THE CHERRY LEAF-BEETLE. 19 
A PREDATORY ENEMY. 
In the leaf mold at the base of wild cherry trees, in which cherry leaf- 
beetles were transforming in great numbers, small carabid beetles with 
astriking color pattern of black and yellowwere also abundant. These 
beetles were determined by Mr. E. A. Schwarz to be a large form of 
Lebia ornata Say. (Fig. 9.) In confinement these carabids would 
eat pupe and callow adults voraciously. In attacking an adult 
Galerucella the carabid would tear off one elytron and then eat the 
soft body tissues. In confinement one Lebia killed four callow Gale- 
rucella adults in one night; only one was eaten, but the others all 
had the wings on one side torn off and were more or less mutilated 
otherwise. When pupez were killed nothing was 
left but the pupal skin. 
Several other carabids were found in places where 
the cherry leaf-beetle transforms, but none was 
found feeding upon it, nor could any of them be in- 
duced to do so in confinement. 
CONTROL. 
PREVIOUS RECOMMENDATIONS. 
£ ph 
There is no indication from entomological litera- ee ees 
ture that any experiments to control this beetle _ thecherryleat-beetle. 
have been conducted previous to 1915. Pettit eel see 
(1898), Chittenden (1899), and O’Kane (1914) have 
recommended the use of Paris green and other arsenicals, doubtless 
basing their recommendations on their knowledge of related insects. 
Pettit (1898) recommended also the use of soap solution and kerosene 
emulsion, if spraying must be done on the trees when fruit is ripening. 
EXPERIMENTS IN 1915. 
When the cherry leaf-beetle appeared in the vicinity of North 
East, experimental spraying against the grape-berry moth was in 
progress at this station. Consequently no experimental work to 
control the beetle was undertaken until four days later, when the 
work in hand was finished. The effectiveness of poisoned sprays in 
these experiments was lessened somewhat by the fact that the beetles 
were feeding less heavily at the time of the application than they 
had been immediately after their arrival in this region. 
All spraying experiments made against beetles of the spring migra- 
tion were in two small orchards belonging to the late J. L. Spofford 
and M. D. Phillips, except some small cage experiments which 
were conducted in the insectary yard. These two orchards adjoined 
_ each other and were alike in so many ways that they were treated as 
