| Abstrakt: |
An in vitro antifungal trials with conidiospores of Monilia fructigena were performed for testing the ability of seven organic acids to block their germination. Tested acids were: malic acid, succinic acid, tartaric acid, citric acid, acetic acid, formic acid and lactic acid. They are with low toxicity towards humans and the environment and most of them are typical food additives for achieving the sour taste of foods. Conidiospores of Monilia fructigena were taken from naturally infested apple fruits and an in vivo phytotoxic trials with two apple cultivars ("Golden Delicious" and "Jonagold" ) were performed too. Conducted tests show that tested acids express different effectiveness towards Monilia fructigena. Some of them as acetic, formic and succinic were completely inapplicable as potential fungicides towards testes pathogen. Conducted tests prove that they can inhibit the ability of conidiospores to germinate but in very high concentrations in which they also can cause damage on treated apple plants. However other acids as tataric, lactic and citric were effective in the very low concentrations (0.1-0.3 %) which make them very appropriate as fungicides. These acids are cheap, produced in large amounts (especially citric acid), safe for the humans and the environment and soluble in water. Up to 1 % concentration no one of the tested acid cause phytotoxicity on the apple trees. [ABSTRACT FROM AUTHOR] |
