UPDATE pest report June 2016 Identity confirmed: Hemitarsonemus ganeo (fern mite) instead of Hemitarsonemus tepidariorum (pest report March) Wider distribution on ferns outdoors (Polypodium vulgare, Dryopteris carthusiana, Dryopteris filix-mas, and Athyrium filix-femina). Single detection on plants for planting of Platycerium alcicorne (fern plants) in a production greenhouse.

Publication Date
Tue, 07 Feb 2017, 12:30
Last Updated
Feb. 7, 2017, 12:30 p.m.
Report Number
NLD-55/1
Country
Netherlands
Pest Id
Hemitarsonemus ganeo - (HEMTGA)
Report Status
Final
Hosts
Platycerium alcicorne, Polypodium vulgare, Dryopteris carthusiana, Dryopteris filixmas, and Athyrium filix-femina
Pest Status
  • Present: in all parts of the area
Summary

The identity of Hemitarsonemus ganeo could be confirmed on plants for planting of (fern plants) in a production greenhouse, which was detected in November 2015 (see pest report March 2016). Early September the mite has also been detected outdoors on ferns (Polypodium vulgare, Dryopteris carthusiana, Dryopteris filixmas, and Athyrium filix-femina) in public green and natural forests at great distance from the first finding (approximately 100 km). No apparent damage was observed on the outdoor ferns, as opposed to the indoor ferns of Platycerium alcicorne. It is presumed that the mite has been present for a prolonged period in the Netherlands. The mite may have escaped detection in the Netherlands due to the limited number of experts on Tarsonemidae. The identity was initially incorrectly determined as Hemitarsenomus tepidariorum. The fern mite H. ganeo has been earlier reported outdoors in Poland (Magowski, 2012), and is closely related to Hemitarsenomum tepidariorum which has been recorded in the USA, UK and Costa Rica before, but its pest status worldwide is highly uncertain. Both species can cause damage on various fern species. No official eradication measures are considered at present, in view of outdoor presence both in the Netherlands and in Poland. Follow-up measures consist of communication to stakeholders.

Report files
Identity confirmed: Hemitarsonemus ganeo (fern mite) instead of Hemitarsonemus tepidariorum (pest report March) Wider distribution on ferns outdoors (Polypodium vulgare, Dryopteris carthusiana, Dryopteris filix-mas, and Athyrium filix-femina). Single dete
Website
https://english.nvwa.nl/topics/pest-reporting/contents/pest-reports
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