Category: Ailments

BROWN SPOTS: Caused by Bacteria

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Phytomonas (Pseudomonas?) cattleyae; affects cattleyas and others, especially serious on phalaenopsis and young seedlings in community pots; soak plant in Anti-Damp or Natriphene. A73-815 Read More

BROWN SPOTS: On Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 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 over 7 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 over 7 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

PYTHIUM ULTIMUM: A Fungus

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Also know as slime mold; it favors moist, cold conditions; in one phase it swims on a thin film of moisture; can be spread by splashing water; causes soft brown rot. OD65-10; OD67-49; controls: Tru... Read More

COLOR BREAK, SEVERE: In Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Another disastrous disease caused by "severe color break disease"; color is patchy with ugly areas of pigmentation; it sometimes deforms flowers; plant is also affected -- new leads appear with ros... Read More

BUD ARREST: In Cattleya Sheaths

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 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

BLACK ROUND SPECKS (BALLS): On Leaves

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Likely spores of a common bark fungus Spaerobolus stellatus which may be shot two to three feet by the fungus; not harmful; drench mix with Physan; (may be fly excreta?) OD73-115 Read More

BUD DROP: Causes

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 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

PESTICIDES: Shelf Life

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They should be purchased for short-term use; mark the date of purchase on the container; most keep their effectiveness for two or more years if stpred properly; signs of ineffectiveness in dusts an... Read More