CHAPTER VI 



THE PRINCIPLES OF DISEASE CONTROL 



P.\i\, S. M. The Action of Copper on Leaves with Special Reference to the 



Injurious Effects of Fungicides on Peach Foliage. Tenn. Agl. Exp. Sta. 



Built. (Vol.) 15 : 21-108. pis. 1-8. 1902. 

 BURT, E. A. Resistance of Plants to Parasitic Fungi. Trans. Mass. Hort. 



Soc. (1898): 145-161. 

 CLARK, J. F. On the Toxic Properties of Some Copper Compounds with 



Special Reference to Bordeaux Mixture. Botan. Gaz. 33 : 26-48. fi%s. 



7-7. 1902. 

 HEDRICK, U. P. Bordeaux Injury. N. Y. Agl. Exp. Sta. Built. 287: 1-189. 



1907. 

 JACKSON, H. S. Development of Disease Resistant Varieties of Plants. Trans. 



Mass. Hort. Soc. (1908): 123-137. 



LODKMAN, E. G. The Spraying of Plants. 399 pp. 92 figs. 1896. 

 MILLARDET, A. De Faction des melanges de sulfate de cuivre et de chaux sur 



le mildion. Compt. Rend. 101 : 929-932. 1885. 

 SCOTT, W. M. Self-Boiled Lime-Sulphur Mixture as a Promising Fungicide. 



Bureau Plant Industry, U. S. Dept. Agl. Circular 1 : 1-18. figs, i, 2. 

 (Spray Calendars and Bulletins of the Agl. Exp. Sta.'s in the United States.) 

 SWINGLE, W. T. Bordeaux Mixture. Div. Veg. Phys. and Path., U. S. Dept. 



Agl. Built. 9: 1-37. 1896. 



I. METHODS OF CONTROL 



A proper knowledge of the life histories of parasitic fungi, ex- 

 perience in the use of spray mixtures, an adequate conception of 

 crop requirements, and a comprehension of general plant physiol- 

 ogy 7 make possible in the great majority of cases a rational means 

 of disease control. 



Eradication, prevention, or control of fungous diseases max he- 

 brought about more or less successfully by proper regard for such 

 factors as varietal resistance, seed selection, crop rotation, seed 

 treatment, application of fungicides to the growing crop, and gen- 

 eral sanitation. It is frequently necessary to combine several meth< >ds 

 of procedure in combating the attacks of a single organism, and 

 in no case should practices of general sanitation be disregarded. 



Resistant varieties. Notable instances of the resistance <>i par- 

 ticular varieties of important parasitic fungi have been brought to 



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