794 
Journal of Agricultural Research 
Vol. XXIII, No. io 
A few of the varieties which showed susceptibility in 1920 did not show 
the disease in 1921. This occurred only among varieties showing low 
percentages of the disease in 1920. It is possible that the varieties show¬ 
ing the small percentage of infection were mixtures, while in those 
varieties showing high variations in the percentages of disease and non¬ 
susceptibility a genetic relation existed. This latter conclusion is based 
upon results obtained in selections studied in 1920-21 by the writer. 
In all the experiments it has been found that certain plants within the 
Harvest Queen (Salzer's Prizetaker) variety (susceptible) always survived 
or escaped the rosette disease and that such plants showed the same 
general agronomic characters as the varietal type. At first it was thought 
that these were accidental escapes, but upon selecting the heads from 
such plants and sowing the seed from these on infested land (PI. 8, A, a) 
100 per cent resistence was obtained in all resulting plants and the head 
and kernel type remained true. 
Further experiments are necessary to determine the resistance and 
susceptibility of additional varieties and to complete the study of many 
of the varieties and selections already tested. 
It is evident from the results of the trials that the Harvest Queen 
(Salzer’s Prizetaker and white-chaffed Red Cross), Illini Chief, Velvet 
Chaff, Missouri Bluestem, Niagara, and Indiana Swamp varieties are 
very susceptible to the disease and should not be grown in any of the 
districts where the rosette disease occurs. 
The variety grown in central Illinois under the name Salzer’s Prize- 
taker has white chaff and red kernels, and it is this variety which is sus¬ 
ceptible. The original Salzer’s Prizetaker was a variety with brown 
chaff and white kernels. This latter variety is identical with Gold Coin 
and Gold Coin (Junior No. 6), as listed in Table VIII, which have been 
found immune from the disease. 
The susceptible variety Harvest Queen, known locally as Red Cross in 
central Illinois, also has white chaff and red kernels and is identical with 
the susceptible Salzer’s Prizetaker variety. True Red Cross has red chaff 
and is a distinct variety grown to some extent in the eastern United 
States under the name of Red Cross. This variety was tested in 1921 
and found to be resistant to rosette disease. All these Salzer’s Prizetaker 
and Red Cross varieties are beardless. The variety known as Harvest 
Queen is supposed to be the same as the susceptible white-chaffed “ Red 
Cross” variety. Harvest Queen is grown in the Missouri River Valley 
in eastern Kansas. 
Certain of the resistant varieties are extensively grown in the infested 
area in Madison County, Ill., and the writer has made rather extensive 
observations on such varieties growing under farm conditions. Varieties 
which have been observed to maintain their resistance and show indica¬ 
tions of immunity are Early May, Red Wave, and Jones Fife. While 
all of these are good yielding varieties in central Illinois, it is doubtful if 
they come quite up to Harvest Queen (Salzer’s Prizetaker and white- 
chaffed Red Cross) in all respects. The latter variety is a favorite among 
farmers who do not have the rosette disease on their farms. This variety 
stands the winter well, is very well adapted to the less fertile soils, yields 
well, and produces grain of very high quality. It is hoped that the re¬ 
sistant selections which have been made from Harvest Queen (white- 
chaffed Red Cross and Salzer’s Prizetaker) will retain all of the good 
qualities found in the variety and that the resistance to the rosette 
disease will be found to be stable. 
