EXPERIMENT STATION BULLETIN'S. 



293 



That this will give good returns can be seen from the fact that it is 

 not uncommon to have from one-half to three-quarters of the crop de- 

 stroyed by blight and rot, while four applications of Bordeaux will 

 almost prevent it. 



BORDEAUX MIXTURE AND ITS APPLICATION. 



The formula for Bordeaux mixture and the method of preparing it is 

 the same as for use upon fruit trees. Three or four pounds of sulphate 

 of copper (blue vitriol), five or six pounds of lime and fifty gallons of 

 water, together with eight or ten ounces of Paris Green, or two or three 

 pounds of arsenate of lead, will be effectual against both the blight and 

 beetles. In preparing the Bordeaux mixture, the lime should be care- 



FiG. 9. Spraying Potatoes. 



fully slaked and the sulphate of copper dissolved by suspending it over 

 night in a coarse bag just beneath the surface in a barrel partly filled 

 with water. Twenty-five pounds can readily be dissolved in twenty-five 

 gallons of water. To prepare the mixture, take three or four gallons of 

 the copper sulphate solution and, after diluting it to twenty-five gallons, 

 add five or six pounds of lime which has also been diluted to twenty- 

 five gallons. As they are poured together the mixture should be stirred 

 so as to favor chemical combination. 



POTATO SPRAYING OUTFIT. 



When only a small area is to be sprayed it will answer fairly well 

 if an ordinary barrel spraj^er is used but there should be a horizontal' 

 spraying spar, at the rear of the wagon or cart upon which the barrel 

 is placed. This should be connected with the pump, by means of a hose 



