96 OUR NATIONAL FORESTS 



the regulation of watering places, and the exclusion 

 of sheep from cut-over areas on which reproduction 

 is deficient until the seedlings reach a sufficient 

 height to be out of the reach of the animals. 



Protection from Insects and Diseases. In co- 

 operation with the Bureau of Entomology and the 

 Bureau of Plant Industry the Forest Service is 

 conducting a large number of studies and inves- 

 tigations deahng with the insects and diseases that 

 do destructive damage to forests. The direct re- 

 sult of these studies will be the gradual eradication 

 of predaceous insects and dangerous tree diseases 

 from the valuable timber forests of the Gov- 

 ernment. Control measures already taken have 

 shown the value of exact scientific information. 

 On the Klamath National Forest some years ago 

 about 900 acres were treated for insect infestation. 

 The cost was about $3,000 and the amount of tim- 

 ber saved by the eradication of the insects was 

 worth over $600,000. Other studies are carried on 

 to identify and describe certain classes of insects, 

 such, for instance, as those that destroy the seeds of 

 trees in the cones. The various families, genera, 

 and species of forest insects are studied and de- 

 scribed, and the results are published in the form 



