Orchid doctor

BUDS: On Cattleyas, Turn Yellow and Drop

Ailments Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 3 years ago.

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The air is possibly polluted with ethylene and automobile fumes, or burning wood, an unvented heater, insufficient light, injury caused by snails, slugs, insecticide or pesticides. A76-507; A76-698
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Buds Comments
BUD INITIATION: How to Induce? When sheath is on plant, give good light intensity, short days, cool nights below 60 to 62 deg. F.; for Cattleya mossiae provide below 56 deg.F. A70-1099 0
BUD REMOVAL: Will Size of Cymbidium Flowers Be Improved If Alternate Buds Are Removed? No appreciable change will occur; de-budded spikes are excluded from judging. A70-235 0
BUD ROT: In Paphiopedilums Caused by Erwinia cyprepedii which also commonly attacks base of leaves; watering procedures do not seem to be a factor; strong air movement 24 hours a day controls it partly; drenching plants with Physan 20 might help. A71-314 0
BUDS: Black Inside Cattleya Sheaths Rather common condition; to avoid it, when the buds appear clearly in shadow, cut off 1/2 inch from top of sheath; probably caused by sudden temperature change. A81-1436 0
BUDS: Blasting In addition to ethylene, it can be caused by drying out from either high or low temperature, or low humidity. A86-1140May be caused by air pollution, or too high or too low temperatures; in cattleyas it is frequently caused by moisture condensing inside the sheath where the temperature drops widely between day and night. OIE85Mar-4 0
BUDS: Brown, Spotted and Chewed Caused by possible infestation of snails; use Sevin or Zectran. A77-314 0
BUDS: Cattleyas Injury by two-spotted mites, illus. in A73-714 0
BUDS: Deterioration in Sheath It is not a disease; plant probably lacks food reserves if it has been grown under too much shade; save buds by removing sheaths before they turn brown. A71-535 0
BUDS: Fail to Open, Dry Up and Fall Off Gas heater should be checked for ethylene emission. A77-449 0
BUDS: Initiation Within Cattleya Sheaths In response to a signal, probably of chemical origin, the base of sheath develops rudimentary flower buds; the chemical signal is a hormone triggered by day length shorter than a critical length determined by the plant, and conditioned by a favorable temperature. A71-535 0
BUDS: In Sheath on Cattleyas Stopped Growing Could be cultural or genetic; no suggestions to offer; if buds are alive remove sheath. A75-1007 0
BUDS: Kept Closed by Sticky Secretions Excessive sugar is produced, sometimes following too much light, probably on a clear frosty morning, so a slight increase in the morning temperature should solve the problem; raise the thermostat a notch. OR81-110 0
BUDS: Not Opening Fully Phalaenopsis amabilis: suspected cause is abnormally low humidity; try syringing buds to dissolve nectar. A77-702 0
BUDS: On Cattleya Plants Shrivelled and soft, drop when touched; probably ethylene toxicity is the cause; check valves and controls on burner of dynavent heater using propane as fuel. A73-155 0
BUDS: On Paphiopedilums, They Turn Brown, Working Down the Stem Probably caused by bacteria; provide good air movement; water early in the day; for additional protection soak plants entire in Natriphene 1:2000 for 15 to 30 minutes. A72-534 0
BUDS: On Phalaenopsis They Blast and Drop Ethylene only is the cause, sometimes intensified by atmospheric conditions. A68-811 0
BUD STEMS: They Curl Before Emerging From Sheath Possible sticking of buds in sheaths is due to failure of the sheaths to open in a dry atmosphere. A73-208 0
BUDS: Turned Black on Cattleya Skinneri After Half-opening Probably caused by too much cold. A76-206 0

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