97 
remainder of the upper surface yellowish orange. The under side 
of the body and wings is uniformly yellowish orange. The wing 
expanse varies from to ij4 inches. 
Fig. 12. Rose Leaf-roller, Archips rosa- 
ceana, adult. About twice natural size. 
natural ENEMIES 
A number of dipterous and hymenopterous parasites have been 
bred from the several stages of A. rosaccana which I collected in 
greenhouses in Chicago and Edwardsville in the summer of 1908. 
The minute omnivorous egg-parasite, Trichogramma prctiosa 
Riley*, was very common in the greenhouses at Edwardsville, the 
eggs when parasitized changing to a characteristic blackish color. 
From larvae, three hymenopterous parasites were bred, namely, 
Microgaster , sp.f, Chalcis ovata Say*, and Spilochalcis torvina 
Cressontt; and a single species of Tachina fly, Bxorista pyste 
Walk.t, were bred from pupae. 
remedies 
Arsenical Sprays. —The rose houses of Mr. J. E. Ammann, at 
Edwardsville, Ill., were found July 18, 1908, to be badly infested 
with leaf-rollers, and much damage was being done. In the houses 
containing the older plants it was found impossible to spray 
properly because of the mass of branches and the difficulty of 
thoroly wetting the foliage. In another house, containing small 
rose stock, the plants were sprayed with arsenate of lead. In a 
letter dated October 3, Mr. Ammann writes : “I can not find a 
leaf-roller on the place. In fact have had none for a month or 
more. The last spraying with arsenate of lead we did about 6 
or 8 weeks ago. Of course we continually hand-picked in addi¬ 
tion to the spraying, but I and my foreman both believe that the 
lead did the work. While it did not kill the rollers off at once, 
we believe that after all the leaves were covered with the lead 
the young could find.nothing to eat without a mixture of lead on 
it, and they got their medicine at once.” 
*Determined by A. A. Girault. 
fDetermined by C. T. Rrues. 
fDetermined by C. A. Hart. 
