774 
Journal of Agricultural Research voi. xxm. No. « 
Table II .—Percentage of rosette disease in various crops planted on infested land, Granite 
City , III., in igig 
Crops. 
Percentage 
of roestte 
disease. 
Crops. 
Percentage 
of rosette 
disease. 
Winter wheats listed in Tables 
VII and VIII (1920-21). 
Marquis spring wheat. 
Durum spring wheat. 
Illinois No. 1 spring wheat.... 
Red Fife spring wheat. 
Spring emmer. 
Winter emmer. 
Spelt. 
Hanna barley. 
Hannchen barley .: . 
Svanhals barley. 
Wisconsin Pedigree barley. 
Rosen rye. 
Common rye. 
Spring rye. 
Texas Red oats. 
Big Four oats. 
Iowa 105 oats. 
Sixty Day oats. 
Iowa 103 oats. 
Com (maize). 
Kafir... 
Feterita. 
Amber sorgo. 
Milo. 
Sudan grass.. 
o to 98 
? 
? 
? 
? 
o 
o 
o 
? 
? 
? 
> 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
Buckwheat. 
Flax. 
German millet. 
Hungarian millet. 
Barnyard millet (Billion Dol¬ 
lar grass). 
Timothy. 
Awnless rye-grass. 
Italian rye-grass. 
English rye-grass. 
Bermuda grass. 
Crested dog’s-tail. 
Meadow foxtail. 
Meadow fescue. 
Red fescue. 
Red top. 
Tall meadow oat-grass. 
Kentucky bluegrass. 
Spring vetch. 
Alfalfa. 
Sweet clover. 
White clover. 
Cowpea. 
Navy bean. 
Rape... 
Sunflower. 
Giant beggarweed. 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
Certain varieties of spring wheat and of barley develop symptoms 
resembling the rosette disease of winter wheat, but there are certain 
differences which make it questionable whether these crops are affected 
by the disease. 
DESCRIPTION OF THE DISEASE. 
During the first year’s investigations it was not possible to make a 
complete study of the symptomatology of the disease, owing to the fact 
that the work was not started until May, fully seven weeks after the 
disease made its appearance in the spring. At that time field spotting 
was rather evident, and diseased plants showed a characteristic stunted 
development and the production of an excessively large number of sec¬ 
ondary tillers, giving the plants a rosette appearance. These were the 
field and plant symptoms which attracted attention to the disease and 
which made it conspicuously different from other wheat diseases here¬ 
tofore definitely known in this country. A rotting of the underground 
portions of tillers had started, but this condition was suspected to be a 
secondary effect rather than a primary cause, as observations, made 
earlier in the season (April 21) by A. G. Johnson, had not revealed a 
distinct rotting of the tissues in all cases, even though conspicuous signs 
of the disease, dwarfing and excessive tillering, were noted by him. 
In 1920 the field studies were begun in the latter part of March, just 
at the time wheat plants were beginning to show signs of spring develop¬ 
ment. These studies were conducted in experimental plots located near 
