Plants – Broadleaf tree
Plant Patent
1999-09-13
2002-07-09
Campell, Bruce R. (Department: 1661)
Plants
Broadleaf tree
Plant Patent
active
PP012768
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 “Renci”.
BACKGROUND OF THE INVENTION
‘Renci’ was discovered by the inventor in a group
Betula papyrifera
in a provenance test plot planted in Wooster, Ohio, in 1986. ‘Renci’ was originated from the open pollinated cross in a birch selection/breeding program in Wooster, Ohio. The non-patented female parent was
Betula papyrifera
as well as the male parent. ‘Renci’ was first noticed with a pyramidal growth habit, white, essentially non-exfoliating bark and a very high resistance to the Bronze Birch Borer. The growth habit renders it ideal for clumping. The first act of asexual reproduction of ‘Renci’ was accomplished by the inventor from the initial selection in our test plot on New Carlisle, Ohio. Currently, asexual reproduction is accomplished by micropropagation or tissue culture in Olympia, Wash. Horticultural examination of selected units has demonstrated that the combination of characteristics as herein disclosed for ‘Renci’ are firmly fixed and retained through its successive generations of asexual reproduction. ‘Renci’ has been observed in Sturgeon Bay, Wis. and New Carlisle, Ohio 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 a cultivar. The following observation, measurements, and comparisons describe the plants grown in New Carlisle, Ohio, and 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 characteristics of ‘Renci’ which in combination distinguish this birch tree as a new and distinct cultivar:
1. Distinctive pyramidal growth habit with branching angles about 38-40°.
2. Bark color changes as the tree matures; from brown turning to only slightly exfoliating white bark.
3. Very high resistance to the Bronze Birch Borer.
4. Rapid growth rate.
The new cultivar can be compared to nonpatented
Betula papyrifera
. The nonpatented plants have a loose oval growth habit and white exfoliating bark. They have variable resistance to the Bronze Birch Borer. The numbered traits above clearly distinguish the new cultivar from nonpatented
Betula papyrifera.
Campell Bruce R.
Drehkoff W. Dennis
Evergreen Nursery Company, Inc.
McCormick Susan B.
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