A taxonomic revision of the Xiphinema americanum species complex has necessitated a reexamination of the host range of species in the complex before recommendations can be made with confidence on the likelihood that specific crops will be damaged. Toward this end, populations of X. americanum and X. rivesi collected from apple orchards in eastern and western New York state were evaluated after ...

According to currently available data, 159 species of genus Taraxacum F. H. Wigg. were reported for North-West Russia (i. e. within the city Saint-Petersburg, Leningrad Region, Pskov and Novgorod Region), but among them specimens only 126 identified with reliability. Five are in this article as new Russia, a whole: T. acervatulum Rail., hepaticum macranthoides G. E. Haglund, sertatum Kirschner,...