Category: Orchid Doctor

ROCKWOOL: Absorbs Fertilizers

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago During a dark winter the Electric Conductivity can double in the nutrient solution, so make it half normal strength; urea fertilizer applied to it hardly has a chance to be used before it is washed... Read More

ROCKWOOL: As Potting Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is inert, a spun rock, like fiberglass, it comes in three grades -- fine, medium, coarse -- and in both absorbent and non-absorbent types, including Grodan horticultural grade, available in 3 or... Read More

ROCKWOOL: With Perlite as Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A two year commercial experiment growing in a mix of water-repellent rockwool and perlite, with trial balances of nutrients and trace elements was termed a success; advt. A87-Jy-xiv Read More

ROCKY HABITATS: In Thailand

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A type of growing area that often supports a destinctive type of plant; a list of 29 showing their preferences for limestone or sandstone or granite; refer to W9-280 Read More

ROOF COVERING: For Growing Area

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago In Tampa, Florida, a plastic such as Lascolite, with 95% light transmission is too high for the area; consider an opal or white fiberglass; or use sufficient shading. A74-595 Read More

ROOT DISEASE: May Be Rhizoctonia or Fusarium Rot

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Benlate is an effective control if started in time, before the shrivelling of roots takes place and the yellowing and falling of the leaves. A75-1090 Read More

ROOT INITIATION: On Epiphytes

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A damp substrata will inhibit root growth; to develop roots use smaller pots, less media, larger pieces of the media and make certain drying of it occurs regularly. ODA72-6 Read More

ROOT ROT: Control in Cymbidiums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Dexon gives good control of rot caused by water molds; is moderately toxic to humans; Benlate and Physan may have good potential; Shell Drench 345 fungicide is commonly recommended. C72-83 Read More

ROOT ROT: In Seedling Flats and Pots

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use Shell Drench #345 added to the normal feed solution; it is toxic, so handle with care; is also expensive but a little goes a long way: 2.5 fluid ounces in a gal. of water is the STOCK solution;... Read More

ROOT ROT: Pellicularia Filamentosa

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A fungus, causes brown rot; can kill small seedlings rapidly; a brown mycelium infects the roots and other parts; soak in Natriphene at 1:2,000, or treat with Zineb or Tersan; repot clean. N317; us... Read More