Coal Tar And Asphaltum On Trees
What is the effect of coal tar or asphaltum applied to the bark of
The application of coal tar to prevent the root borers of the prune
which operate near the surface of the ground was found to be not
injurious to the trees, although there was great apprehension that there
would be. The application of asphaltum, what is known as "grade D," has
been also used to some extent in the Santa Clara valley without injury.
Of course, in the use of any black material, you increase the danger of
sunburn, if applied to bark which is reached by the sun's rays.
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