26 BULLETIN 1046, U. S. DEPARTMENT OF AGRICULTURE. 
RESISTANCE TO LEAF RUST. 
Observations (37) made at Manhattan, Kans., during the 5-year 
period from 1915 to 1919, inclusive, and field notes recorded in all 
sections of the State in 1919, 1920, and 1921 show that these three 
pure lines of Crimean wheat are remarkably resistant also to leaf 
rust (Puccinia triticina) as it occurs in Kansas. Mains and Jackson 
(27) also have found these three varieties to be very resistant to leaf 
rust under field conditions and where the plants were approaching 
the heading stage. According to these workers, however, seedlings 
of these varieties do not prove to be resistant to leaf rust when - 
inoculated and maintained under greenhouse conditions. 
The resistance to leaf rust has been manifested also in experimental 
field sowings made in the States of Alabama, California, Missouri, 
North Carolina, North Dakota, Oregon, South Dakota, Tennessee, 
Texas, Virginia, and Wisconsin, and also in New South Wales, 
Australia. Present knowledge of the leaf-rust problem and the 
records from a wide range of sowings subjected to severe epidemics 
of leaf rust indicate rather definitely that Kanred, P1066, and P1068 
will maintain this high degree of resistance under a wide range of 
conditions. It should not be supposed, however, that the resistance 
of these varieties to leaf rust will be absolute under all conditions or 
in the presence of all the biologic strains of leaf rust which may exist. 
AGRONOMIC VALUE OF KANRED WHEAT. 
Kanred wheat presents a unique combination of desirable agro- 
nomic characters, a fact which is of even greater significance than its 
resistance to rusts. Jardine (19) described the origin and history 
of Kanred wheat and called attention to its higher yield, earliness, 
and cold resistance. 
Call and Salmon (6) state that “at Manhattan, the average pro- 
duction of Kanred has been 4.5 bushels per acre more than Turkey 
and 4.7 bushels more than Kharkof.” It has outyielded these 
varieties in every season but one and in that season (1914) practically 
equaled the others. Salmon (36) presents further experimental data 
on the superiority of Kanred and gives statements regarding the 
value of Kanred from a large number of farmers who have grown 
the new variety. ; 
It is estimated that at least 1,500,000 acres were sown to Kanred 
wheat in Kansas in the fall of 1920, and it is expected that within a 
few years this variety will occupy a large percentage of the hard 
winter-wheat acreage of Kansas. If the area sown to Kanred should 
reach 7,000,000 acres and the yield should be increased 3 bushels 
per acre, with wheat selling at $1 per bushel, other factors re- 
maining unchanged, the annual value added to the Kansas wheat 
