PARASITIC RHIZOCTONIAS tN AMERICA 315 



FIG. 9. GARDEN BEET INOCULATED WITH Rhizoctonia Solani FROM CARNATION, 

 SHOWING A LATE STAGE OF INFECTION (Experiment 8) 



Damping-off of sugar-beet seedlings has been reported by Selby, 108 

 from Ohio, and by Smith, 113 from California. 



BEGONIA 



Mr. H. W. Anderson in 1911 found a number of begonia cuttings in 

 the floricultural greenhouses that were damping off badly because oif 

 Rhizoctonia infection. The symptoms were similar to those described 

 for cuttings of alternanthera. 



Damping-off of begonia cuttings has also been observed in New 

 York by Duggar and Stewart, 32 and in North Carolina by Stevens and 

 Wilson. 122 



BLACKBERRY, Rubus sp. 



Root disease of blackberry and raspberry caused by Rhizoctonia 

 has been reported only once in this country. Paddock 70 of Colorado, 

 who studied this disease, described it as follows: 



' ' The trouble was first noticed by the foliage becoming light green or yellow- 

 ish. Later in the season leaves on occasional plants began to curl and shrivel as 

 parts of the plant beloAV ground were attacked, but the greatest injury occurred on 

 the canes above the crown. Here the bark was discolored and shrunken from the 

 crown to the surface of the soil, or a short distance above. The fungus grew out 

 within the bark, destroying the tissues, and interfering with the movements of 

 plant food. The injury commonly extended around the cane, and when it became 

 deep enough to cut off the supply of moisture and food, the plant died. ' ' 



BUCKWHEAT, Fagopyrum esculentum 



In 1911 Stevens and Wilson 120 ' 121 mentioned a serious outbreak of 

 Rhizoctonia on buckwheat in the western part of North Carolina. No 

 description of the disease was given. 



