50 MAINE AGRICULTURAL EXPERIMENT STATION". I9OI. 



In this work, where so much Bordeaux was needed, much 

 time was saved by first preparing stock solutions. The stock 

 solutions used in this experiment were prepared in accordance 

 with the directions given on page 63. 



Bowker's Boxal, made by the Bowker Chemical Company, of 

 Boston, is a "manufactured form of Bordeaux mixture," to 

 which an insecticide (disparene or arsenate of lead) has been 

 added. Boxal differs from the usual Bordeaux mixture in that 

 precipitated copper hydrate has been added to it and it contains 

 relatively more copper and less gypsum than ordinary Bordeaux 

 mixture. This added copper hydrate did not soften upon the 

 addition of water as readily or so completely as the other part of 

 the Boxal. The directions on the package called for 5 pounds 

 of Boxal to each 50 gallons of water. Just before the first spray- 

 ing, a printed postal card was received from the firm saying, 

 "Owing to the remarkable abundance of the potato beetle we 

 are of the opinion that you will obtain the best results bv using 

 10 pounds of Boxal to 50 gallons of water." Accordingly two 

 plots were sprayed with Boxal, one at the rate of 5 pounds and 

 the other at the rate of 10 pounds per acre. If Boxal contains 

 no more copper than Bowker's Bodo,* it will take about 18 

 pounds to 50 gallons to make a mixture of the same strength 

 as the freshly prepared Bordeaux mixture used in these experi- 

 ments. 



Adler's Bordeaux mixture. This was a prepared mixture so 

 made that each gallon contained 2;4 pounds copper sulphate 

 and 2]A pounds of lime. It was used by diluting 1 gallon with 

 24 gallons of water and thus had the same strength as the 

 freshly prepared Bordeaux mixture. 



Lion Brand Bordeaux mixture is prepared by James A. Blan- 

 chard, of New York City. It is ''ready for immediate use by 

 adding 49 gallons of water to 1 gallon of the mixture. ' It is 

 put up in gallon cans which retail for one dollar each. 



METHOD OF APPLYING. 



The fungicides were applied in a hne mist or spray by means 

 of a four-rowed mechanical sprayer, fitted with a powerful hand 

 pump In the first application the machine was fitted with single 



* A manufactured form of Bordeaux mixture, which was not received 

 soon enough to be used in this experiment, but which was successfully- 

 used by a few potato growers in Aroostook county in igoo. 



