SCREENING PROTEACEAE FOR RESISTANCE AGAINST PHYTOPHTHORA ROOT ROT - PRELIMINARY RESULTS

C.M. Bezuidenhout
The most important root disease of cut-flower Proteaceae is root rot caused by Phytophthora cinnamomi. This soilborne disease leads to loss of plants and can destroy entire plantations, if conditions are favourable. The long term goal of this project is to design a protocol for screening new Proteaceae material from breeding and selection programmes for resistance against Phytophthora root rot, before large scale commercialisation. The first objective of this project was to evaluate the pathogenicity of a selection of nine Phytophthora isolates on rooted cuttings of Leucospermum ‘High Gold’ in pots. All the isolates proved to be pathogenic under controlled conditions. The P. cinnamomi isolates all resulted in ≥75% mortality and the single P. cryptogea isolate resulted in 58% mortality within the six week trial period. The second objective was to evaluate different inoculation techniques to determine the most consistent and cost-effective technique. One technique entailed inoculating potted Leucospermum ‘High Gold’ plants with a slurry made from infected orchard soil and the other technique used a mycelial suspension to inoculate plants planted in vermiculite.
Bezuidenhout, C.M. (2014). SCREENING PROTEACEAE FOR RESISTANCE AGAINST PHYTOPHTHORA ROOT ROT - PRELIMINARY RESULTS . Acta Hortic. 1031, 85-89
DOI: 10.17660/ActaHortic.2014.1031.9
https://doi.org/10.17660/ActaHortic.2014.1031.9
Leucadendron, Leucospermum, Phytophthora cinnamomi, Protea
English