mmature kernel.
When the shell can no longer be penetrated they continue to eat away the
husk, which is equally fatal to the nut. This continues until late in
July, when the squirrels take over. Fortunately squirrels are highly
allergic to a bullet from a 22 rifle.

In pointing out some of the hazards encountered in growing Persian
walnuts in the East the writer has not intended to be discouraging but
helpful. Persian walnuts of good quality can be grown in this section;
full understanding of the factors involved make it possible, I believe,
to grow them successfully on a commercial scale.

Varieties of Persian Walnuts in Eastern Iowa

Ira B. Kyhl, _Sabula, Iowa_

There are a great many varieties of Persian walnuts, many of which
originated in the region of the Carpathian mountains and other parts of
Europe and a few varieties in the United States and Canada.

I believe that some varieties now grown in the United States and Canada
which originated in Europe may have come from the same tree as they
appear to have the same shape, thickness of shell and flavor. I have as
many as four varieties that are identical.

The Persian walnut has always been my favorite nut. I started with 2 or
3 varieties and now have 35 or 40 varieties and 200 trees most of which
are doing well. Some are superior in hardiness and vigor.

In eastern Iowa at 42 degrees N. latitude minimum winter temperatures
vary from 25 to 32 degrees below zero. Usually the minimum is 12 to 15
degrees below zero, but last winter it was 25 degrees below zero for
several days. Only the hardier varieties will endure -25 degrees without
injury, but -12 to -15 does not injure any variety very much.

Schafer is my favorite variety and it was not injured at -25 degrees. I
have several of these trees, some from seeds, some top-worked on black
walnut and the others grafted trees from a nursery. It grafts easily,
grows rapidly and bears a fine nut.

A top-worked tree of Colby withstood -25 degrees without injury and is
one of the most vigorous trees I have.

Fifteen seedlings from Crath Mayette and Crath Franquette seeds from the
late G. H. Corsan, of Toronto, Canada, are developing into very fine
trees, but are not yet bearing.

One of the first varieties planted, Broadview, grew rapidly and
produced nuts after two mild winters, but the several trees of this
variety killed to the ground after the -25 degrees of last winter.

Crath No. 1, Crath No. 39,