The Orchid Doctor Articles under the Heading Air Pollution

Air Pollution Comments
AIR POLLUTION: Sulfur Dioxide, Ozone, Ethylene Cattleya buds and phalaenopsis buds just opening are extremely sensitive to ethylene cloudy, still weather in autumn and winter allows concentration; injury varies with degree and duration; high concentration causes older cattleya leaves to suffer; no control available; activated carbon filters are expensive. A65-697; A67-567; AH54 0

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