104 SEVENTEENTH Report STATE ENntomoLocist oF MINNESoTA—1918 
the first crop or pasturing it lightly in the spring has been recom- 
mended also. 
In order to test some of the measures suggested, several field ex- 
periments were carried on. In some of these the infestation was so 
light that no conclusions can be drawn from the results. Others, more 
conclusive, are reported below. The percentage of infestation given 
in each case is computed on the basis of 1,000 seeds taken at random 
from different parts of the experimental plot. 
Mr. Chris Schultz, Simpson, Minnesota, allowed us the use of his 
field for co-operative experiments in 1912. Two plots of 2 acres each 
were used, having a uniform stand. They were treated as follows: 
Plot I. 
Clipped back with the mower, May 31. 
Cut for seed, September 2. 
Infestation, 1/10 per cent. Yield per acre, about 1 bushel. 
Mr. Schultz reported that the seed in this plot was brighter and healthier in 
appearance than the seed trom Plot IT. 
Plot all: 
Cut for hay, June 25. Heads fresh in bloom and_ pink. 
Cut for seed, September 25. 
Infestation, 2 per cent. Yield per acre, about 1 bushel. 
Another plot was to have been used for late cutting of the hay but it was cut 
early by mistake. 
In 1912 also co-operative experiments were conducted on the 
field of Mr. Joseph Jackson, Verndale, Minnesota. Four 4-acre plots 
of uniform stand were treated as follows: 
Riotel: 
Cut for hay, June 14. Heads pink and green. 
Cut for seed, October 4. 
Infestation, 1/5 per cent. 
Plot IT. 
Cut for hay, June 22. Heads all pink. 
Cut for seed, October 4. 
Infestation, none. 
PloteLil: 
Cut for hay, June 26. About half of ‘heads turning brown. 
Cut for seed, October 5. 
Infestation, 5 per cent. 
PlotlV: 
Cut for hay, July 26. Heads all brown. 
Cut. for seed, October 5. 
Infestation, 831/83 per cent. 
