~ 
TESTING BREEDI 
NG LINES OF OATS IN T 
Photo 1 
Seeds of each line to be tested are 
planted in individual pots. At about 
the three-leaf stage, the plants are 
sprayed in late afternoon with dis- 
tilled water. 
Photo 2 
A shower of rust spores from heav- 
ily-rusted oats are dusted on the 
moistened leaves. Mixed cultures, 
including all prevalent races, are used 
in these tests. 
Photo 3 
The inoculated plants are covered 
over-night with wet cloths to main- 
tain the necessary relative humidity 
—above 99'2% is required for in- 
fection. 
[16] 
