8 



thoroughly ; then add water sufficient to make up the required 

 quantity. Before using the mixture it should be strained 

 through sacking or a sieve of some kind, with about a 1-16 inch 

 mesh, to remove the coarser particles, which are liable to clog 

 the nozzle of the pump. While spraying, the mixture should be 

 kept thoroughly stirred up. 



Iron vessels should not be used in preparing this mixture. 



This formula is one fourth stronger than that recommended 

 for spraying fruit trees. 



For destroying potato bugs, Paris Green may be added to the 

 Bordeaux mixture in the proportion of one half pound to fifty 

 gallons. 



The Bordeaux mixture may be applied to the potato vines 

 with an ordinary watering pot, but one of the forms of spraying 

 pump described in Bulletin No. 19 is much to be preferred. 

 For small fields, and where the work is to be done by one man, 

 the Knapsack pump is a good form ; but for general use one of 

 the force pumps which can be attached to a barrel will be found 

 more satisfactory. Tlie pump should be provided with a nozzle 

 which will give a fine spray, the form known as the Vermorel is 

 one of the best. Spraying pumps should be brass lined. They 

 may be obtained through any hardware dealer or direct from the 

 manufacturers. W. & B. Douglas, Middletown, Conn. ; George 

 Tyler & Co., 43 South Market St., Boston ; Field Force Pump 

 Co., Lockport, N. Y. ; Nixon Nozzle and Machine Co., Dayton, 

 Ohio, are reliable firms. Blue vitriol may be obtained from any 

 druggist, and in quantity ought not to cost more than ten or 

 twelve cents, and may be obtained for even less at wholesale. 

 Twenty-five to fifty pounds for three applications per acre will 

 be required. 



The barrel with pump attached may be mounted on a cart or 

 wagon which will straddle two rows of potatoes, while the horse 

 walks between them. One man will be required to pump, and 

 another to hold the nozzle. With fifteen or twenty feet of hose 

 five or six rows can be sprayed on either side of the team, so 

 that little damage will be done in the necessary driving over 

 the field. 



H. II. LAMSON. 



