478 Inuinois NaTturAL History Survey BULLETIN Vol. 26, Art. 6 : 
and 47-3 was raised. Isolate 47-3 was the the laboratory. Isolate 47-2 produced the | 
more virulent in greenhouse tests; +7-2 greater amount of acid during early © 
was slightly more virulent than 47-3 in growth and its pH readings remained — 
Isolate 47-3 
9.0 
i - == —— 4 -~ 
ges 
7 1 
7 
8.0 a 
4 
, 
Isolate 47-8,’ 
7 
7.0 ye 
_a# 
ee Isolate 46-12 
oe 
Bs 
R, 
6.0 : y 
\ 
< “A 
\ / 
x / 
5.0 * 
B 
4.0 ‘ 
) 10 20 30 40 50 60 
TIME IN DAYS 
Fig. 18.—Progressive changes in pH produced in Tochinai liquid by four basal dry rot — 
isolates of Fusarium, 
