Abstract
Chlamydospores of Phytophthora cinnamomi were used as inoculum of known density (ID) in an investigation of the rate of jarrah seed germination and the level of infection of seedlings at the various ID's.Inoculum recovery by soil plating was about 2% of the added density. The germination of the jarrah seedlings was accelerated by the increase of the ID, especially at ID of 250 chlamydospores g −1 soil. The nominal LD 50 value for jarrah seedlings per chlamydospore inoculum was calculated as 13.0 chlamydospores g −1 soil and the number of viable chlamydospores in the rhizosphere at the highest ID was estimated as 9.1.
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