()2 
( \)I.()I{AI)() Kxpehiment station 
spores which is enclosed l)y the chaff of the grain. The Panicum 
millets are affected by U. panici-miliacei, which replaces the kernels 
with a black mass of spores but also destroys the chaff. The mass of 
spores is held together by a thin gray membrane. 
Both of these smuts may l)e controlled by treating the seed with 
formaldehyde (1-40) in the usual manner for treating wheat. 
Millet smut on foxtail millet. (Original in Colorado Experiment Station 
Bulletin 242, by Vasey.) 
PEA 
Powdery Mildew (Erysiphe polygoni) (62) — Powdery mildew is 
common in Coloi*ado on both field and garden peas especially when- 
ever grown late in the season. The usual white cobwebby growth 
characteristic of mildews is formed. This later turns dark due to the 
formation of numerous black si)oi*e cases large enough to be seen 
with the naked eye. 
Spraying will conti'ol mildew but it is not ])ractical. Plant peas 
as early in the season as ])ossible and kee]) soil drained. Use seed 
from holds known to be free of the disease. 
