Snow and Windbreak:- At least one heavy infestation in Dis- 

 trict 5 has "been due to this cause, thai: on the southern 

 Stanislaus and on the whole front of the Sierra Porec.-t. 

 Heavy snow or windbreak must be reported by the rangers to 

 the Supervisor and if the Supervisor thinks it of sufficient 

 importance, an investigation should be made and a regular 

 reconnaissance report submitted to the District Forester. 



_ Snow or windbreak piled and burned before the insects escape 

 will prevent infestation at far less expense than that entail 



ed in the subsequent handling of the infestation after the 

 beetles have attacked the standing timber. 



Windfalls:-'. \7inclfalJ.s are also a cause of infestation. They 

 generally occur in mature timber. Extensive windfall should 

 be reported in the Scone manner as snowbreak and the trees 

 after they become infested should be treated the same as in 

 regular control work. By controlling infestations in wind- 

 fall much timber can be saved at less cost than in regular 

 control work as the tree does not have to be felled and is 

 more easily peeled, 



How to Pick Out Infested T'reca: 



Epidemic infestations are conspicuous on account 

 of the large number of dying trees. In normal infestations 

 the individual infested trees can be located by the vellow- 

 ing of the foliage, which makes a 3^ellow spot against the 



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