A Stem Blight oe Field and Garden Peas 
43 
Fig. 2.—Chains of Ps. pisi from 24-hoiir agar culture. 
Stained with carbol fuchsin. Xiooo. 
Fig. 3. —Agar plate culture of Ps. pisi, showing surface and 
deep colonies. Five days old. Actual size. 
Fig. 4. —Surface colony from agar plate. Five days old. 
Xioo. 
Fig. 5.—Deep colonies of Ps. pisi from ag'ar plate, 
old. Xioo. 
COLORED PLATE. 
Five days 
Leet-hand Figure. —Characteristic yellow, olive green, 
watery stipules and stem; recent infection. 
Middle Figltre. —Diseased pea vine with olive green, watery 
stem and healthy shoot coming* from below diseased portion. In¬ 
fection active. 
Right-hand Figl^re. —Pea vine in advanced stage of the 
disease. 
