Category: Orchid Doctor

BROWN SPOTS: Caused by the Bacteria Pseudomonas Cattleyae

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It affects phalaenopsis and others; control with Fermate, Benlate, then use Physan. Fi81-218 Read More

BROWN SPOTS: On Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago May be caused by excessive spraying with chemicals. A75-618 Read More

BROWN SPOTS: On Phalaenopsis

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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... Read More

BROWN SPOTS: Pseudomonas Cattleyae

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 wi... Read More

BUD ARREST: In Cattleya Sheaths

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago No obvious reason except the death of the buds; remove sheaths carefully to see if buds are still green. A75-1007 Read More

BUD DROP: Causes

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Extreme temperature fluctuations, with excessive sunlight on the buds; a spell of smog which usually conveys ethylene; or a genetic aberrancy, not noted before. A85-1118 Read More

BUD DROP: Causes Other Than Ethylene

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Fertilizer imbalance might cause it, or trace elements deficiency; root damage has caused bud drop, as has Read More

BUD DROP: If Pollution Is Not Present

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago This is hard to explain, except the possibility the plant is self-pruning to sustain the rest of the buds. A73-906 Read More

BUD DROP: In Cymbidiums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago May be caused by several things: temperature dropping too low when buds are developing; shortage of water while forming or about to emerge; a weakened condition caused by lack of fertilizer, too mu... 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