Journal of Agricultural Research 



exposed. In other words, but 2 tubers of 16 inoculated were rotted. 

 From the two affected tubers F. solani was recovered once, F. radicicola 

 was isolated twice, and F. oxysporum once. 



F. martii 186; isolated from Pisum sativum in April, 1910. Sent to 

 Dahlem, Germany, by Miss J. Westerdijk, of Amsterdam, Netherlands, 

 as F. vasinfectum, var. pisi Van Hall ; determined by Dr. Wollenweber. 

 Culture used, 2-months-old pionnotes on potato cylinder. None of the 

 16 tubers inoculated was affected after 51 days' incubation at an average 

 temperature of 21.5° C. 



F. monilijorme 3321 ; isolated on November 3, 1914, in association with 

 F. radicicola 3319 and Mucor sp. 3320 from a "leaky" (see footnote, 

 p. 190) tuber from Moorland,* Cal. Culture used, iK -months-old cotton 

 stem culture. Of the 16 tubers inoculated, none was rotted after 41 days 

 at an average temperature of 21.5° C. 



Verticillium alho-atrum I'/iy and 2784. The former strain was isolated 

 by Dr. Wollenweber in September, 191 2, from the discolored vascular 

 bundles of wilting okra plant from Monetta, S. C. Strain 2784 was 

 isolated on August 28, 1913, from a wilting potato plant of the Rural 

 variety from Greeley, Colo. After an incubation period of 25 days at an 

 average temperature of 25.5° C. the tubers of the Netted Gem and Idaho 

 Rural varieties inoculated with the respective strains remained sound. 

 The tubers of the People's variety inoculated With these strains were 

 badly rotted in both cases. The organisms could not be recovered, but 

 F. vasinfectum was isolated. Tubers inoculated with the latter species 

 were in the same compartment. 



Sporotrichum flavissimum 1455; isolated and determined by Dr. Wol- 

 lenweber in May, 191 2; from a hollow Irish Cobbler potato from Arling- 

 ton, Va. Culture used for inoculation, 2-weeks-old potato cylinder. 

 Of 12 tubers inoculated with the organism and incubated for 20 days at 

 23° C, none was rotted. 



Miicor sp. 3320; isolated on November 3, 1914; from same source and 

 in association with F. moniliforme 3321 and F. radicicola 3319. Culture 

 used, 2-months-old fruiting culture on cotton stem. Two tubers out of 

 16 inoculated with this organism were rotted after incubating for 51 

 days at 21.5° C. From these the organism was recovered by one reiso- 

 lation, and F. oxysporutn and F. vasinfectum were isolated each once. 

 Tubers inoculated with the latter species were in the same compartment. 



Rhizoctonia sp.; for inoculation results with this organism see p. 197. 



In Table VI are given the results of the inoculations with the species 

 of Fusarium and other potato-inhabiting organisms. 



