d with Broadview Persian walnut, a
British Columbia origination considered a hardy variety. Broadview has
often suffered winter injury at both locations, and in 1950-51 was
killed to the understock at Urbana.
The suggested test regions for the Colby Persian walnut include those
with a climate similar to central Illinois, and where spring freezes are
not generally a problem. The suggested understock is black walnut (_J.
nigra_) though established hardy Carpathian and other Persian walnuts
may be satisfactory for top working.
Additional wood for propagation of the Colby will be available in small
quantities next August to nut nurserymen and other experiment stations.
(Walnut scions cannot be sent from Illinois to California.) Trees of
Colby should be available from several cooperating nurseries in the fall
of 1953.--Reprinted from _Fruit Varieties and Horticultural Digest_,
6(4):72-75. 1952.
FOOTNOTES:
[Footnote 20: According to U.S.D.A. workers in walnut breeding, pollen
of other _Juglans_ species is not to be depended upon for securing a set
of fruit on this species. Several hardy Persian varieties of good
quality which have won awards in recent contests are being propagated
but have not been grown at Urbana. These include the Lake, McKinster,
and Metcalfe among others of Carpathian parentage, and two
non-Carpathian varieties, Hansen and Jacobs, which have been fruitful in
northwestern Ohio. Before one or more of these can be recommended as a
pollinator for the Colby walnut, however it will be necessary to have
them flowering in the same orchard for a period of several years.
Among the other Carpathian walnuts which have flowered in the orchard
containing the original Colby tree, there is one very hardy seedling, R
5 T 27, which in 1951 and 1952 produced abundant pollen at the proper
time to pollinate the Colby. Tree R 5 T 27 an open pollinated seedling
of Crath No. 23, is protandrous, but later flowering than the Colby with
respect to pistils as well as catkins, and consequently most of its
pistillate flowers fail to set fruit in years like 1951 when there was
no later Persian walnut pollen available. The R 5 T 27 tree produces an
attractive, smooth shelled nut slightly smaller than that of Colby, not
quite as sweet in flavor, and slightly earlier in maturity. Because of
its hardiness and apparent value as a pollinator for Colby, propagating
wood from this R 5 T 27 walnut tree will be available to experimente
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