The Orchid Doctor Articles under the Heading Brown Spots

Brown Spots Comments
BROWN SPOTS: Bacterial Disease Pseudomonas cattleyae; affects many genera; starts as soft water-soaked lesion becomes brown or black; advances rapidly; kills seedlings; occurs on leaves of older plants; spreads to growing point; exudates; highly infectious; on cattleyas it is limited to older leaves and is generally not fatal; spray with Physan at 1.25 tpg. monthly; use Natriphene three-quarters tpg. (1:2000) or Tersan 75. B39; BU48 0
BROWN SPOTS: Caused by Bacteria Phytomonas (Pseudomonas?) cattleyae; affects cattleyas and others, especially serious on phalaenopsis and young seedlings in community pots; soak plant in Anti-Damp or Natriphene. A73-815 0
BROWN SPOTS: Caused by the Bacteria Pseudomonas Cattleyae It affects phalaenopsis and others; control with Fermate, Benlate, then use Physan. Fi81-218 0
BROWN SPOTS: On Cattleyas May be caused by excessive spraying with chemicals. A75-618 0
BROWN SPOTS: On Phalaenopsis Bacterial rots are caused by cool, moist conditions; keep foliage dry and lower the humidity at night; follow scrupulous sanitary measures; the fungicide Subdue is effective but expensive at $75.00 a quart. A85-605 0
BROWN SPOTS: Pseudomonas Cattleyae The most common and the most severe disease of phalaenopsis; water-soaked lesions show first; it advances rapidly; it kills the plant when it reaches the crown; splashing water spreads it; spray with Physan 1/2 ttpg.; repeat. AH86-75 0

New Topics

  1. Mark Kaczynski asked question Looking for Dendrobium Jac-Hawaii 'Uniwai Pearl' in category General Discussion
  2. Angela Baxter started topic Catt. walkeriana in category Cattleya Alliance
  3. Luis Imatani asked question RLC/ LC Large flowered hybrids in category General Discussion
  4. Bill Overton asked question Phrag. Panther Run in category General Discussion
  5. William Gorski asked question Orchid Species: Vanda falcata h.v. Ryunotsume in category Species

New Comments

  1. Bill Overton commented on topic "Catt. walkeriana" by Angela Baxter
  2. Gonzalo Rotondaro commented on member plant Cattleya (Sophronitis) cerna by Laura Urban
  3. Steven Kirincich commented on member plant Lc. Little Oliver by Steven Kirincich
  4. Robert Rand commented on member plant Alcra. Winter Wonderland 'White Fairy' by Robert Rand
  5. Thuong Do commented on member plant Schom. tibicinis by Edward Zapata
  6. Bill Overton commented on topic "diseases" by Penny Edwards
  7. William Gorski commented on topic "Orchid Species: Vanda falcata h.v. Ryunotsume" by William Gorski
  8. Stefan Neher commented on topic "Stale Data" by Stefan Neher
  9. Susan Fairbairn commented on topic "diseases" by Penny Edwards
  10. Robert H. Findlay commented on topic "seed vs. pollen parent " by Robert H. Findlay