There usually comes a time, in the
progress of any given crop of wheat,
when farmers and elevator men, and
others who are interested as growers
or speculators, become apprehensive
in regard to the outcome of that crop.
Usually^ this occurs in early July,
when the first reports of wheat rust
appear in the papers. The rust is
usually present, however, in the fields
some time before the reports appear.
In fact the rust is almost always pres
ent, and can easily be detected in the
air, at almost any time, by filtering
the spores out of the air and examin
ing them under the microscope. One
will find spores of the rust in the air
at all times from early spring to late
in the fall.
The questions of vital importance
to the farmer are, first, how can he
tell if the rust will be severe, and
second, what can he do to prevent it.
