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 of Bordeaux Mixture on Late 

 Potatoes 



' Jones, L. R., and Giddings, N. J., Vt. Agr. Exp. St.i. Rpt. 20. p. 

 334 et seq., 1900-1907. 



