Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting: Guelph, Ontario, September 3, 4, 5, 1947
Science
Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting: Guelph, Ontario, September 3, 4, 5, 1947
Northern Nut Growers Association -- Periodicals; Nut trees -- Periodicals; Nuts -- Periodicals
The filbert crop this year is better than usual. Out of over a thousand
crosses between Rush and Winkler with European and Pacific Coast
varieties, in our estimation, only one has proven worthy of propagation
considering size, flavor, abundance of bearing and resistance to filbert
blight. Some growers think lightly of blight but our experience in
fighting it through the years in cutting out cankered wood has convinced
us of the futility of this means of control in infested areas. Control
measures may apparently succeed for a time but when conditions of
moisture, heat and air movement are just right it can spread like
wildfire. Therefore, to us, resistance to this disease (Cryptosporella
anomala) seems of paramount importance. The prevalence of blight has
been almost universal in the scattered plantings which we have visited
in central New York, usually without the owner knowing why his trees
were dying. All our European and Coast varieties, as well as most of the
hybrids, take blight readily but there is an occasional hybrid that is
clearly resistant. Bixby is one of these.
We have always used a knapsack sprayer equipped with a mist nozzle for
our trees but this is inadequate as the trees grow taller. This summer a
much more satisfactory nozzle was found that may be quickly adjusted to
throw a mist for low trees or a far reaching one for the taller trees.
This is made by the D. B. Smith Co. of Utica, N. Y.
From time to time articles appear on insects injurious to nut trees.
Frequently mentioned are the web worms and the walnut caterpillars. With
us, the damage they do is as nothing compared to that caused by the
curculios, the strawberry root worm beetles and the leaf hoppers. We are
getting the upper hand of the curculios by the use of cryolite spray but
the root-worm beetle problem is still unsolved. Until Rev. Crath wrote
of leaf hopper damage (Annual Report 1938 p. 111) we had not regarded
them as at all serious. Subsequent observation has convinced us that he
was right and that they are often the cause of the blackening and dying
of the tender young leaves of Persian walnuts and the curling up of
older leaves. We were especially impressed during the Wooster, Ohio,
field trip last year and, later on, in seeing how Mr. Sherman had
overcome this trouble on the Mahoning Co. farm simply by adding DDT to
his spray mixture.
In closing, we would like to call the attention of new members to the
wealth of information that is to be found in the old Association annual
reports.
Experience with the Crath Carpathian Walnuts
GILBERT L. SMITH, Wassaic, New York
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