438 
Journal of Agricultural Research 
Vol. VIII, No. ii 
tions. Pure cultures of the two strains were used in certain of the 
experiments and inoculum from the natural host in others. 
(7) Infection probably occurs through the roots, but nematodes appear 
not to increase the percentage of blight materially. 
(8) The character of the soil appears to influence the percentage of 
infection, since the largest proportion of diseased plants appeared in 
coarse sandy soil. 
(9) Blight or wilt of soybeans is therefore due to Fusarium tracheiphi- 
lum Smith. 
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( 5 ) -- 
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