CONTENTS, 



Page. 



Introduction 9 



Death of the trees 9 



When are the trees dead 11 



The ''blue" wood 11 



Rate of growth of the blue color 11 



Nature of the "blue" wood 12 



Strength of the "blue " timber 13 



Lasting power of the "blue" wood 14 



The "blue" fungus 15 



Effect of ' ' blue ' ' fungus on the toughness of the ' ' blue ' ' wood 20 



Relation of the ' ' blue " fungus infection to the beetle holes 20 



Fruiting organs of the "blue" fungus 22 



Growth in artificial media 23 



Dissemination of the spores 24 



The blue color 24 



Summary 26 



Decay of the "blue" wood 26 



The "red rot" of the western yellow pine 27 



Cause of the "red rot" 27 



Conditions favoring the development of the ' ' red-rot ' ' fungus 28 



Final stages and fruiting organs 28 



Rate of growth of "red rot " 30 



Amount of diseased timber 31 



Possible disposal of the dead wood 32 



In the Black Hills 32 



In the remaining parts of South Dakota 33 



Value of the dead wood 33 



Inspection 33 



Recommendations 34 



Description of plates 38 



7 



