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ARS Home » Northeast Area » Washington, D.C. » National Arboretum » Floral and Nursery Plants Research » Research » Publications at this Location » Publication #329338

Research Project: Genetics, Genetic Improvement, and Improved Production Efficiency of Nursery Crops

Location: Floral and Nursery Plants Research

Title: Response of crapemyrtle varieties to Cercospora leaf spot, 2015

item BAYSAL-GUREL, FULYA - Tennessee State University
item Fare, Donna
item LIYANAPATHIRANAGE, PRABHA - Tennessee State University

Submitted to: Plant Disease Management Reports
Publication Type: Other
Publication Acceptance Date: 6/25/2016
Publication Date: 9/5/2016
Citation: Baysal-Gurel, F., Fare, D.C., Liyanapathiranage, P. 2016. Response of crapemyrtle varieties to Cercospora leaf spot, 2015. Plant Disease Management Reports. 10:006.

Interpretive Summary:

Technical Abstract: Crapemyrtle varieties, Lagerstroemia spp., were evaluated for Cercospora leaf spot in two field test evaluations, planted in either 2004 or 2011 at the Otis L. Floyd Nursery Research Center in McMinnville, TN. The experimental designs for both test evaluations were a randomized complete block design with five replications; however, in 2014, the 2004 test was reduced to three replications due to plant size. Severity of Cercospora leaf spot was determined on 8 Sep, 15 Sep and 22 Sep in the 2004 test and 2 Sep, 15 Sep and 22 Sep in the 2011 test and disease severity was evaluated using a scale of 0-100% foliage affected. Cercospora leaf spot appeared naturally and disease pressure was high in the tests. There were significant differences among varieties in severity of Cercospora leaf spot. ‘Townhouse’, ‘Woodlander’s Chocolate Soldier’ and ‘Kiowa’ varieties in the 2004 test were highly resistant to Cercospora leaf spot under these conditions, with foliar ratings of 1.0-2.0% foliage affected. Season-long disease progress (AUDPC) was highest in ‘Dynamite’, ‘Christiana’ and ‘Burgundy cotton’ in the 2004 test. In the 2011 test, Cercospora leaf spot severity on 22 Sep was significantly lower in ‘L. limii 1’, ‘Tuscarora’, ‘L. subcoastata ’, ‘Arapaho’ and ‘Osage’ than in the other varieties, with foliar ratings of 1.7-3.0% foliage affected in the 2011 trail. Season-long disease progress in the 2011 test was highest in the crapemyrtle variety ‘Rhaposody in Pink’.