One Thousand Questions in California Agriculture Answered by Edward J. (Edward James) Wickson
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page 22 of 564 (03%)
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should certainly be employed against the latter trouble. It is not
desirable to have all the branches emerge at the same point, either 24 from the ground or at some lower level, as is preferable in interior situations, but branches should be distributed up and down and around the trunk so as to give a strong, well-balanced, low-headed tree. So far as wrapping interferes with the growth of shoots in this manner it is undesirable. Coal Tar and Asphaltum on Trees. What is the effect of coal tar or asphaltum applied to the bark of trees? 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. Whitewashing Fruit Trees. |
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