摘要
Combating the powdery mildew of apples requires permanent intervention with chemical substances. Such interventions are imposed by the development cycle of this pathogen, which during its entire vegetation produces its vegetative reproduction organs-conidia which in turn cause continuous infections. For this purpose, a whole range of fungicides is applied every year, which in order to provide more successful protection is supplemented by new chemical components. One of the most common fungicides which have been largely applied recently in protection of apple cultivars from this disease caused by the pathogen Podosphaera leucotricha is a fungicide produced under the trademark ZATO WG 50, mainly composed of trifloxystrobin. This fungicide also provided the best results in combating this disease during our three-year-long experiment, when compared to other types of fungicides. Taking into account the biology of this pathogen, this fungicide should be introduced until the end of vegetation, which may raise suspicion of its degradation into the apple fruits. In our study, apart from measuring the intensity scale of infection with this disease, we also conducted analyses of the time needed for trifloxystrobin to degrade into the apple fruits, by accurately determining the time of its decomposition by its application into two different concentrations.
