New York Agricultural Experiment Station. 343 



previous pages of this Report. In the former instance the in- 

 secticide was successfully used against a flea beetle, Systena 

 hudsonias Forst. attacking young apple grafts, and in the latter 

 with equal success against the cottonwood leaf beetle, Lina 

 scripta Fab. 



In the spring of 1896, and again in 1897, the writer used green 

 arsenite against the spring canker worm in an orchard near the 

 Station.. Fourteen large bearing apple trees were used in the 

 experiments. Both seasons the trees were sprayed three times, 

 the first being about the middle of May and the remaining two 

 from a week to ten days apart. In 1896 the remainder of the 

 infested orchard was sprayed with ordinary Paris green, and in 

 1897 the green arsenite alone was used. In 1896, the trees 

 sprayed with green arsenite were more uniformly free from 

 canker worms than those sprayed with Paris green, while in 1897, 

 the sprayed trees were practically free from canker worms after 

 the second application, which was made May 22, while the un- 

 sprayed trees were nearly stripped of their foliage. 



In addition to the above experiments the writer has used green 

 arsenite upon young pear trees against the fruit worm and upon 

 potatoes against the Colorado potato beetle. In both instances 

 the poison was used at the rate of 1 pound to 150 gallons of 

 water with the addition of enough freshly-slaked lime to make the 

 mixture slightly milky in appearance, and gave every indication 

 of being equally as efficient as Paris green. 



