. Bulletin of the Department of Agriculture. Agriculture. 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 a striking color pattern of black and yellow were also abundant. These beetles were determined by Mr. E. A. Schwarz to be a large form of LeMa ornata Say. (Fig. 9.) In confinement these carabids would eat pupae and callow adults voraciously. In attacking an adult Galerucella the carabid would tear off one elytron and then eat the soft body tissu
. Bulletin of the Department of Agriculture. Agriculture. 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 a striking color pattern of black and yellow were also abundant. These beetles were determined by Mr. E. A. Schwarz to be a large form of LeMa ornata Say. (Fig. 9.) In confinement these carabids would eat pupae 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 pupse 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. There is no indication from entomological litera- ^^^l^'ot ture that any experiments to control this beetle the cherry leaf-bee tie. have been conducted previous to 1915. Pettit (10^e)nlarged- (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 b
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