538 Report of the Entomologists of the 



many of the grafts having died, apparently from the ef- 

 fects of the injuries caused by the beetles. The poison was 

 used at the same strength as for the cotton-wood leaf beetle, 

 with the addition of lime, and applied in each case with a barrel 

 pump outfit. Plot 1 was sprayed June IGth, June 18th and June 

 25th. Plot 2 was sprayed June 18th and June 25th. In both 

 instances the poison had good effect. It was not possible to 

 tell what percentage of the beetles had been killed by the poison. 

 It did have a noticeable eff'ect, however, in keeping them away, 

 and undoubtedly saved the nursery stock from much more serious 

 injury than had been caused when the spraying began. 



The third experiment consisted in applying the green arsenite 

 to potato vines infested with the potato beetle. The vines were 

 badly infested and presented the ai)i)earance usual in such cases. 

 Two small plots were sprayed, on two different occasions about 

 a week apart, a knapsack sprayer being used in each instance. 

 The usual amount of lime was added for each application. On 

 plot 1 the poison was used at a strength of one pound to 150 

 gallons of water, on plot 2, one pound to 100 gallons of water. 

 The effect of these applications was fully as beneficial as where 

 Paris green had been applied under similar circumstances. 



Experiment No. 3. 



One small plot of potatoes was used in this experiment. The 

 green arsenite was applied on two different occasions, about a 

 week apart, and was used at a strength of one pound to 150 

 gallons of water. The lime was omitted. There was no notice- 

 able injury to the foliage. 



In addition to the above experiments, the green arsenite was 

 used to a limited extent on apple and pear trees infested with 

 fruit worms, and on apple trees infested with the pistol case- 

 bearer. 



