282 



DISEASES OF ECONOMIC PLANTS 



the early and late blights, and the Colorado beetle or " po- 

 tato bug." 



The gains from spraying potatoes with Bordeaux mixture, 

 as shown in trials at the Vermont Experimental Station,^ 

 begun in 1891 by Jones and extending over seventeen 

 years, are shown below : — 



Gains from the Use op Bordeaux Mixture on Late 

 Potatoes 



1 Jones, L. R., and Giddings, N. J., Vt. Agr. Exp. Sta. Rpt. 20, p. 

 334 et seq., 1906-1907. 



