398 Report of the Mycologist of the 



The experiment was repeated on seven other rows of potatoes 

 53G feet long, planted on clover sod. The treatment was the 

 same and the result was as follows: 



The double-sprayed row yielded 4G3f lbs. merchantable tubers, 

 22 lbs. culls. 



The six single-sprayed rows averaged 4031^ lbs. merchant- 

 able tubers, 21 lbs. culls per row. 



Difference in yield of merchantable tubers, 59| lbs. per row or 

 27 bu. per acre. 



To recapitulate, potatoes sprayed five times with Bordeaux mix- 

 ture at the rate of 100 gallons per acre outyielded potatoes sprayed 

 at the rate of 50 gallons per acre. The amount of the difference 

 was in one case 15 bu. 13 lbs. of merchantable tubers per acre, 

 and in another case, 27 bu. of merchantable tubers per acre. 



As in the experiments at East Williston, the fight here was 

 chiefly against flea-beetles and Colorado potato-beetles. There 

 was very little disease of any kind to contend with. 



The result of this experiment confirms us in a previously 

 formed opinion based upon general observation, nameh;, that 

 heavy applications of Bordeaux mixture give much better results 

 than light applications, and that it will pay to use at least three 

 nozzles per row in the last two sprayings. 



A TEST OF THE HUDSON SPECIAL BORDEAUX 

 SPRAYER. 



Quite recently Long Island potato growers have begun to take 

 considerable interest in the spraying of potatoes, and one of the 

 greatest obstacles to progress in the practice of spraying is the 

 difficulty of obtaining suitable machinery for applying the Bor- 

 deaux mixture. For gardens and small fields of from one to two 

 acres the knapsack sprayer answers very well; but for the large 

 fields of those farmers who make potatoes their chief farm crop, 

 the knapsack is too tedious. In our opinion the most economical 

 method of spraying these large fields is by means of a home-made 

 outfit similar to the one shown in Plate XIV. There are, however, 

 many farmers who object to the labor required to operate such an 



