328 BULLETIN No. 189 [June, 



Iii 1905 Rolfs 95 reported the presence of the perfect stage, Cor- 

 ticium vagum B. & C., on lettuce from Florida. 



Lobelia erinus (Single Blue) 



The lobelia plants in the floricultural greenhouses in 1914 were 

 small and sessile, and covered the tops of the pots in which they were 

 growing. In June a number of them began to die. On close exami- 

 nation, strands of R. Solani could be seen spreading thru the mass of 

 plant material. The low-lying leaves afforded a good hiding place 

 for sow bugs, and no doubt they helped in carrying the fungus from 

 one pot to another. Attacks of Rhizoctonia on other varieties of lobelia 

 have been observed in the greenhouses a number of times. 



ONION, Allium sp. 



A culture of Rhizoctonia isolated from onion seedlings was ob- 

 tained from Cornell University by Mr. H. W. Anderson in 1911. Since 

 that time the author has worked with this strain both in the laboratory 

 and in the greenhouse. From its morphological and physiological 

 behavior, it must be classed as distinct from the other strains. 



Dr. I. C. Jagger states in a letter that he first isolated this form 

 from onion on May 29, 1911, from seedlings growing on muck soil in 

 New York. He found that the Rhizoctonia mycelium was always con- 

 fined to the first, or seed, leaf and that damping-off ceased as soon as 

 the second leaves had developed. 



PANSY, Viola tricolor 



During the fall of 1913 pansy plants were placed in a solid bed, 

 in the floricultural greenhouse, as a border for sweet peas. At that 

 time some of the sweet-pea plants died, and eventually a culture of R. 

 Solani was obtained from them. The following April several pansy 

 plants in the vicinity of the spot where the sweet peas had died became 

 diseased and later died. A culture showed the trouble to be due to 

 Rhizoctonia. Later a large number of the plants in the row died. The 

 fungus attacked the plant at the crown and caused a rapid rot. The 

 prostrate branches, the petioles of the leaves, and even the leaves them- 

 selves were also rotted in a characteristic fashion. The strands of the 

 mycelium could easily be seen ramifying between the rotting mass 

 arid the soil. 



PLANTAIN, Plantago aristata 



Diseased plants of plantain were found during June, 1914, in 

 inoculated sections in one of the floricultural greenhouses. The 

 mycelium of R. Solani was present around the bulbous base of the 



