New York Agricultural Experiment Station. 395 



erty which 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 difference (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. R. Jones* of the Vermont Station 

 found strong Bordeaux decidedly preferable to weak Bordeaux, 

 but he did not use the same formulae 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 wag 

 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^ bushel* 

 per acre more than the same mixture without Paris green. Thi« 

 ihows that Bordeaux mixture falls far short of furnishing com- 

 plete protection against insects. Paris green must be used witk 

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

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

 Paris green applied dry, or the " Lion Brand " Bordeaux mixture 

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

 mies. Bordeaux mixture certainly 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 may not hare 

 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 6.25 bushels 



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



