322 INSECTICIDES, FUNGICIDES, AND WEED KILLERS. 



Ustilago crameri (smut of millet). — Hecke examined the effect of 

 different disinfectants on the spores of this smut. Millet being very 

 sensitive to hot water, the latter cannot be recommended as treatment ; 

 disinfection by formol in O'l per cent solution is therefore of great im- 

 portance. 



TABLE LXX. — Showing the Effect of Sokitums of Formaline, Corrosive Sub- 

 limate, Oil of Vitriol, Blue Vitriol on the Germinative Capacity of Millet 

 Seed and the Spores of Ustilago crameri. 



To show the good effect of formol as a disinfectant, Hecke sub- 

 mitted a portion of seed millet to various treatments, and only collected 

 for sowing the very rusty seed which floated. In these conditions he 

 -obtained in the open field the following result : — 



•JTABLE LXXI. — Showing the Effect of Certain Disinfecting Fluids on the 

 Crop Produced from the Rusty Seed-Corn -which Fi-oats on the Fluid. 



Hecke after many trials, which need not be discussed, believed in 

 the efficiency of formol as a disinfectant for seed millet and in its 

 :superiority to the usual disinfectant if the grains are steeped for fifteen 

 minutes in 0'5 per cent solution of formaline, or for one hour in 0"25 

 per cent solution of formaline, or for three hours in 0-125 per cent solu- 

 tion of formaline. 



