The subject of performed research was the assessment of healthfulness of plane trees (Platanus L.). Observations were carried out on the areas of historic parks in Rzeszow province in 2008–2009. The obtained results revealed a growing threat of anthracnose and as a consequence a growing intensity of the disease symptoms occurred on leaves. A higher intensity of anthracnose occurrence was recorded in the summer and autumn months, especially of on planes trees growing in the alleys of the Łańcut Park. The effect of biopreparations: Biosept 33 SL at concentrations of 0.05%, 0.1%, 0.2% and Biochikol 020 PC at 0.5%, 1% and 2% on the growth of mycelium of Apiognomonia veneta was assessed by the in vitro method. The preparation Bravo 500 SC at 0.2% was used as a standard. The studied preparations: Biosept 33 SL and Bravo 500 SC, showed a strong inhibiting effect on the growth of the pathogen mycelium, whereas Biochikol 020 PC at 2% had weak effect iveness. Biochikol 020 PC at 0.5% and 1%, added to the nutrient medium did not affect the mycelium growth.
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