There is no information on resistant species of oak. In very rare cases,
however, trees have been observed to recover after showing symptoms in
the early spring.

Future Outlook

Among the many things that we need to know yet about the oak wilt
disease and its causal fungus one is outstanding. How does the disease
jump from one infection center to healthy trees 200 yards, 2 miles or
even 100 miles away? Although spread through root grafts may be
controlled by severing root connections, the value of such a control
measure is limited as long as the agent or agents responsible for long
distance spread remain unknown. The discovery of other methods of spread
might result in the development of control measures that are cheaper and
less drastic than those known at present.

A great deal remains to be done and research is increasing in the
various states concerned. There is reason to believe that oak wilt can
be checked before it reaches devastating proportions comparable to
chestnut blight which wiped out our American chestnuts.

MR. SLATE: What is the origin of the fungus? Is it a native fungus, or
imported?

MR. CURL: Yes, it is a native fungus, as far as we know.

MR. SLATE: Any evidence that the fungus is mutating to make more
virulent strains?

MR. CURL: That's something that hasn't been found yet. There are several
strains of the fungus, what we call strains, because they will form the
sexual stage, and a strain alone will not. There is not too much known
about that yet, the strain business.

MR. GRAVATT: Just a word. We had a conference in Beltsville all day
Sunday about the recent developments on the oak wilt. There has been
very extensive spread in Pennsylvania, Ohio, West Virginia and Maryland
this year. We are very much alarmed about the situation. The Chinese
chestnut is very severely affected. We have learned that in Missouri.
One year there were three Chinese chestnuts killed by the fungus, the
next year 60. The oak wilt is a serious threat to the chestnut orchards.

Life History and Control of the Pecan Spittle Bug

STEWART CHANDLER, _Associate Entomologist, Ill. Nat. History Survey,
Urbana, Ill., Consulting Entomologist, Southern Illinois University_

Since it was a year ago that this subject of spittle bug was first
brought to the attention of the Northern Nut Growers Association, it
might be well to review briefly the high lights of that report. I told
you at the annual meeting at