558 Journal of Agricultural Research vol. vi, no. i 3 



film of water, such as may be supplied by a fine spray from an atomizer, 

 must be provided for one or two days, after which the rot will continue 

 independently. That F. solani smeared on a moist cut surface of dasheen 

 develops as a wound parasite and not a saprophyte is evident from the 

 fact that other fungi, such as F. oxysporum Schlecht., and F. caudatum 

 Wollenw. isolated from dasheen, when similarly used produced no decay. 



INOCULATION OF COLOCASIA ESCULENTA FROM TRINIDAD 



On January 21, 1915, six tubers were inoculated in a moist chamber 

 by smearing spores of F. solani from dasheen on the cut surface. A soft- 

 rot started in two days and by January 27 it had penetrated half an inch. 

 The causal fungus was recovered from each. The checks, six in number, 

 remained sound. On January 24, six tubers were inoculated and by 

 February 1 1 all were completely decayed and F. solani was recovered from 

 five. The plate in which the other planting was made was overrun with 

 a species of Rhizopus. The checks, six in number, were sound. Six 

 tubers inoculated on February 6 were completely rotted in 9 days. Six 

 inoculations made on March 1, 191 5, in the usual way were all rotted on 

 March 9. No isolations were made. The checks, four in all, remained 

 sound. On March 6 four tubers were inoculated into a cut surface at the 

 end of the tuber and two on an unbroken surface at the side. Those in- 

 oculated into a wound rotted freely; the others remained sound. 



On February 16 six tubers were inoculated with F. solani from Irish 

 potato, and in nine days the tubers were well decayed, the rot being 

 identical with that produced by tubers inoculated with the same organism 

 from dasheen. The checks, six in all, remained sound. On March 1 six 

 tubers were inoculated with F. solani from Irish potato, and in nine days 

 all the tubers were mostly but not completely rotted. The four checks 

 remained sound. 



INOCULATIONS OP COLOCASIA ESCULENTA FROM MANCHURIA 



This is a variety of taro from Manchuria with small tubers about 2 

 inches long and 1 inch in diameter. On March 1 twelve of these tubers 

 were inoculated with F. solani from dasheen. In seven days all the 

 tubers were completely decayed, and the causal organism recovered 

 from each. The checks, six in number, remained sound. An exami- 

 nation of the decayed specimens showed that, while the middle lamella 

 was largely destroyed, the fungus did not to any extent invade the cells. 



INOCULATIONS OF XANTHOSOMA SAGITTIFOLIUM 



On March 1 six tubers were inoculated with F. solani from dasheen. 

 and in seven days the tubers were well decayed but not completely, the 

 rot being identical with the rot of Colocasia esculenta produced by the 

 same organism. F. solani was recovered from each tuber in pure culture. 

 The checks, four in number, remained sound. 



