. Economic entomology for the . one part of emulsion in ten or twelve parts of water being ordi- narily sufficient. Whale-oil soap is quite as effective, and is preferable on some house or conservatory plants, while even the pyrethrum extract is useful on a small scale, and is, perhaps, the cleanest of all on house-plants.

---

Size: 2028px × 2464px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublishernp, bookyear1896