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Plasmodiophora brassicae is a pathogen that causes clubroot – one of the most serious and economically most important diseases of the Brassica family. Development of P. brassicae is influenced by factors such as temperature, humidity and soil pH. The effect of these factors may vary due to the adaptability of P. brassicae and unequal degree of resistance of plants to infection. The aim of the study was to determine the effect of temperature, humidity and soil pH on P. brassicae infection of plants susceptible to infection and plants with increased resistance. The experiment included three pH ranges of the substrate, 3 humidity variants and 4 temperature ranges. The study revealed that the development of P. brassicae was limited the most by the lowest temperature (13°C) and low humidity of the substrate, while high temperature and excess humidity showed the most stimulating effect on the pathogen. The optimum temperature for the development of the disease on sensitive varieties was 20–24°C, while on varieties with increased resistance 16–20°C.

Effect of temperature, humidity and soil pH on development of Plasmodiophora brassicae