Powdery Mildew Observatios and Growth of Crapemyrtle in Teneessee

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  • 1 1Univ. of Tennessee, P.O. Box 1071, Knoxville, TN 37901
  • | 2 2Tennessee State Univ., Nursery Crops Research Station, 472 Cadillac Lane, McMinnville, TN 37110

Fifty-five cultivars of crapemyrtle were established in a cultivar trial with 10 single-plant replications during Fall 1993 and Spring 1994. Drip irrigation began on a regular basis on 18 May 1994 and plants were fertilized regularly. Powdery mildew appeared in July, and within 2 to 3 weeks maximum levels of infection occurred. Plants were rated using a scale of 0 (healthy) to 5 (totally mildewed). In the group of seven cultivars, most heavily infected (>2.8 rating), `Byers Wonderful White' was worst (4.1), followed by `Royalty', `Pink Lace', `Prairie Lace', `Petite Plum', `Firebird', and `Christmastime'. There were 21 cultivars with no mildew (0.0). Many of these were USDA–NA hybrids but also included `Hope', `Bourbon Street', `Glendora White', `Petite Snow', `Centennial Spirit', and `Hardy Lavender'. A few USDA–NA hybrids had slight mildew: `Potomac', `Powhatan', `Catawba', `Seminole', `Biloxi', and `Hopi' (<10% of foliage mildewed).

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