There is a well-known rigidity theorem of Y. Ilyashenko for (singular) holomorphic foliations in CP and also the extension given by Gómez-Mont and Ort́ız-Bobadilla (1989). Here we present a different generalization of the result of Ilyashenko: some cohomological and (generic) dynamical conditions on a foliation F on a fibred complex surface imply the d-rigidity of F , i.e. any topologically triv...

Abstract Invasive fungal pathogens are an increasing problem globally and can cause strong effects on forest ecosystems. In this study, we contrast vegetation surveys in eutrophic elm ( Ulmus glabra ) ash Fraxinus excelsior forests southern Sweden, conducted just prior to the arrival of Dutch disease (DED) 1989, then again 2021, several years after dieback (ADB) began. At sample plot scale, spe...