130 EXPERIMENT STATION. [Jan. 



in abundance before the plants were si)rayed. The results of 

 the observations of July 11 are o;iven below : — 



Plot 1 . Borxleaux and Paris Orecn mixed : — 



No live potato bugs found. 



The flea beetles scarce. 



The mixture colored the leaves well. 

 Plot 2. Bor'deaux and "■Disparene'" mixed: — 



No live potato bugs found. 



Flea beetles scarce. 



The mixture seemed to adhere rather better than the Paris green, and 

 covered the plants more evenly. 

 Plot 3. Bordeaux and Sodium, Benzoate : — 



A few potato bugs found on this plot. 



Flea beetles scarce. 



Color not A^ery strong. 



The mixture adhered well. 

 Plot 4. Soda Bordeaux and Paris Oreeji: — 



No potato bugs found. 



No flea beetles found. 



No strong color shown on plants. 

 Plot 5. Cop2)er Phosjjhaie and " Disparene " ; — 



No potato bugs found. 



Flea beetles very scarce. 



Mixture does not color j^lants to any appreciable extent. 



Although careful observations were made from day to day on 

 the general appearance of the field, and the presence and absence 

 of bugs noticed, by the time set for a second spraying no ma- 

 terial difference in appearance was noticeable. Without excep- 

 tion the plants maintained the same condition, i.e., they were 

 free from potato bugs and flea beetles. One plot, that on which 

 sodium l)cnzoate was used, did seem toward the last to have 

 rather more flea beetles and potato bugs than the others, 

 although these were not in sufficient numbers to do any but 

 local damage. There was absolutely no sign of biu-ning of 

 the leaves or stems on any of the plots. 



The field was sprayed as before for the second time on Jul}^ 

 22. The night after the spray was applied it rained heavily, 

 and most of the spray was apparently washed off; but when the 

 field was examined on July 29 no potato bugs were found, and 

 there was no sign of blight. There Avas no appreciable leaf 

 burning except in a few isolated cases, and in all these the 



