Research Note

Screening of Pinus radiata Progenies for Resistance to Sphaeropsis sapinea

Published in: South African Forestry Journal
Volume 175, issue 1, 1996 , pages: 15–18
DOI: 10.1080/00382167.1996.9629887
Author(s): W.J. SwartDepartment of Plant Pathology,, D., G.M. DonaldFaculty of Forestry,, J.M. TheronFaculty of Forestry,

Abstract

The relative susceptibilities of half-sib progenies of Pinus radiata obtained from seed parents selected for apparent resistance to the pine pathogen Sphaeropsis sapinea in plantations in the Western Cape and Chile were assessed in two separate trials. In each trial, artificial inoculations with the pathogen were performed on the stems of 20 one-year-old potted seedlings. Cambial lesions which resulted on stems were measured 14 days after inoculation and the mean lesion length for each selection was evaluated as a trait indicative of the degree of field resistance of the respective parents. Substantial differences in mean lesion lengths were observed among the different progenies in both trials. There were significant differences (P<0,05) between minimum and maximum progeny means as well as among intermediate progeny means for each of the two trials. The results of this preliminary study suggest that indirect selection of P. radiata for resistance to S. sapinea from within a general breeding population has considerable potential which should be investigated more intensively.

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