Northern Nut Growers Association Report of the Proceedings at the 43rd Annual Meeting: Rockport, Indiana, August 25, 26 and 27, 1952
Science
Northern Nut Growers Association Report of the Proceedings at the 43rd Annual Meeting: Rockport, Indiana, August 25, 26 and 27, 1952
Northern Nut Growers Association -- Periodicals; Nut trees -- Periodicals; Nuts -- Periodicals
About 1946 we noticed that all of the pecans on the Busseron were like
these that we have here--did not mature, completely covered with scab
fungus and dropped off the tree. The shells were so thin that you could
just crush the whole pecan, hull, shell and all with no meats in them.
The Major tree right beside it and the two Green River trees had none of
this trouble, and they have none of it as yet. And each year now that
this Busseron tree has borne there, practically all of the nuts have
been like this.
At the time we located this disease first in 1946, I sent samples to the
U.S.D.A. at Washington and also to the Southeastern Pecan Laboratory at
Albany, Georgia, and Dr. Cole, there identified it as pecan scab.
I reported the presence of the disease to Mr. Wilkinson and to Dr. Colby
and they were surprised to see the disease on Busseron in any location,
and particularly that far north.
In the south this disease frequently affects Schley, Delmas, Alley and
Van Deman and some others. Formerly the trees were sprayed with Bordeaux
Mixture. I think they are using Zerlate now. It's a problem to be
reckoned with. It occurs on the nuts and on the leaves, and it is
carried over winter on the stems and the one-year shoots.
Further News About Oak Wilt
E. A. CURL, _Illinois Natural History Survey, Urbana, Ill._
In 1951 a review of the oak wilt situation was given in a paper,
"Present Status of the Oak Wilt Disease", at the Forty-Second Annual
Meeting of the N.N.G.A. at the University of Illinois. The following
report is aimed at bringing up to date the present known distribution
of the oak wilt disease, recent developments in scientific research on
the disease, and possible control measures.
The oak wilt disease is caused by the fungus _Chalara quercina_ Henry
and is characterized by a very noticeable bronzing and wilting of leaves
that drop prematurely. Brown streaks are usually present in the outer
sapwood. These symptoms may be seen from June to September or until
normal autumn colors of the foliage develop.
More than 30 species of oak are known to be susceptible to the disease.
Other susceptible genera of the family Fagaceae are Chinese chestnut,
_Castanea mollissima_, golden chinquapin, _Castanopsis chrysophylla_,
tanbark oak, _Lithocarpus densifiora_, and _Nothofagus_ from South
America. The red and black oaks seem to be most susceptible and are
often killed within 6 weeks after infection.
Distribution
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