Association of Phytophthora cinnamomi With Pinus radiata in South Australia

Abstract

In a pine forest plantation, P. cinnamomi was rarely isolated from the root zones, and never from the roots, of established P. radiata growing at P. cinnamomi sites. When a P. cinnamomi site was replanted with P. radiata, a third of the young pines died during the first 9 months, about 50% of them yielding P. cinnamomi from roots. Death of the trees followed an increase in the soil population density of P. cinnamomi which appeared to be correlated with increasing soil temp. and high soil moisture.