Guido Schnabel Associate Professor, Fruit Pathology OFFICE: B02 Long Hall ADDRESS: Dept. of Entomology, Soils, & Plant Sciences, 113 Long Hall, Clemson, SC 29634-0315 TELEPHONE: 864-656-6705 FAX: 864-656-0274 E-MAIL: schnabe@clemson.edu

Research Interest

Our goal is to advance the science of tree fruit pathology in general and to study diseases affecting peach trees and peach fruit specifically. We conduct basic (traditional and molecular) and applied research to help our peach growers deal with disease-related problems. Areas of interest include the molecular basis and management of fungicide resistance in the brown rot pathogen Monilinia fructicola and the development of novel strategies to manage Armillaria root rot (caused by Armillaria tabescens in the Southeast).

NEW Extension Peach Disease Management Lab Web Site

Current  lab members
The fruit pathology lab currently consists of one technician, Karen Bryson, one postdoctoral scientist, Dr. Achour Amiri, and two graduate students, Alexis Nagel and Hetal Kalariya.

Outreach Highlights

Extension work is primarily focused on peaches with a little bit of strawberries mixed in. An important outlet of disease management recommendations is the Southeastern Peach, Nectarine, and Plum Pest Management Guide and the Southeastern Peach Growers Handbook (http://www.ent.uga.edu/pubs.htm). Furthermore there will be a book coming out soon “The Peach” with a great educational peach disease chapter. We are working with county agents on resistance profiling in order to optimize brown rot management and minimize environmental exposure of pesticides; and with growers to test novel approaches of disease management in their own fields.

Selected Publications

Luo, C. X, Cox, K. D., Amiri, A. and Schnabel, G. 2008.  Occurrence and detection of the DMI resistance-associated, genetic element 'Mona' in Monilinia fructicola. Plant Disease, accepted for publication.

Amiri, A., Scherm, H., Brannen, P. M., and Schnabel, G. 2008. Laboratory evaluation of three rapid, agar-based assays to assess fungicide sensitivity in Monilinia fructicola.  Plant Dis. 92:415-420.

Holb, I. J. and G. Schnabel 2008. The benefits of combining elemental sulfur with a DMI fungicide to control Monilinia fructicola isolates resistant to propiconazole. Pest Manag. Sci. 64:156-164.

Luo, C. X. andG. Schnabel 2008. Adaptation to fungicides in Monilinia fructicola isolates with different fungicide resistance phenotypes. Phytopathology 98:230-238.

Luo, C.X. and Schnabel, G. 2008. The cytochrome P450 lanosterol 14a-demethylase gene is a demethylation inhibitor fungicide resistance determinant in Monilinia fructicola field isolates from Georgia. Appl. Environ. Microbiol. 74:359-366.

Schnabel, G., D. R. Layne and I. J. Holb 2007. Micronised and non-micronised sulphur sprays control peach scab equally well with negligible impact on fruit quality. Annals of Applied Biology 150:131-139.

Holb, I. J. and G. Schnabel 2007. Differential effect of triazoles on mycelial growth and disease measurements of Monilinia fructicola isolates with reduced sensitivity to DMI fungicides. Crop Protection 26:753-759.

Cox, D. K., K. P. Bryson, and G. Schnabel 2007. Instability of propiconazole resistance and fitness in Monilinia fructicola. Phytopathology 97:448-453.

Schnabel, G. and J. Mercier 2006. Use of a Muscodor albus pad delivery system for the management of brown rot of peach in shipping cartons. Postharvest Biology and Technology 42:121-123.

Cox, K. D., D. R. Layne, R. Scorza, and G. Schnabel 2006. Gastrodia Anti-Fungal Protein from the orchid Gastrodia elata confers disease resistance to root pathogens in transgenic tobacco. Planta 224:1373-1383.

Schnabel, G., W. Chai, and K. R. Cox. 2005. Identifying and characterizing summer diseases on ‘Babygold’ peach in South Carolina. Plant Health Progress. Doi:10.1094/PHP-2006-0301-01-RS.

Schnabel, G., J. S. Ash, and P. K. Bryson. 2005. Identification and characterization of Armillaria tabescens from the southeastern United States. Mycol. Res. 109:1208-1222.

Holb, I. J. and G. Schnabel. 2005. Effect of fungicide treatments and sanitation practices on brown rot blossom blight incidence, phytotoxicity, and yield for organic sour cherry production. Plant Dis. 89:1164-1170.

Schnabel, G., K. E. Bussey, and P. K. Bryson. 2005. First Report of Armillaria gallica causing Armillaria root rot in daylily in South Carolina. Plant Dis. 89:683, 2005.

Schnabel, G., P. K. Bryson, W. C. Bridges, and P. M. Brannen. 2004. Reduced sensitivity in Monilinia fructicola to propiconazole in Georgia and implications for disease management. Plant Dis. 88:1000-1004.

Schnabel, G. and D. R. Layne., 2004. Comparison of reduced-application and sulfur-based fungicide programs on scab intensity, fruit quality, and cost of disease control on peach. Plant Dis. 88:162-166.

Schnabel, G. and Q. Dai. 2004. Heterologous expression of the 14alpha-demethylase gene from Monilinia fructicola reduces sensitivity to some but not all DMI fungicides. Pestic. Biochem. Physiol. 78:31-38.

Work hard and stay fit at Clemson University

Contact me if (i) you live in or near Clemson SC, (ii) you are a competitive table tennis player, and (iii) you are looking for training partners: schnabe@clemson.edu

Key words: ping pong, ping-pong, table tennis