The aim of the study was to determine whether selected microorganisms such as Pythium oligandrum Drechsler, Bacillus subtilis (Ehrenberg) Cohn and Cryptococcus albidosimilis Vishniac & Kurtzman are able to reduce the development of Phytophthora infestans (Mont.) de Bary on a model plant at various temperatures and to establish their survival abilities. The experiments were conducted undergreenhouse and laboratory conditions on potato plants (Lord variety), which were artificially inoculated with P. infestans and treated with water solutions of examined microorganisms. It was demonstrated that the selected microorganisms varied in the survival and antagonistic abilities against P. infestans below 10°C and the yeast C. albidosimilis species exhibited the best abilities under low temperatures. All microorganisms were able to survive for one week under greenhouse conditions, however the survival rate for 10 days was low.

Badania prowadzono w warunkach laboratoryjnych i szklarniowych, gdzie założono doświadczenie na ziemniaku odmiany Lord, który inokulowano mikroorganizmem Phytophthora infestans (Mont.) de Bary oraz traktowano wodnymi zawiesinami czynników biologicznych: Pythium oligandrum Drechsler, Bacillus subtilis (Ehrenberg) Cohn oraz Cryptococcus albidosimilis Vishniac & Kurtzman. Celem badań było określenie czy wybrane mikroorganizmy ograniczają rozwój patogena na roślinie modelowej oraz ustalenie czasu ich przeżywalności w różnych temperaturach. Wykazano, że wybrane mikroorganizmy charakteryzują się zróżnicowaną przeżywalnością i zdolnościami antagonistycznymi wobec P. infestans, preferując temperatury do 10°C. W warunkach szklarniowych wszystkie mikroorganizmy przeżywały do 7 dni, natomiast ich przeżywalność powyżej 10 dni była niewielka. Wysoką aktywnością biologiczną w temperaturze 4°C wykazał się C. albidosimilis, podczas gdy P. oligandrum i B. subtilis hamowały wzrost i rozwój.

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