|Author: ||G.J. Brits|
Candidate Leucospermum and Protea rootstocks for cut flower cultivation were generally evaluated for vigour, rootability, scion compatibility and long term field performance when grafted.
Special attention was given to adaptibility to soils with relatively high pH values and salt content. Leucospermum was also evaluated for tolerance to Phytophthora root rot.
No single species of Leucospermum could be identified as a satisfactory rootstock and the limited available tolerance to Phytophthora must be exploited further. Protea eximia, P. obtusifolia, P. mundii, P. lanceolata and lime-tolerant ecotypes of P. repens are potentially useful rootstocks for most commercial Protea species.
Interspecific hybridization in both Leucospermum and Protea holds promise to combine useful parental characteristics and utilize hybrid vigour.
Successful rootstocks must be developed and tested on a regional basis.
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