372 DISEASES OF ECONOMIC PLANTS 



bination of the seed plat with the Jensen hot-water treat- 

 ment. The directions for proceeding, drawn from Freeman 

 and Johnson, 1 are as follows : — 



A good, clean, well-cultivated piece of land should be 

 selected for raising seed. The plat should be large enough 

 to provide at least twice as much grain as will be necessary 

 for farm seed the following year in order to allow for loss 

 in cleaning and selecting. This seed plat should not lie 

 near fields of smutted crops of the same cereals, nor should 

 it be so located that the prevailing winds at flowering time 

 can carry spores to the seed plant from a neighboring field 

 of the same grain. This isolation is absolutely necessary. 

 A strip of wood, a cornfield, or a large meadow is a valuable 

 protection. 



After seed for the plat has been cleaned by the best fan- 

 ning and sifting, it must be treated by the Jensen method. 

 The clean seed should be soaked for from five to seven hours 

 in water at ordinary room temperature, 17° to 22° C. (63° 

 to 72° F.), then placed in small, loose sacks or wire baskets, 

 containing not more than one half peck each, and drained 

 for a short time. The seed must be treated in small lots 

 in order that all of the grain may quickly and uniformly 

 reach the desired temperature. " Two tubs or vats of 

 water should be provided. In one tub (No. 2) the exact 

 temperature required should be maintained. The other 

 tub (No. 1) is used for bringing the grain to the temperature 

 of the treatment, so as not to lower the temperature in tub 

 No. 2. Galvanized iron tubs of 20 to 40 gallons capacity, and 

 kerosene or gasoline double-burner stoves, are convenient. 



' Freeman, E. M., and Johnson, E. C, U.S. Dept. Agr. Bur. Plant Indus. 

 152, July 12, 1909. 



