262 THE SOIL CONSERVATION SERVICE 



locust and shortleaf pine in the lower Central States, the South, and 

 Southeast. There is little difficulty with erosion in the forested areas 

 that are not over-grazed or seriously burned, particularly where the 

 forest litter has not been destroyed by surface fires. Where gullies 

 have reached the advanced stages, check dams of various forms must 

 be constructed. The edges of gullies are leveled off, and grass and 

 trees are planted to prevent further washing. Usually the successful 

 control of erosion, particularly of gullies, consists of an application 

 and coordination of all these measures. Terracing alone is not suffi- 

 cient to check soil erosion. Although terracing may be a very useful 

 instrument in some phases of this work it is generally found that a 

 combination of all methods must be pursued in order to obtain satis- 

 factory results. 



