Category: Orchid Doctor

BOTRYTIS: Cause and Cure

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago An ever-present fungus; causes small round brown spots on flowers; decaying organic matter under the bench is a good source; best control is to keep water off the flowers; give good air circulation... Read More

BOTRYTIS: Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A condition of high humidity over twelve hours causes the spores to sprout and causes death of cells; it sporulates off dying or dead organic matter; maintain night temperatures in mid- to upper-50... Read More

BOTRYTIS: Flower Spotting

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by Botrytis cinerea; occurs generally on cymbidiums, but also infects cattleyas and phalaenopsis; cool conditions favor infection (45 to 65 deg, F); clean culture is essential; to date no ch... Read More

BOTRYTIS: On Orchid Blossoms

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Fungus spores germinate during humid conditions, usually at night; there are six kinds that do this; a drop in humidity plus clear days will stop development; fans that produce gentle but definite ... Read More

BOTRYTIS: Petal Blight

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It can affect flowers in moist, cool and stagnant air; increase air movement and ventilation; spray with Benlate or Physan 20; illus. A66-558; A75-907 (illus); A77-436; cut off flowers. S204 Read More

BOTRYTIS: Time Lag to Its Visibility

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It takes normally 10 to 12 hours to show on cattleya flowers. A80-110 Read More

BOTTLE GROWING: Sophronitis Coccinea

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Inside a quart bottle place crocks on bottom covered with 9 pts. osmunda and 1 pt. sphagnum moss with plant in the mix; hang near top of greenhouse, shaded from sun's strongest rays, with open top;... Read More

BOTTOM HEAT: For Calanthes

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Plants must have strong bottom heat to stimulate vegetation. A76-710 Read More

BOTTOM HEAT: Under Seedlings

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Fine plastic tubes through which warm water circulates are arranged under the growing area and connected to the water heater; temperature is thermostatically controlled with a probe buried in the b... 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