222 
actually pulled out by tlie roots by these animals. Had it not been for this aggra- 
mating cause I have no doubt that the yield in straw and grain would have reached 
an average of 13 pounds per plat 
My conclusions regarding the efficacy of the various treatments are easily drawn, 
I have little hesitancy in saying that the several soil and seed treatments, so far as 
the prevention of rusts are concerned, were practically valueless. The sulphur treat¬ 
ments were productive of good results in an increase of yield but with that the matter 
stops. The success, whatever there is of it, has been all attained through sprayings. 
While it is true that no plat was entirely free from rust, it is nevertheless a fact that its 
ravages were reduced to a minimum on the ten-day plats sprayed with Bordeaux 
mixture and ammoniacal solution of copper carbonate. I think the potassium sul¬ 
phide solution should be discarded, as it seems to have a deleterious effect wherever 
applied. This was especially apparent, as will be noted, in Experiment B. Last 
fall I thought that the Bordeaux mixture when applied to very young plants had a 
deleterious effect, but my observations this season have led me to conclude that when 
properly applied no harm follows. 
Experiment B, 
Tlie object of this work was to test the effect of eleven preparations 
as preventives of rust when applied to spring wheat and oats in the 
form of spray beginning when rust first appeared. The preparations 
used were as follows :* 
Table 9 .—Showing the composition of the fungicides used . 
No. 26 
Basic cupric acetate mixture: 
Cupric acetate (refined powder). 
47. 6 grams. 
Water... 
15144. 0 grams. 
No. 27 
Copper borate mixture: 
Cupric sulphate. 
59. 6 grams. 
Sodium borate (borax). 
65.5 grams. 
Water. 
15144.(1 grams 
No. 28 
Cupric ferrocyanide mixture: 
Cupric sulphate.. 
59. 6 grams. 
Potassium ferrocyanide (yellow prussiate of potash). 
89.4 grams. 
W ater... 
15144.0 grams. 
No. 29 
Cupric hydroxide mixture: 
Cupric sulphate........ 
59. 6 grams. 
Potassium hydrate..... 
107.2 grams. 
Water. 
15144. 0 grams. 
No. 30 
Tricupric orthophosphate mixture: 
Cupric sulphate. 
59. 6 grams. 
Sodium phosphate. 
104. 2 grams. 
Water... 
15144. 0 grams. 
No. 31 
Cupric polysulphide mixture: 
Cupric sulphate. 
59. 6 grams. 
Potassium sulphide (liver of sulphur). 
59. 6 grams. 
Water.:. 
15144.0 grams. 
No. 32 
Ferrous ferrocyanide mixture: 
Ferrous sulphate exsiccatus. 
91. 7 grams. 
Potassium ferrocyanide. 
183. 5 grams. 
Water. 
15144. 0 grams. 
No. 33 
Iron borate mixture: 
Ferrous sulphate exsiccatus. 
91. 7 grams. 
Sodium borate (borax). 
367. 0 grams. 
Water. 
15144. 0 grams. 
No. 34 
Iron sulphide mixture: 
Ferrous sulphate exsiccatus. 
91. 7 grams. 
Potassium sulphide (liver of sulphur). 
367.0 grams. 
Water. 
If) 144. 0 orams. 
No. 35 
Zinc borate mixture: 
Zinc sulphate. : . 
133.4 grams. 
Sodium borate (borax). 
133. 4 grams. 
Water. 
15144.0 grams. 
No. 38 
Bordeaux mixture, weak strength: 
Cupric sulphate. 
10.4 grams. 
Lime (stone)... 
2. 5 irrams. 
Water.1....... 
15144.0 oraiins. 
The numbers here are the original ones given by my assistants to the prepa¬ 
rations for convenience nf .reference,. 
