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. 



Table 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. 



Oct. 1. 



Oct. 15. 



Nov. 1. 





1910 



1912 



1910 



1912 



1910 



1912 



1910 



1912 



1910 



1912 



1910 



1912 



Turkey 





 



50 

 43 





 5 



42 

 49 



5 

 25 



33 

 19 



20 

 12 



39 

 2 



35 

 15 



19 

 1 



35 



18 



2 





3 













46 



2 



46 



15 



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 

 ths 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. 

 (J) 3 pounds of copper sulphate to 10 gallons of water; seed soaked 10 minutes and 

 treated with lime as in 6. 



