384 Report of the Mycologist of the 



rods, spraying can be done for less than |4 per acre. In our 

 experiment the ^^ater was pumped by hand and hauled from 40 

 to 88 rods, which consumed considerable time. We have also 

 placed the value of labor, for both man and horse, a trifle high. 

 Thirty cents per hour or three dollars i>er day for a man and 

 horse is luore than they will cost the average farmer. 



The total quantity of Bordeaux mixture used in the experiment 

 was 1,975 gallons, or 46 gallons per acre for each application. 

 The quantity of Bordeaux mixture Tequired depends largely upon 

 the kind of nozzle used. The nozzle should throw a mist-like 

 spray, the finer the better. Nozzles which throw a coarse spray 

 waste the Bordeaux mixture. Deming-Vermorel nozzles were 

 used in the experiment. 



Treatment of the unsprayed plats. — As previousiy stated, a few 

 rows of each variety were left unsprayed in order that the benefit 

 from spraying might be definitely determined by comparing the 

 yield of the sprayed plat with the yield of the unsprayed plat. 

 These unsprayed plats were treated as the aveiage farmer would 

 treat his crop. 



On Long Island it has become very popular to combat the 

 Colorado potato-beetles with Paris green applied dry by means 

 of Leggett's powder-gun. The Paris green is diluted with a con- 

 siderable quantit}' of flower or air-slaked lime, preferably the 

 latter, since the lime prevents the Paris green from " burning " 

 the foliage. So we planned to treat the unsprayed or check 

 plats in this manner. 



The owner of the field was asked to notify us when he thought 

 it was necessary to begin fighting the Colorado potato-beetles. 

 On June 26 he notified us that the potato beetles were beginning 

 to do damage to the unsprayed plats and shonld be poisoned. 

 The same day we applied Paris green with Leggett's powder-gun 

 under what we considered favorable circumstances. On the 1.09 

 acres there were used 1.5 pounds of Paris green mixed with 13 

 pounds of air-slaked lime. There was very little wind and the 

 morning had been misty so that the foliage was wet. The Paris 

 green and lime adhered well to the foliage and most of the 

 beetles were killed. 



