Category: Orchid Doctor

LEAVES: On Cattleyas Become Yellowed

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago If some have black splotches it may be caused by excessive soluble salts, or by toxic salts. A78-495 Read More

LEAVES: On Cattleyas Go Limp

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Too much nitrogen fertilizer, with too low light supply can cause it; poor root condition, such as too wet may be the fault. A72-686 Read More

LEAVES: On Cattleyas Go Limp and Wrinkled

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Possible injury to roots is the most likely cause; caused either by over-watering or excessive drying. A76-115 Read More

LEAVES: On Cattleyas Have Black Tips

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago On new growth it goes no farther than the pseudobulbs; spray with Truban or Terrazole, at 1 tpg. A79-4 Read More

LEAVES: On Cattleyas Show Shrivelling

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Suspect dryness of culture; cattleyas like high humidity, but too heavy watering can kill the roots. A75-1007 Read More

LEAVES: On Cattleyas Stay Folded

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Possibly caused by too low atmospheric humidity. A76-14 Read More

LEAVES: On Cattleyas Stay Long and Narrow

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago If they fail to spread open it is possibly because they lack sufficient light. A77-995 Read More

LEAVES: On Cattleyas, Have Purplish Spots

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Many pigments are masked until a cultural change takes place; higher light levels turn leaves purple; also, a nutrient deficiency can cause the color to appear; the areas around insect punctures tu... Read More

LEAVES: On Oncidiums Are Accordion-folded

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago In a window area this could be caused by too low humidity; the effect of misting lasts only 1/2 an hour. A75-1096 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