44 BULLETIN 30, U. S. DEPARTMENT OF AGRICULTURE. 
heads were counted in the center of each row, which was considered 
typical of the entire row. Then the number of bunted heads found 
among the 200 previously counted was noted and the percentage of 
bunt determined. The data obtained are given in Table XVII. 
TaBLeE XVII.—Percentages of bunt infection noted in a time-of-seeding test with two 
varieties of winter wheat at the Nephi substation in 1910 and 1912. 
[The seed had been inoculated with bunt spores. ] 
Date of planting. 
Variety. Aug. 15. Sept. 1. Sept. 15. Octal Oct. 15. Novy. 1. 
1910 | 1912 | 1910 | 1912 | 1910 | 1912 | 1910 | 1912 | 1910 | 1912 | 1910 | 1912 
| | ce 
RUTkeycn ee en ees eee es fecal) 50 0 42 | ae 20 39 35 19 35 2 
Odessa te ine eee Gas Og] eet ol ee ale On 25 | if a2 al wel. a 18 3 
Aoeriver tenn 0 | AG | 21-46 |e a5 5) 26 16 | 20} 25] 10] 26 2 
There is so much discrepancy in the results obtained that no rela- 
tion is indicated between the time of sowing winter wheat and bunt 
infection. The results of the first year strongly favored early plant- 
ing, while those of the second year favored late planting. The results, 
as a whole, seem only to emphasize the necessity of seed treatment 
for bunt infection. 
COPPER-SULPHATE AND FORMALIN TREATMENTS. 
Thoroughly inoculated seed of each variety was used in studying 
the effect of copper sulphate and formalin on bunt. An outline of 
the various treatments tested is given below: 
Copper-sulphate treatment: 
(a) 1 pound of copper sulphate to 5 gallons of water; seed soaked 10 minutes in 
this solution and then dried. 
(6) 1 pound of copper sulphate to 5 gallons of water; seed soaked 10 minutes in 
this solution and then soaked 10 minutes in a solution of lime and dried. 
(c) 1 pound of copper sulphate to 10 gallons of water; seed soaked 10 minutes and 
dried. 
(d) 1 pound of copper sulphate to 10 gallons of water; seed soaked 10 minutes and 
treated with lime as in b. 
(e) 3 pounds of copper sulphate to 10 gallons of water; seed soaked 10 minutes and 
dried. 
(f) 3 pounds of copper sulphate to 10 gallons of water; seed soaked 10 minutes and 
treated with lime as in 6. 
