Pathologic specialisation ofPlasmodiophora brassicaeWor. in New Zealand

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Abstract
Pathologic specialisation of Plasmodiophora brassicae Wor. in New Zealand was investigated in an experiment conducted in a glass-house, using six hosts, two sources of inoculum, and two dose rates. Source A infected Brassica napus L. ssp. rapifera (Metzg.) Sinsk. New Zealand Wilhelrnsburger swede and Brassica campestris L. ssp. rapiiera (Metzg.) Simko New Zealand Purple Resistant turnip, but not Brassica napus L. ssp. oleifera (Metzg.) Sinsk. Clubroot Resistant rape. Source B infected Clubroot Resistant rape but not Wilhelmsburger swede and Purple Resistant turnip. There were no differences between the two sources of inoculum on Brassica napus L. ssp. oleifera B.L.E. II rape and Brassica nigra (L.) Koch, which were both susceptible, and on Brassica napus L. ssp. rapifera Wye swede, which was predorninantly resistant. Infection score increased with an increase in dose rate in the susceptible host-source combinations, but not in the resistant ones. Infection score increased with an increase in dose rate in the susceptible host-source combinations, but not in the resistant ones.

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