Category: Orchid Doctor

GROWTH: Poor Rate

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Many things can contribute to poor growth; check the root system for damage and correct it by esing a more open mix and/or by means of a larger pot; check the light, the potting mix, the water qual... Read More

GROWTHS, NEW: Cattleyas Infected with Pythium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Control it with a fan and sprayings with Truban after cutting out the infected parts, A80-960 Read More

GROWTHS, NEW: Diminished Size

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago In cattleyas this condition is a result of insufficient light. A86-1252 Read More

GROWTHS, NEW: On Cattleyas, Weaken and Fall Over When Half Mature

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The cause of soft, spindly growth is probably due to excessively high temperatures, or to poor roots. A71-21 Read More

GXBBERELLIC ACID: Effect on Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For commentary refer to A57-496+; A58-398+ and 537+ Read More

GXBBERELLIC ACID: Effect on Cymbidiums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Three bulb divisions were treated with Ethylene Glycol Ether Gibberellate 0.6% in a solvent 5.1 acetone; isopropanol system; spray was directed at spikes using atomizertype hand spray to point of r... Read More

GXBBERELLIC ACID: Effect on Dendrobiums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The acid at four different concentrations was used on 325 pseudobulbs; treatment with 7.5 ppm. soaked for ten minutes twice with one day interval produced the most sprouts. A62-986+ Read More

GYPSUM: As Top Dressing

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It can be beneficial for cymbidiums where the water supply has too much sodium; it adds calcium. OD76-122 Read More

GYPSUM: Supply of Calcium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is not highly alkaline, is available as a powder which should be useful in a tight potting mix but will wash out of a loose or open mix; pellets of it can be made by mixing Plaster of Paris with... 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