INSECTICIDES, FUNGICIDES, AND WEED KILLERS. 



TABLE XXXIII. — Showing the S'lisitivetiess of Seed Oats to Blue Vitriol 

 Pickle (Gaillot). " 



TABLE XXXIV.— Showing the Delay in Germination by Blue Vitriol Pick- 

 ling of Seed Oats (Kuhn's method). 



TABLE Xyi^V .—Showing Effect of Kuhn's Blue Vitriol Pickling of Seed 

 Oats on the Oat Crop (Hollrung). 



Disinfection by Hollrung's method does not cause this diminution in 

 the crop so perceptible in Kuhn's method. 



Wheat. — Triticum sativum is invaded by Ustilago Tritici, Jensen 

 (smut of wheat) ; Tilletia caries, Tul. ; Tilletia levis, Kuhn (stinking 

 smut bunt of wheat). — It is particularly on this fun^jus that Prevost 

 tested the action of blue vitriol. By disinfecting " spotted " yraiu, that 

 is to say, covered with spores of Tilletia (bunt), he obtained : Spotted 

 non-treated grain, 486 per 1000 of i-usted ears ; spotted treated giain, 

 8 per 1000 of rusted ears, after steeping half an hour in a 1*2 per cent 

 solution. Whilst blue vitriol used alone greatly reduces the germinative 

 capacity of the barley, this treatment of Kuhn has not that drawback. 

 Grain treated with O'O per cent solution of blue vitriol, however, does not 

 show it if sown immediately (Grassrnann). 



