New York Agricultural Experiment Station. 119 



over, the two Khizoctonia-infested plants were potted and placed 

 in one of the Station greenhouses where they thrived and never 

 after showed any ill effects from the presence of the Rhizoctonia. 



About a year after this experience, interest in the violet 

 RMzoctonia was revived by Mr. Rolfs' discovery of a case of de- 

 structive violet stem-rot in a greenhouse at Geneva. Here the 

 affected plants were abundantly infested by Rhizoctonia. At 

 about the same time we found it on violets at Floral Park. The 

 plants were in small pots. Some of them had etem-rot^, while 

 on others only the bases of the petioles were rotten. The rotten 

 parts frequently contained Rhizoctonia. 



Thus it appears that Rhizoctonia occurs not infrequently on 

 violets, but whether as a parasite or only as a saprophyte can 

 not now be stated. 



other hosts. 



In addition to the occurrence of Rhizoctonia as an apparent 

 cause of diseases of the host plants already mentioned, there are 

 several other plants upon which we have occasionally found this 

 fungus. For the sake of brevity, we will condense the observa- 

 tions upon these, and bring them together under a single head- 

 ing, deferring their more extended discussion until further ob- 

 servations and studies have been made upon them. 



Rhizoctonia has been found on the roots and trunk of a dead 

 cherry tree from Wright's Corners; as a damping-off disease of 

 white pine and cucumber seedings; on damped off cuttings of 

 begonia, coleus, verbena, hydrangea, hardy candytuft, and mam- 

 moth sage at Floral Park, N. Y.; on mature plants of phlox and 

 pyrethrum at Floral Park; and on young plants of snap dragon 

 at Geneva, Mr. Rolfs has observed it on the raspberry, lamb's 

 quarters (Cltenopodium album), tumble weed (Amarontus alhus), 

 pigweed {Amarantiis rclrofiexits), and on decaying squash stems at 

 Geneva. 



'Violet stem-rot is a complex rlisease not well understood. The fungus 

 ThU'kiria baslcola Zopf is general] j' accepted as being tbe cause of it. See 

 Thaxter, R., Fifteentli Ann. Rep. Conn. Agr. Exp. Sta. (1891): 1G6-1C7. 



