The evaluation of Pythium oligandrum and chitosan in control
of Phytophthora infestans (Mont.) de Bary on potato plants
Halina Kurzawińska, Stanisław Mazur
Department of Plant Protection
Faculty of Horticulture, University of Agriculture in Krakow
29 Listopada 54, 31-425 Kraków, Poland
e-mail: firstname.lastname@example.org, email@example.com
The studies were carried out both in in vitro and in vivo conditions. The field experiment was conducted
during the years 2005-2007 at the Experimental Station in Mydlniki, owned by the Department of Plant
Protection at the University of Agriculture in Krakow. The aim of these studies was to determine the
effect of tuber dressing and plant spraying with Polyversum (B.A.S. Pythium oligandrum) and
Biochikol 020 PC (B.A.S. chitosan) bio-preparations on the top leaves and tubers of ‘Ibis’
potatoes infested by Phytophthora infestans. The chemical preparation Vitavax 2000 FS (B.A.S.
karboxin and thiuram) was used. The in vitro evaluation of Polyversum and Biochikol 020 PC bio-preparations
on the P. infestans mycelium linear growth was investigated. The above-mentioned preparations were
applied at three different concentrations. The experiment was carried out using the Kowalik and
Krechniak method (1961). Based on the results it was found that the preparations under examination
significantly inhibited top leaf and tuber infestation by Phytophthora infestans. Moreover, according
to the results obtained from in vitro tests, a significant effect from the Vitavax 2000 FS and Polyversum
preparations and from the highest concentration (2%) of Biochikol 020 PC preparation on the percentage
inhibition of P. infestans mycelium linear growth was observed (in comparison to the control).
Kurzawińska H., Mazur S., 2009. The evaluation of Pythium oligandrum and chitosan in control
of Phytophthora infestans (Mont.) de Bary on potato plants. Folia Horticulturae 21/2: 13-23.