trees showed a 4 per cent increase in disease during
the same period.

[Footnote 12: Hutchins, Lee M., and Horace V. Wester.
Graft-transmissible brooming disease of walnut. Phytopathology. 37 (1):
11. (Abstract) 1947.]

+Summary+

There is strong evidence that a virus disease is active among certain
species of walnut in central and eastern United States. The disease
exhibits distinctive symptoms and appears to damage infected trees,
sometimes severely, over several growing seasons. Present data indicate
that recognizable symptoms of the disease may not appear for some time
after infection, unless the host is subjected to severe shock. Thus,
nursery stock may be one means of spreading the disease into new areas.
It is recommended, without experimental work to back up the
recommendation, that walnut nurserymen remove infected trees in the
vicinity of their nursery sites.

Investigation of this disease to the present time has been limited.
General observations indicate that severely broomed trees produce poor
nut crops. Mortality caused by the disease appears to be quite low among
black walnut trees. Butternut and Japanese walnut trees are, in general,
more severely affected by the disease than the black walnut and many
seem to be killed by it, although the killing process is slow. As a
result of experience with other virus diseases, orchardists who have
only a few infected trees among their black walnuts are advised to
remove them. Whether the disease can be kept under control by repeated
roguing is uncertain. If an owner has just a few trees of value as
ornamentals as well as nut producers, one hesitates to advise him to
remove a lightly infected tree until more information is obtained
concerning the disease.

This Division will welcome information from persons having experience
with the brooming disease of walnut, as it is in a position to do only a
limited amount of work on the disease.

+Persimmon Wilt+

Persimmon wilt is very destructive to the native persimmon (Fig. 4). It
is caused by the fungus _Cephalosporium diospyri_, which was described
in 1945 by Bowen S. Crandall[13]. The fungus grows in the wood of the
trees, producing discolored streaks. Most trees are rapidly killed,
with yellow, wilted leaves making quite a contrast to the normal green
trees.

This disease was found in spots from central Tennessee south to the
Gulf, east into Florida, and up the coast into North Carolina. The
American persi