Selection for Recurrent Type
¥Trichome density and type
¥Stipule size and shape
¥Leaf shape
¥Tooth shape
¥Lenticel density, size and color
¥Stem color
¥Form
¥Time of leaf emergence
¥Vigor
Each
backcross generation will vary in the remaining proportion of Chinese
heritage. By picking trees with
the fewest Chinese traits (except
blight resistance), we accelerate the recovery of American type. At the present time, this selection is
done using the following morphological
traits:
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