One new genus and four new species of eriophyoid mites from Britain are described and illustrated: Novophytoptus aculeatus n. sp. (Phytoptidae) from Juncus squarrosus L. (Juncaceae); Tegnacus unicornutus n. gen. & n. sp. (Eriophyidae) from Carpinus betulus L. (Betulaceae); Calacarus pusillus n. sp. (Eriophyidae) from Calluna vulgaris (L.) Hull (Ericaceae); and Brevulacus extensus n. sp. (Diptilomiopidae) from Quercus robur L. (Fagaceae). Digital micrographs are also provided for each new taxon. Furthermore, 19 eriophyoid species are confirmed or recorded in Britain for the first time: one species in the family Phytoptidae, Trisetacus ehmanni Keifer from Pinus sylvestris L. (Pinaceae); 13 species belonging in the family Eriophyidae, Abacarus acutatus Sukhareva and Aceria eximia Sukhareva from Calamagrostis epigeios (L.) Roth (Poaceae), Acaricalus hydrophylli Keifer from Ilex aquifolium L. (Aquifoliaceae), Aceria exigua (Liro) from C. vulgaris, Acaricalus rubrifoliae Labanowski and Glyptacus fagineae Carmona from Q. robur, Aculus cytisi Labanowski from Cytisus scoparius (L.) (Fabaceae), Anthocoptes transitionalis Hodgkiss from Acer pseudoplatanus L. (Sapindaceae), Calepitrimerus buxi Petanović from Buxus sempervirens L. (Buxaceae), Calepitrimerus crataegi Malandraki, Petanović & Emmanouel from Crataegus monogyna Jacq. (Rosaceae), Neotegonotus fastigatus (Nalepa) from Acer campestre L. (Sapindaceae), Phyllocoptes abaenus Keifer from Prunus spinosa L., and Platyphytoptus sabinianae Keifer from Pinus nigra J.F. Arnold; five species belonging in the family Diptilomiopidae, Brevulacus reticulatus Manson from Q. robur and Quercus cerris L., Cheiracus ornatus (Farkas) from Fagus sylvatica L. (Fagaceae), Quadracus urticarius (Canestrini & Massalongo) from Urtica dioica L. (Urticaceae), Rhinophytoptus bagdasariani Shevtchenko & Pogosova from Ulmus procera Salisb. (Ulmaceae), and Rhyncaphytoptus amplus Keifer from Acer pseudoplatanus L. Two species are also recorded here in Britain as incursions, Tumescoptes trachycarpi Keifer on Trachycarpus fortunei (Hook.) H. Wendl. (Arecaceae) from a commercial plant nursery site, and Aceria gilloglii on Pleioblastus distichus (Mitford) Nakai [=Arundinaria pygmaea (Miq.) Asch. & Graebn. var. disticha (Mitford) C.S. Chao & Renvoize] (Poaceae) from a botanical garden.Collection details, distribution records and host symptoms are given for each species. The practice of publishing records solely identified from gall morphology and host association is also discussed.

Monitoring the establishment of plant pests enables national plant protection organizations to understand trends in biosecurity threats and thus modify their regulatory and management responses. A dataset of the 267 invertebrate pests establishing in Great Britain was compiled for the period 1970–2013. The number of establishments observed ranged between 1 and 13 per year. A study of time lags between the detection and reporting of new establishments showed that approximately 50% of new plant pests were reported after 2 years and 95% after 10 years. Therefore, the number of very recent establishments (and hence establishment rates) is underestimated. Correcting for the reporting lag, the annual rate of establishment was stable until the late 1980s, at approximately four species per year. Afterwards, the mean annual rate approached nine species per year. Approximately 50% of established species occurred only on hosts in the ornamental sector, approximately 25% in both wild and ornamental situations, and 25% only in the wild. Less than 5% of species pose a threat to economic sectors.

A new species of eriophyoid mite, Setoptus semiornatum n. sp., causing needle chlorosis to Pinus parviflora Siebold and Zucc. var. pentaphylla (Mayr) A. Henry (Pinaceae), imported into the UK from Japan, is described and illustrated. The morphological characters used to differentiate S. semiornatum and the other Setoptus Keifer species are provided and a remark on the classification within the genus Setoptus is made.

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