BULLETIN 1361, U. S. DEPARTMENT OF AGRICULTURE 
FIG. 2. — A, Portion of a healthy rye leaf. B, C, D, 
Portions of rye leaves showing mosaic (X 2) 
stunted plants. This 
rosette condition is espe- 
cially severe in Harvest 
Queen (also known as Eed 
Cross and Salzer's Prize- 
taker) and several other 
varieties which are listed 
in other publications. 3 
The leaves of rosetted 
plants eventually become 
dark green in color, thus 
masking the mosaic mot- 
tling. However, cell in- 
clusions have always been 
found when such plants 
were examined. Also 
when such plants send out 
new tillers mosaic has 
been found to occur on the 
new leaves of these tillers 
before the dark-green col- 
oration develops. 
Currell wheat seems 
unusually susceptible to 
severe leaf mottling, and 
observations covering sev- 
eral years indicate that 
mosaic frequently pre- 
vents the normal develop- 
ment of this variety. It is 
not uncommon to find in- 
fected Currell plants 
which are almost yellow in 
color, and in most cases 
such plants are rather 
stunted. This latter con- 
dition develops after the 
early spring period and is 
not confused with the ro- 
sette stage, which develops 
in some varieties early in 
the spring. 
A LEAF MOTTLING NOT 
MOSAIC 
Other types of mottling 
occur on wheat which may 
be confused in some cases 
with mosaic. Figure 3 
shows a type of leaf mot- 
3 II. H. McKinney. Op. cit. 
R. W. Webb, and G. H. Dungan. Op. cit. 
R. W. Webb, C. E. Leighty, G. H. Dungan, and J. B. Kendrick. Varietal resistance in 
winter wheat to the rosette disease. In Jour. Agr. Research, vol. 26, pp. 261-270. 1923. 
