THE CHERRY LEAF-BEETLE. 93 
Hydrated lime, dusted on trees by hand, was used as a protective 
measure, and in some instances appeared to be effective. 
SUMMARY OF EXPERIMENTS. 
From the experiments and observations described, the following 
conclusions may be drawn: 
Arsenate of lead must be used at a rate of not less than 5 pounds 
to 50 gallons of water to be effective in protecting trees from injury 
by the cherry leaf-beetle. A mixture to which molasses was added 
at the rate of 14 gallons to 50 gallons of the mixture was effective in 
killing practically all of the beetles which fed upon the trees on which 
this mixture was applied. This addition of sweetening to the arse- 
nate has the serious disadvantage of making the spray easily washed 
off byrains. Arsenate of lead used without molasses was less effective 
in protecting the trees, although it killed some beetles and it was to an 
extent repellent to them. Lime in the amount in which it is added 
to an arsenate-of-lead spray was not repellent. 
Forty per cent nicotine sulphate applied with water at the rate of 
1 to 600, with or without soap, was effective as a contact spray. 
Weaker dilutions of nicotine sulphate and soap-carbolic acid solu- 
tions, although apparently effective at the time of application, did 
not have a permanent effect. 
CONTROL OF LARVA. 
If the larve fed on a cultivated plant, control measures might be 
directed against it, thus preventing the adults from developing in 
destructive numbers. But it feeds on a wild plant that is usually 
present where control measures can not be applied, often on land that 
is in no way controlled by the fruit grower, and not even in the imme- 
diate vicinity of fruitfarms. Nevertheless the clearing up of cut-over 
timberland and the destruction of the wild hosts of the larva of this 
beetle would greatly limit its possibilities of destructiveness. Should 
the cherry leaf-beetle become a permanent pest, cooperative work 
- along this line might be advisable. 
RECOMMENDATIONS. 
Spray practice for the control of the cherry leaf-beetle at the time 
of its next appearance in economic numbers can not be absolutely 
determined from the foregoing experiments. The numbers of the 
beetles, the duration of the migration, and the weather conditions 
at the time must qualify any recommendation. More extensive 
experiments also might modify the results. 
Nicotine sulphate, while temporarily effective, does not prevent 
a new invasion of an orchard on the day following its application. 
However, its use in peach orchards is recommended, for the greater 
