10 Ayririiltiiral Experiment Station Research RuUetin 
Plant Disease Survey show that, up to January 1, 1918, F. 
tracheiphilum has been reported as being productive of losses to 
cowpeas ranging from 2 to 100 per cent in Indiana, ^lissouri, 
iUississippi, Louisiana, Texas, Oklahoma, Georgia, Florida, North 
Carolina, South Carolina, Virginia, Arkansas, and Tennessee. 
These stales are blackened in the accompanying map (hg. 1). 
SYMPTOMS 
In 191G, soy beans were planted during the last two weeks in 
]\[ay. This is somewhat later than usual, being due to the late 
season and a period of drought. Alien the plants were I weeks 
old, they had attained a height of 2 to 3 dm. and were apparently 
still free from disease. The disease was first observed on July 25, 
Avheii the affected plants Avere about 8 Aveeks old. Symptoms of 
the trouble could jirobably luiA^e been found a Aveek or tAvo earlier. 
Afl'ected jilants, all of the same age but varying in height from 
2 dm. to 1 meter, Avere obsein^ed on the 25th. The fungus is 
belioA'ed to Inn^e stunted these small plants. In no case has the 
disease been observed to occur on seedlings under held conditions. 
In sand inoculated Avith pure cultures, liOAveATU-, a number of 
seedlings became diseased as described later in this paper. 
In 1917, soy beans Avere planted in the same held on April 2G. 
The Aveather Avas cool Avith considerable rain for the folloAving 
Aveek or ten da}^s so that on May 27 the majority of the plants 
had onlv just broken thru the surface of the soil, some Avere not 
yet up. and some Avere from 10 to 12 cm. in height. Examination 
of a feAv of the plants from a number of the roAvs did not shoAv 
injury that could be attributed to Fiisari}nn. On June 12 some 
of them Avere 15 to 25 cm. in height and infected plants Avere 
found in many of the I’ows. On »June 2(> the jhants Avere 8 Aveeks 
old and from 3 to 5 dm. in height. ^lany Avere stunted by this 
tiiiH*, partly because of the action of Fusarinm and j)artly because 
of iKMiiatodc's. Rhi'Oefonia. and other causes, so that only by 
r(‘mo\ing snsp(‘ct(‘d ])lants could it be certain that they Avere 
dis(*as(‘d and that Fasarhun Avas (luite generally present thruout 
lhc‘ ll(‘Id. Plants AV(‘re found Avithout any of the external symp- 
toms d(‘scril)ed bidow, except the dAvarling, the xylem areas of 
whicli W(*r(* l)rowni‘d wcdl up (he stiMu. Py rhdy 20 llu‘ disea.se 
was pri'.stMit tluMioiit tlu‘ li(‘hl and many })lants Avere in advanced 
stages of 1 h(* tlis(‘as(*. 
(’oinparing lh(‘ conditions in 1917 Avith those of 19K» in the 
saiiK' li(‘ld, oiu‘ linds that at the end of 8 AA'eeks the plants Avere 
smaller in 11M7 hut tin* dis(*as(* Avas more gi*iu*ral and more ad- 
vanc(‘d in its injury to the individuals. 
