. Fig. 220. — Rose mildew; diseased and healthy shoots. well cleared of superficial spores. Ammoniacal copper car- bonate used once each week is effective after the plants are in foliage. Lime-sulfur or Bordeaux mixture may be used when the residue on the foliage is not objectionable. Powdery-mildew {Sphcerotheca pannosa (Wallr.) Lev. or S. humili (DC.) Burr, Oidium). — This is perhaps the most wide-spread and destructive of all rose diseases both under glass and in the open, being especially destructive to the

---

Size: 2514px × 1989px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921