Plants – Broadleaf tree
Plant Patent
1999-09-13
2002-07-09
Campell, Bruce R. (Department: 1661)
Plants
Broadleaf tree
Plant Patent
active
PP012767
ABSTRACT:
The present invention comprises a new and distinct cultivar of a birch tree, botanically known as
Betula papyrifera
, and is hereto referred to by the cultivar name “Uenci”.
BACKGROUND OF THE INVENTION
‘Uenci’ was discovered by the inventor in a group
Betula payrifera
in a provenance test plot planted in Wooster, Ohio, in 1986. ‘Uenci’ was originated from the open pollinated cross in a birch selection/breeding program on Evergreen Nursery Company, Inc., property in Sturgeon Bay, Wis. The female parent was
Betula papyrifera.
The pollen parent was
Betula papyrifera.
‘Uenci’ was first noticed with a narrow, open, vigorous, upright growth habit, white semi-exfoliating bark and a very high resistance to the Bronze Birch Borer. The upright and open growth of the crown facilitates clumping of the trees. The open growth further allows for grass to grow under the tree since more sunlight can penetrate the ground. The cultivar has been asexually reproduced in Sturgeon Bay, Wis. The current propagation is by micropropation at Sturgeon Bay, Wis. Horticultural examination of selected units has demonstrated that the combination of characteristics as herein disclosed for ‘Uenci’ are firmly fixed and retained through its successive generations of asexual reproduction. ‘Uenci’ has been observed in Sturgeon Bay, Wis. and Wooster, Ohio, since 1986 and characteristics have been stably maintained. The cultivar reproduces true to type. The new cultivar has not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature, day length and light intensity, without a change in the genotype of the cultivar. The following observations, measurements, and comparisons describe the plants grown in Sturgeon Bay, Wis. under natural field conditions which approximate those generally used in commercial growing operations.
SUMMARY OF THE INVENTION
The following traits have been repeatedly observed and are determined to be basic characterisitcs of ‘Uenci’ which in combination distinguish this birch tree as a new and distinct cultivar:
1. Distinctive narrow, open, vigorous, upright growth habit with branching angles about 50°.
2. Bark color changes as the tree matures; from brown turning to white.
3. Semi-exfoliating bark when mature.
4. Very high resistance to the Bronze Birch Borer.
5. Fast growth rate.
The new cultivar can be compared to the nonpatented
Batula papyrifera
for the foregoing characteristics differ from the nonpatented variety in that the nonpatented variety has variable resistance to the Bronze Birch Borer, has a loose oval growth habit and its bark is exfoliating.
Campell Bruce R.
Drehkoff W. Dennis
Evergreen Nursery Company, Inc.
Ladas & Parry
McCormick Susan B.
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