One Thousand Questions in California Agriculture Answered — John Shaqi
One Thousand Questions in California Agriculture AnsweredWickson, Edward J. (Edward James)
Science
One Thousand Questions in California Agriculture Answered
Wickson, Edward J. (Edward James)
Agriculture -- California
The wrapping is desirable both to protect them from rabbits and from
sunburn, and either this or whitewash or some other form of protection
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.
When is the proper time to whitewash walnut trees to prevent sun scald?
How high up is it advisable to apply the wash?
Whitewash after heavy rains are over and before the sun gets very hot;
near the coast see that it is on early in April; in the interior it
should be in place in March. Do not wait until all the rains are over,
because there is a great chance of bark-burning between rains in the
spring. Whitewash the trunk and the larger limbs - wherever the sun can
reach the bark; being careful to keep the surface white where the 2
o'clock sun hits it. Be particular to whitewash, or otherwise protect by
"protectors" or burlap wrappings, all young trees; the young tree is
more apt to be hurt than an old one, but bark seems never to get too old
to burn if the sun is hot enough.
Shaping a Young Tree.
In shortening back long, slim limbs the side shoots come out, and one
soon has a lot of ugly, crooked limbs to look at. There are a number of
orchards here being spoiled in that way. How is this avoided?
You cannot secure a low-heading, well-shaped tree without cutting back
the branches. Afterward you can improve the form by selecting shoots
which are going in directions which you prefer, or you can cut back the
shoots afterward to a bud which will start in the direction which you
desire. In this way the progressive shaping of the tree must be pursued.
If you only have a few trees and can afford the time, you can, of
course, bend and tie the branches as they grow, so that they will take
directions which seem to you better, but this is not practicable in
orcharding on a commercial scale. There is no disadvantage in crooked
branches in a fruit tree, but they should crook in desirable directions,
and that is where the art in pruning comes in.
Pruning Times.
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