. 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 {Sphceroiheca 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

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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921