Abstract: A new and distinct Corylus plant named ‘PollyO’ is characterized by high nut yield, early nut maturity, small round nuts and kernels, high kernel percentage, good kernel blanching and excellent flavor. The tree is vigorous and has a desirable growth habit. ‘PollyO’ is resistant to bud mite (primarily Phytoptus avellanae Nal.). DNA markers and field exposure indicate that it is highly resistant to eastern filbert blight (EFB) caused by Anisogramma anomala (Peck) E. Müller.

Abstract: A new and distinct Corylus plant named ‘Burgundy Lace’ characterized by rich dark burgundy-colored developing leaves and burgundy-colored fully expanded leaves during the spring and summer; deeply dissected leaves; burgundy color of the catkins and leaf buds; moderate vigor and upright-spreading plant habit; resistance to eastern filbert blight (EFB) caused by the fungus Anisogramma anomala (Peck) E. Müller; presence of random amplified polymorphic DNA markers 152-800 and 258-580 in DNA; expression of incompatibility alleles S6 and S20 in the styles; catkins that are abnormal and small, and produce little pollen; and DNA fingerprints at 14 of 24 microsatellite marker loci differ from ‘Cutleaf’.

Abstract: A new and distinct Corylus plant named ‘McDonald’ characterized by moderate vigor and upright-spreading plant habit, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and 268-580 in DNA, expression of incompatibility alleles S2 and S15 in the styles, and DNA fingerprints at 14 of 21 microsatellite marker loci differ from both parents, ‘Tonda Pacifica’ and ‘Santiam’, and from one parent at an additional 5 marker loci.

Abstract: A new and distinct cultivar of Corylus plant named ‘Wepster’ characterized by high vigor and an upright-spreading plant habit, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Muller, presence of random amplified polymorphic DNA markers 152-800 and 268-580 amplified by the polymerase chain reaction and which are linked to a dominant allele for resistance to eastern filbert blight from the cultivar Gasaway, expression of incompatibility alleles Si and S2 in the styles, and DNA fingerprints at 8 of 20 microsatellite marker loci differ from both parents OSU 440.005 and ‘Tonda Pacifica’, and from one parent at an additional 12 marker loci.

Abstract: A new and distinct cultivar of Corylus plant named ‘Felix’ characterized by an upright plant habit and high vigor, green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and AA12-850, expression of incompatibility alleles S15 and S21 in the styles, and DNA fingerprints at 14 of 24 microsatellite marker loci differ from both parents OSU 384.095 and ‘Delta’, and from one parent at an additional 6 marker loci.

Abstract: A new and distinct cultivar of Corylus plant named ‘York’ characterized by globose plant habit and moderate vigor, green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and AA12-850, expression of incompatibility alleles S2 and S21 in the styles, and DNA fingerprints at 10 of 23 microsatellite marker loci that differ from both parents OSU 479.027 and OSU 504.065, and from one parent at an additional 11 marker loci.

Abstract: A new and distinct cultivar of Corylus plant named ‘Felix’ characterized by an upright plant habit and high vigor, green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Wüller, presence of random amplified polymorphic DNA markers 152-800 and AA12-850, expression of incompatibility alleles S15 and S21 in the styles, and DNA fingerprints at 14 of 24 microsatellite marker loci differ from both parents OSU 384.095 and ‘Delta’, and from one parent at an additional 6 marker loci.

Abstract: A new and distinct cultivar of Corylus plant named ‘Dorris’ characterized by a spreading plant habit and low vigor, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and 268-580, expression of incompatibility alleles S1 and S12 in the styles, and DNA fingerprints at 14 of 24 microsatellite marker loci differ from both parents OSU 309.074 and ‘Delta’, and from one parent at an additional 9 marker loci.

Abstract: A new and distinct cultivar of Corylus plant named ‘Wepster’ characterized by high vigor and an upright-spreading plant habit, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and 268-580 amplified by the polymerase chain reaction and which are linked to a dominant allele for resistance to eastern filbert blight from the cultivar Gasaway, expression of incompatibility alleles S1 and S2 in the styles, and DNA fingerprints at 8 of 20 microsatellite marker loci differ from both parents OSU 440.005 and ‘Tonda Pacifica’, and from one parent at an additional 12 marker loci.

Abstract: A new and distinct Corylus plant named ‘McDonald’ characterized by moderate vigor and upright-spreading plant habit, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and 268-580 in DNA, expression of incompatibility alleles S2 and S15 in the styles, and DNA fingerprints at 14 of 21 microsatellite marker loci differ from both parents, ‘Tonda Pacifica’ and ‘Santiam’, and from one parent at an additional 5 marker loci.

Abstract: A new and distinct Corylus plant named ‘Burgundy Lace’ characterized by rich dark burgundy-colored developing leaves and burgundy-colored fully expanded leaves during the spring and summer; deeply dissected leaves; burgundy color of the catkins and leaf buds; moderate vigor and upright-spreading plant habit; resistance to eastern filbert blight (EFB) caused by the fungus Anisogramma anomala (Peck) E. Müller; presence of random amplified polymorphic DNA markers 152-800 and 258-580 in DNA; expression of incompatibility alleles S6 and S20 in the styles; catkins that are abnormal and small, and produce little pollen; and DNA fingerprints at 14 of 24 microsatellite marker loci differ from ‘Cutleaf’.

Abstract: A new and distinct Corylus plant named ‘PollyO’ is characterized by high nut yield, early nut maturity, small round nuts and kernels, high kernel percentage, good kernel blanching and excellent flavor. The tree is vigorous and has a desirable growth habit. ‘PollyO’ is resistant to bud mite (primarily Phytoptus avellanae Nal.). DNA markers and field exposure indicate that it is highly resistant to eastern filbert blight (EFB) caused by Anisogramma anomala (Peck) E. Müller.