Gura*, W. P.., J. Gelain, E. J. Sikora, E. L. Vinson, P. M. Brannen, and G. Schnabel 2024. Re-evaluation of sensitivity of Monilinia fructicola isolates to the DMI fungicide propiconazole in the southeastern United States and investigation of the genetic element Mona. Plant Dis. 108:375-381. https://doi.org/10.1094/PDIS-04-23-0778-RE.
16. Meng*, R., J. Gelain, and G. Schnabel. 2023. Reduced sensitivity to fluazinam and tebuconazole in Colletotrichum nymphaeae from apple an investigation of target gene sequences. Trop. Plant Path. https://doi.org/10.1007/s40858-023-00584-7.

Links

Professional Website
Schnabel lab program video
Schnabel lab smartphone app MyIPM