Category: Orchid Doctor

BLACK ROT: Leads Go Black, Leaves Change to Lighter Color and Wrinkle; Pseudobulbs Wrinkle and Show Brown Patches

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Truban is effective; cut off all diseased parts; plunge all into solution 1 tpg. A74-1062 Read More

BLACK ROT: Leaves on Cattleyas Develop Black Spot At Top, Eventually Killing Leaf and Sheath

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use Dexon-35 or Truban, 1 tpg. as an overall drench, or soak for 20 to 30 minutes; repeat in 14 days. A72-905; A79-1112 Read More

BLACK ROT: On Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Control with Truban or Dexon-35; Truban is gaining favor over Dexon-35; drench or soak in 1 tpg. A72-341; A75-680; A79-1112; use Tersan or Fermate. S198 Read More

BLACK ROT: On One-inch New Growths

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago This indicates a root disease; dip in Banrot solution ltpg., before repotting; another fungicide to try is Subdue, which may be effective. A81-393; RMH Read More

BLACK ROT: On Specimen Cattleya; Benlate Does Not Cure

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Black rot is not cured by Benlate, use Dexon-35, 1 tpg. soak for 20 minutes. A74-217 Read More

BLACK ROT: Phytophora Cactorum

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Leaf and heart rot; cattleyas are the main host; fungus attacks all parts except roots; shows purple, purplish brown or black; leaves often become brittle and can be jarred off; caused by coolness ... Read More

BLACK ROT: Pythium Sp. of Fungi

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago On cattleyas; cut rot away ruthlessly; burn the compost; immerse plant in Orthocide captan at 1 teaspoon to 1 pint water for one hour. OR76-99 Read More

BLACK ROT: Pythium Ultimum

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Most destructive of cattleyas, others are susceptible; similar symptoms to Phytophora cactorum; small water-soaked spots, later turn purplish black; yellow margin advances; spread quite rapid, 2 or... Read More

BLACK ROT: Tips of New Cattleyas Turn Brown

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by a fungus; remove all infected growth; soak pot and plant in 1/2 tpg. Dexon-35 or Benlate. A72-686; F69-94 Read More

ACID OR ALKALINE: Changing the Values

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidit... Read More