Abstract
SYNOPSIS Fifty-two families of Pinus taeda from the North Carolina State University's co-operative breeding programme were tested in Natal and compared to three open-pollinated South African seed orchard families. At fifteen years the best provenances are those from USA planting zone 4. Great variation exists among origins as well as families within this zone. The vigorous family from Marion County in Florida had poor stem form. The Livingstone Parish seed source from Louisiana did very well, both in vigour and form. The most northern and north-eastern sources had poor vigour. The results support earlier reports that seed from the most southern part of the natural range of the species should be imported and tested. Appreciable gains would be possible if families from the American co-operative breeding programme could be imported.
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