Y2 



Bulletin 186. 



impossible to determine wlietlier the plants had suffered any injury 

 from its presence. Unfortunately, the potato tops were nearly all 

 dead at that time, the varieties grown in that locality being almost 

 all early varieties. A few tubers were examined but nothing found. 

 On this visit we also had the opportunity of examining some diseased 

 potato stems collected on Staten Island by Miss Emma Sirrine, and 

 found them infested with Rliizoctonia. A few days later Mr. 

 Kolfs found it at Mattituck, Cutchogue and East Hampton, in the 

 eastern part of Long Island. Here it occurred on late potatoes, 



20. — A potato tuber sliowing tlie scleroiid of the Rliizoctonia. 



(^ natural size.) 



and, in one instance at least, tliere was good evidence that it had 

 killed a considerable numl)er of plants. It was also found at Wad- 

 ing River. There has been nuich complaint about the premature 

 dying of potatoes on Long Island the past season. What part 

 Rhizoctoiiia played in this trouble is not certaiidy known, but prob- 

 ably it was not an important one. Later, the liJiizoctonia was 

 found on potato stems in many fields about Geneva, Phelps, Lodi 

 and Oaks Corners. 



On August 3 while peeling some scabby potatoes for potato agar 



