erent seedling trees in their
susceptibility to this disease is well illustrated in some of the
following observations which were made the present year. The percentages
which follow the varieties named were determined by counting at least
100 nuts on a tree just before the blighted nuts began to drop. In a
seedling grove in the Whittier district about 300 trees were examined
and 100 nuts counted on each tree. The individual trees varied from 2
per cent to 85 per cent blighted nuts, while the grove as a whole
averaged 25 per cent. There were at least a dozen or fifteen trees in
this grove which were blighted less than 10 per cent, although some of
the nearby trees were blighted as high as 60 per cent or 70 per cent.

Another seedling grove in Orange County which was counted in the same
way, averaged 47 per cent blighted nuts during the second week in June.
In making this determination 105 trees were examined. In this same
grove, there were, however, at least three trees which averaged less
than 6 per cent blighted nuts.

It is interesting to know that the Placentia variety, growing within a
stone's throw of the aforementioned seedling grove and under identical
cultural conditions, was blighted to the extent of 71.9 per cent on the
same date.

Observations of the Prolific (Ware's) in the vicinity of the above
mentioned grove, showed less than 1 per cent blighted nuts on the trees
and practically none of the nuts have dropped to the ground at the
present time, yet in the past this variety has not had a reputation for
disease immunity. The original Chase tree was observed during this time
and showed a percentage of 37 per cent blighted nuts. These examples are
given neither in support of any particular variety nor to discredit
others, but are noted merely to call attention to the wide variation,
and this variation is a great source of encouragement in our endeavors
to produce a disease resistant variety.

Of course blight immunity is not the only factor to be considered in
selecting a variety of walnut. A profitable yield of good commercial
nuts is the real test of the superiority of any variety. A very heavy
yielding tree with a small amount of blight may prove more profitable
than a light yielding variety that is totally immune to this disease.

The production of a medium grade nut which would grade only as a
seedling No 1, might prove more profitable if the tree is at least
partially blight immune than the productio