[Illustration: FIG. 111.--Chestnut Trees Killed by the Chestnut
Disease.]

There is no remedy or preventive for this disease. From the nature
of its attack, which is on the inner layer of the tree, it is
evident that all applications of fungicides, which must necessarily
be applied to the outside of the tree, will not reach the disease.
Injections are impossible and other suggested remedies, such as
boring holes in the wood for the purpose of inserting chemicals, are
futile.

The wood of the chestnut tree, within three or four years after its
death, is still sound and may be used for telephone and telegraph
poles, posts, railroad ties, lumber and firewood.

Spraying for fungous diseases: Where a fungous disease is attacking the
leaves, fruit, or twigs, spraying with Bordeaux mixture may prove
effective. The application of Bordeaux mixture is deterrent rather
than remedial, and should therefore be made immediately before the
disease appears. The nature of the disease and the time of treatment
can be determined without cost, by submitting specimens of affected
portions of the plant for analysis and advice to the State
Agricultural Experiment Station or to the United States Department
of Agriculture.

Bordeaux mixture, the standard fungicide material, consists of a
solution of 6 pounds of copper sulphate (blue vitriol) with 4 pounds
of slaked lime in 50 gallons of water. It may be purchased in
prepared form in the open market, and when properly made, has a
brilliant sky-blue color. Spraying with Bordeaux mixture should be