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Janetiella potentillogemmae sp. nov. is described based on specimens reared from leaf bud galls of Potentilla recta L. (Rosaceae) found in western Turkey. Male, female, larva, pupa and gall are described and morphological characters are illustrated. Only one generation develops per year. Adults...
In the context of possible biological control of Eurasian watermilfoil (Myriophyllum spicatum L.), available information is summarized on the distribution of M. spicatum and closely related species, and the known insect and pathogen natural enemies recorded from Eurasia. Research gaps identified...
Several European Hieracium species, e.g. Hieracium caespitosum Dumort. and Hieracium aurantiacum L., are noxious weeds in North America. A project for the biological control of alien invasive hawkweeds has therefore been initiated in 2000. Five European insect species investigated before their...
During the summer of 2001, a newly recorded species of exotic hawkweed (Hieracium glomeratum Froel.) for North America was identified from specimens collected in southeastern British Columbia, Canada, and eastern Washington state, United States. The specimens had previously been identified as the...
The biology of the sympatric hoverflies Cheilosia urbana (Meigen) and Cheilosia psilophthalma (Becker) was studied at Delémont, Switzerland. Both species are associated with mouse-ear hawkweed, Hieracium pilosella L., in Central Europe and were chosen as potential biological control agents of alien ...
Four Eurasian Hieracium spp. (Asteraceae) are noxious weeds in New Zealand and targets for biological control. Cheilosia urbana and Cheilosia psilophthalma (Diptera, Syrphidae) are univoltine, sympatric hoverflies from Central Europe which have been screened to determine their safety as biological...