Planting trials with Red Cedar.
Describes and maps the natural occurrence of Toona ciliata var. australis in New South Wales and reports the results of planting trials, with a view to re-establishing it. Container-grown 1 + 1 transplants were planted out in small groups throughout the forested catchments of the Warragamba and Metropolitan water-supply reservoirs in 1964 and 1965. Factors affecting establishment, and growth rates, are discussed. Infestations of Hypsipyla robusta were observed in natural stands and on two planted trees 5 years after their establishment in the forest. Establishment was very poor in open areas where the plants were exposed to frost and to sun and wind during drought periods, but was good under all forest canopies. Growth rates were rapid on deep, well drained soils under forest of high site quality that provided 30-80% canopy cover, and on sites beneath steep slopes or cliffs with a S. aspect. Of the stock planted 48% became well established, but >90% of seedlings surviving the first five years lost their leaders or the above-ground portion of the plant at some stage, giving rise to many crooked stems or multiple leaders. KEYWORDS: Hypsipyla robusta \ Planting stock \ Toona ciliata var. australis