Powdery Mildew Observations and Growth

in HortScience
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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

Eighty-one oak taxa were established at the Nursery Crops Research Station in McMinnville, Tenn., in Fall 1993 and Spring 1994. Drip irrigation was applied as needed beginning 18 May 1994 and plants were fertilized regularly. Powdery mildew began to appear in July on some taxa. Each plant was rated on a scale where 0 = healthy plant and 5 = totally mildewed. Height and caliper were recorded in Fall 1994 and the 1994 growth increment calculated. Quercus robur fastigiata was most severely affected by powdery mildew (4.1), followed by a group of six taxa, including douglasii, oglethorpensis, macrocarpa, virginiana, prinus, and aliena (2.3–1.4). There were slight amounts of mildew on 26 taxa and 48 taxa were mildew-free. Growth increment in height and caliper will also be presented.

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