Analysis of apple tree phytosanitary state showed that the species composition phytophage mites is labile and subject to a constant shift share ratio. In 2012-2013, orchards Crimea were dominated by Amphytetranychus viennensis Zacher. Its in acarocomplex was 80%. Since 2014, ratio has changed towards prevalence Panonychus ulmi Koch. - 50%. With this, A. decreased 25.0%. some years there mass re...

Dutch elm disease (DED) is a destructive tracheomycosis caused by Ophiostoma novo-ulmi , an ascomycete probably originating in East-Asia that devastating natural populations throughout Europe, North America and Asia. The fungus mainly spread bark beetles complete their life cycle between healthy diseased elms. Recently, it has been highlighted some fungi of the genus Geosmithia which are simila...

—Field inoculation trials are an important component of screening American elms (Ulmus americana) for levels of resistance to Dutch elm disease. A major concern in screening is variability in disease ratings from year to year. Previous studies have demonstrated that timing of inoculation can have a significant impact on disease susceptibility. In this study, trees were inoculated in the main st...

Abstract The new species Thyronectria ulmi is described from Ulmus laevis and U. minor collected in Austria, the Czech Republic Slovakia. It morphologically phylogenetically close to North American T. chrysogramma , which also occurs on shares olive green brown muriform ascospores, but differs latter by geographic distribution, narrower asci, smaller ascospores with fewer septa DNA sequence dat...