ROSE PESTS. 



239 



about three-quarters of an inch in length. It may often 

 be seen flying round and over rose blooms during summer, 

 or else engaged in tearing the petals in its effort to get at 

 the stamens and pollen. White and light-coloured roses 

 are greater favourites with it than dark ones. 



Kemedy. — Hand-picking of the beetles is the only 

 effectual remedy. The larvne do no damage, as they feed 

 only on decaying vegetable matter. 



IlOoE LEAVES: ONE HEALTHY AXD ONE INJURED BY FROG FLIE 



Sa.w-flies. — The larva? of these insects are exceed- 

 ingly destructive to rose trees. Some feed on the leaves, 

 others on the pith of the young shoots. The leaf -feeders 

 .are Eriocampa rosge, Blennocampa pusilla, and Emphy- 

 tus cinctus. The chief pith-feeding pest is Poecilosoma 

 candidatum. The Eriocampa larvae are slug-like in form, 

 humped in fi'ont, with yellowish-green bodies, and an 

 orange-coloured head. Those of the Blennocampa are 

 short, stumpy, with green bodies, pale brown heads, and 



