New York Agricultural Exteriment Station. 395 



ertj wliic'li caused it to hold the Paris green on the leaves. The 

 1-to-ll Bordeaux adheres just as well, but no better, than l-to-7 

 Bordeaux. The dili'erence (2.25 bushels per acre) is so slight as 

 to make them practically equal. Had late blight been prevalent 

 the results might have been different. In a season when pota- 

 toes blighted badly, Prof. L. K. Jones* of the Vermont Station 

 found strong Bordeaux decidedly preferable to weak Bordeaux, 

 but he did not use the same formuhT" used in this experiment. 



It was found wholly impracticable to get along with three ap- 

 plications of Bordeaux mixture. If any one of the first three 

 treatments had been postponed the plants would certainly have 

 been seriously injured by Colorado potato-beetles. And it would 

 not have been prudent to omit the fourth treatment which was 

 made July 24, because the plants would then have been unpro- 

 tected against late blight which was liable to appear any time 

 after July 15. 



With Paris green, l-to-7 Bordeaux mixture produced 19^ bushels 

 per acre more than the same mixture without Paris green. This 

 shows that Bordeaux mixture falls far short of furnishing com- 

 plete protection against insects. Paris green must be used with 

 it. It is to be noted, however, that Bordeaux mixture alone gave 

 better results than Paris green ,in lime water, Fungiroid and 

 I'aris green applied dry, or the " Lion Brand " Bordeaux mixture 

 and Paris green; and this, too, when insects were the chief ene- 

 mies. Bordeaux mixture certainh^ has considerable value as a 

 repellent of insects. 



The " Lion Brand " Bordeaux mixture with Paris green was a 

 failure, giving but 3^ bushels per acre more than Paris green in 

 water. The experiment does not prove that it ma^' not have 

 some value as a fungicide, because very little fungus was en- 

 countered in the experiment; but the experiment does prove that 

 as a spraying mixture for potatoes it is decidedly inferior to ordi- 

 nary Bordeaux mixture. It lacks the adhesive property of Bor- 

 deaux mixture. 



Fungiroid with Paris green made an even worse showing. The 

 rows treated with Fungiroid and Paris green yielded G.25 bushels 



*Vt. Agrl. Exp. Sta. Ninth Ann. Report, 1895, p. 97. 



