642 LABORATORY EXERCISES 



iNPLtTENCE OF SoiL FACTORS. 



Inphjence of Climatic Factors. 

 Control. 



Quaranlinc measures. 

 Spraying. 



Remedial measures (dressing wounds and soil amelioration). 

 Breeding (selection of resistant strains and crossing). 

 Eradication (burning of diseased plants, cultivation of soil by rotation ; 

 disinfection). 



Literatttre Relating to Disease and Organism. — The citations which are 

 given in this section can be arranged with reference to their importance and with 

 some view of the above outline of study. For example, papers dealing with the 

 disease in general, with the morphology of the fungus, with the method of control, 

 might be listed separately under one of the above heads. It is important for the 

 student to get acquainted with the literature of a subject; otherwise he cannot 

 appreciate what has been done in his particular field of scientific endeavor. 

 A bibliography should be made. 



