Abstract
Abstract Orchid root samples collected from 4 commercial growers around Hamilton and from the Pukekohe Horticultural Research Station (PHRS), were examined for the intensity of mycorrhizal infections, The orchid roots from commercial growers' glasshouses where orchids had been cultivated for 5-20 years harboured more mycorrhizal fungi than roots collected from PHRS where orchids had been cultivated for about 15 months, The highest infection level recorded in Cymbidium was 88% and in Cattleya was 30%, Comparison of Cymbidium hybrid plants at different ages suggested that mycorrhizal infection increased with the age of the plant. Aerial roots had very low infections, The present study suggests that, once established, naturally occurring orchid mycorrhizal fungi are fairly widespread, and rapidly spread from plant to plant within a glasshouse.
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