476 ILttinors NaturAL History Survey BULLETIN Vol. 26, Art. 6 
In fig. 17B, brown rot isolates 50-7 50-22 was intermediate-raised. Isolate — 
and 50-22 are compared. Isolate 50-7 50-22 was the more virulent in laboratory 
was of the intermediate-appressed type; and greenhouse tests. The pH curves for — 
pH 
9.0 
—_—----8-._ 
SP techie ati 
8.0 7 
Isolate 50-25, i@ 
2 
_ Isolate 47-1\2 
7.0 -* 
5.0 ae 
4.0 
fe) 10 20 30 40 50 60. 
TIME IN DAYS 
Fig. 16.—Progressive changes in pH produced in Tochinai liquid by four brown rot isolates” 
of Fusarium. : 
