324 Agricultural Experiment Station, Ithaca, N. Y. 



appear to have been sprayed with the mixture June 16 and Jnly 17, 

 and the resuks obtained by him are deeidedly encouraging. His 

 work indicates that these early treatments are essential for obtain- 

 ing the most thorough protection, but as applications of Paris green 

 are generally made at this time for destroying potato beetles, very 

 little extra work is required for treating the vines with the Bordeaux 

 mixture also. 



The results of my work during 1895 do not show such marked 

 dilferences as those quoted abov^e. The foliage of all the plants 

 mentioned in the preceding pages was several times examined with 

 particular regard to the work of the Hea-beetle. The number of 

 holes in the leaves was not counted, but the independent estimates 

 of different observers practically agreed with those of the writer, 

 and they may be considered as representing fairly well the amount 

 of protection afforded by the Bordeaux mixture. Upon the uni- 

 versity farm it was estimated that the amount of injury upon the 

 sprayed foliage was from sixty to seventy per cent as much as upon 

 untreated vines. The section which was treated with the old 

 mixture showed less injury where the greatest amount of sediment 

 was applied, and more at the other end where the mixture was 

 much diluted. 



The potato foliage on the farm of Mr. McNair was also protected, 

 but to a less degree. His plants were treated the first time July 19. 

 The foliage already showed considerable injury from the insect, but 

 no blighting of the foliage was apparent. Five weeks later we 

 estimated the amount of ffea-beetle injury upon the section which 

 received the most concentrated mixture to be about eighty-five per 

 cent of that upon untreated vines. In the other sections the differ- 

 ence was still less marked. It would seem that in order to derive 

 the greatest benefit from the Bordeaux mixture in preventing the 

 attacks of flea-beetles, the applications must be made during June 

 and July, and a strong mixture should be used. 



