Maturation-Related Resistance ofPinus radiatato Western Gall Rust

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Abstract
Pinus radiata (common name, radiata pine) propagated from juvenile (hedged) and more mature (nonhedged) donor plants of the same set of clones were compared to determine the effects of maturation on resistance to western gall rust, which is caused by the fungus, Endocronartium harknessii. The mroe mature plants had significantly fewer stem and branch galls than did the more juvenile ones during 2 yr following exposure to heavy natural inoculum. Clonal heritabilities were generally high and interactions between clones and maturation states were near zero. The use of selected clonal planting material and the manipulation of the maturation state of those clones may be useful in reducing the impact of western gall rust on P. radiata.

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