New York Agricultural Experiment Station. 205 



On August 20, attention was attracted to the slightly smaller 

 size of plants in the lime-sulphur rows as compared with those 

 in the bordeaux rows and the checks. This difference became 

 quite marked on August 2i5 when it could be plainly seen that 

 the plants in the lime-sulphur rows were smaller in size, not as 

 spreading or bushy, and the stems appeared smaller, when com- 

 pared with plants in the other rows. This difference was 

 noticeable throughout the remainder of the season. 



On September 3, late blight {Phytophthora infestans), which 

 caused much tuber rot later in the season, was found to be pre- 

 valent in a nearby potato field, but it did not appear in the 

 experimental field until September 25 when it was found on 

 the check rows upon a number of living plants that still remained 

 in those rows, and also upon the few living plants that still re- 

 mained in the lime-sulphur rows. The number of living plants 

 was considerably smaller in the lime-sulphur rows than in the 

 check rows. All of the plants then alive in both rows were soon 

 killed by the combined attack of the tipburn and the blight. 



The late appearance of the Phytophthora blight in the field was 

 perhaps due to the somewhat small growth of potato foliage 

 caused by a lack of fertility in the soil. In nearby potato fields 

 the foliage blight was prevalent and followed by a severe rotting of 

 the potato tubers. A very little early blight (Macrosporium 

 solani) occurred in September. 



The superior condition of the bordeaux rows first became ap- 

 parent about August 20 and the difference became conspicuous 

 during the latter part of the season. On October 17, the date 

 upon which they were harvested, the bordeaux rows still con- 

 tained several living plants. They outlived the limersulphur 

 and check rows over two weeks. 



YIELDS. 



The following table shows the kind of treatment, also the yield 

 as determined by carefully sorting and weighing each row 

 separately at the time of digging. 



