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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