Influence of several biotechnical products on growth limitation of fungi isolated from infested fruits of blueberry (Vaccinium corymbosum L) in vitro conditions

摘要

The influence of three biotechnical products Biochikol 20 PC (chitosan) at a dose 2; 4 and 6%, Bioczos BR (homogenate of garlic)- 1; 2 and 3%, Biosept 33 SL (extract from grapefruit) - 0.2; 0.4 and 0.6% and the reference fungicide Amistar 250 SC (azoxystrobin)- 0.05; 0.1 and 0.2% on mycelium growth of three species of fungi: Alternaria alternata, Botrytis cinerea and Cladosporium cladosporioides that are the most frequently isolated microorganisms from infested fruits of blueberry was examined in laboratory conditions. The study was conducted using a poisoned substrates method and Abbot's formula to evaluate activity of tested products. The research showed that the activity of examined compounds varies and depends on applied products, their concentrations and species of examined fungi. Biosept 33 SL demonstrated the best efficacy, higher than Amistar 250 SC, in inhibiting growth of fungal hyphae. Bioczos BR showed much lower efficiency, whereas Biochikol 020 PC did not show any activity in reducing mycelialgrowth. However, numerous reports reveal high efficacy of Bioczos BR in plant protection confirming that chitosan acts as an inducer of systemic resistance to some pathogens.