32 



Sun scald causes the bark on the south and west sides of young, thin- 

 barked trees to die and crack off. This may be avoided by wrapping 

 burlap around the trunk or by using wood veneer guards. Where this 

 injury has occurred the loose bark should be removed and the wound 

 painted. 



Wind and snow often cause large limbs to split off. Such injuries 

 should be smoothed over and painted. Care should be taken that no 

 place is. left in which water can accumulate. Splits may be prevented 

 by bracing any limbs which have weak crotches. The best way is to 

 use eye bolts through the limbs two to six feet above the crotch and 

 connect them with a strong wire cable. In using bolts, the hole where 

 the head and washer come should be counter sunk below the cambium 

 and later filled with asphalt, 



MISCELLANEOUS INJURIES 



Street trees are very apt to be injured by horses. Where this danger 

 exists the tree should be protected b.y iron or wooden guards made large 

 enough to avoid strangling the tree. Frequent examinations are neces- 

 sary to insure that the tree is not being girdled by the guard. 



Where parking spaces are small or where the ground may be tramped 

 down solidly there is danger that there will be insufficient soil moisture 

 and a deficiency of air for the roots. The use of grills or gratings 

 around the base of these trees will provide better ventilation and will 

 permit more moisture to reach the roots. 



Escaping gas, ice cream salt, smoke, grade changing, and many other 

 causes are responsible for tree sickness in cities. When in doubt write 

 to the State Forester for advice. 



THE BEST TREES FOR TEXAS 



(See map, page 6.) 



For East Texas the best trees for shade are American elm, water oak, 

 willow oak, burr oak, sycamore, sweet gum, pecan, and white ash. Only 

 slightly less valuable are sugar maple, black walnut, tulip tree, overcup 

 oak, Spanish oak, Texan oak, and hackberry. Of the evergreens the 

 best are live oak, holly, magnolia, longleaf pine, shortleaf pine, loblolly 

 pine, and Himalayan cedar. 



In Central Texas the best trees are hackberry, American elm, syca- 

 more, water oak, willow oak, burr oak, Texan oak, and pecan. Next in 

 importance come green ash, white ash, overcup oak, Spanish oak, box 

 elder, black walnut and mulberry. Of the evergreens red cedar, Hima- 

 layan cedar, Arizona and Italian cypress, loblolly pine, and live oak 

 are best. 



In South Texas the most satisfactory shade trees are hackberry, black 

 walnut, mulberry, and pecan. Of the other trees which grow there, box 

 elder, silver maple, pomegranate, yucca, palmetto, loquat, and mesquite 

 are fair. Olive, camphor, live oak, red cedar, and Arizona cypress are 

 the best of the evergreens. 



Southwest Texas has a climate and soil not adapted to tree growing. 

 Irrigation is needed in any event. With some attention and occasional 

 waterings honey locust, black locust, cottonwood, silver poplar, and salt 



