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Leslie J. Mehrhoff Invasive Plant Atlas of New England

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Presentation on theme: "Leslie J. Mehrhoff Invasive Plant Atlas of New England"— Presentation transcript:

1 Distribution of Japanese Stilt-grass, Concerns, and Potential Impacts in New England
Leslie J. Mehrhoff Invasive Plant Atlas of New England University of Connecticut

2 The species…

3 A plant…

4 An incursion

5 Microstegium vimineum
Poaceae Annual grass Rich woods, alluvial forests, edges of fields, yards, roadsides, right-of-ways, almost anywhere! Native to Eastern Asia Earliest North American record – Tennessee 1919

6 Taxonomy – Microstegium vimineum (Trin.) A. Camus
Adropogoneae Tribe – Poaceae Synonyms: Eulalia viminea (Trin.) Ktze. Andropogon vimineum Trin. Eulalia viminea var. variabilis Ktze. Microstegium vimineum var. imberbe (Nees) Honda Common names: Japanese stilt-grass, Nepalese browntop

7 Current Distribution At least 23 states 2 New England states
Connecticut Massachusetts

8 Microstegium vimineum

9 History First record in US: Knoxville, TN - 1919
First records in Northeast: Pennsylvania New Jersey First record in New England Branford, CT

10 Northeastern U. S. First Records 1938

11 Northeastern U. S. First Records 1959 1938

12 Northeastern U. S. First Records 1984 1959 1938

13 Northeastern U. S. First Records 1987 1984 1959 1938

14 Northeastern U. S. First Records 1998 1987 1984 1959 1938

15 New England Records Connecticut Botanical Society Herbarium
Daniel Cady Eaton Herbarium (Yale) G. Safford Torrey Herbarium (UCONN) New England Botanical Club Herbarium Gray Herbarium (Harvard) Charles B. Graves Herbarium (Conn Coll.) University of Massachusetts Herbaria Invasive Plant Atlas of New England

16 First New England Record
Branford, New Haven County, Connecticut Date: 13 OCT 1984 Collector: Sterling Parker 84.15 Habitat: Damp, semi-open area

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19 Branford 1984

20 Branford Fairfield 1986

21 East Haddam Waterford Branford Fairlfield 1990

22 Windsor Willington East Haddam Waterford Branford Fairlfield 1991

23 Windsor Willington Kent East Haddam Waterford Branford Fairlfield 1993

24 1998 West Springfield Windsor Willington Kent East Haddam Waterford
Branford Fairlfield 1998

25 2000 West Springfield Longmeadow Pomfret Windsor Willington Kent
East Haddam Waterford Branford Fairlfield 2000

26 2003 West Springfield Millville Longmeadow Pomfret Windsor Willington
Kent East Haddam Waterford Branford Fairlfield 2003

27 Concerns More out there; being overlooked Correct identification
Early detection of new incursions How do we control it Need for long term monitoring

28 Some questions… How did it get here?
Are there particularly vulnerable habitats? Are there other incursions that we have not found? How far is it likely to spread? Will it be correctly identified and discovered in time?

29 Pathways & Vectors Recreational sites and hiking trails
Riverine and alluvial woodlands Roadsides and power line right-of-ways Botanist’s yards

30 Pathways & Vectors People – clothing, pets, equipment
especially hikers who have been in infested areas Trucks and equipment Natural biotic & abiotic dispersers – water, wildlife, birds Field equipment – packs, presses, vehicles (canoes)

31

32 Correct Identification
Annual Roots – fibrous Nodes – glabrous Sheath summit – hairy along margins Midrib – appears silver Glumes – present Fall color – yellowish to pale purple Flowering initiation – after mid September

33 Mistaken species Leersia virginica – White grass (native)
Brachyelytrum erectum (native) Brachyelytrum septentrionale (native)

34

35 Annual vs. Perennial

36 Inflorescences

37 Which grass is it?

38 These 2 species often grow together!
Leersia virginica AND Microstegium vimineum These 2 species often grow together!

39 Questionable Reports Appalachian Trail, Maine
Acadia National Park, Maine Northcentral Massachusetts Various yards around New England

40 What can we do? Learn to recognize Microstegium vimineum
Distribute herbarium specimens Train volunteers to recognize and report new incursions Predict potential range and habitats Control incursions

41 IPANE Invasive Plant Atlas of New England
300+ trained volunteers in 6 states Website images and information Identification workshops “Early Warning Species” Quick Report buttons Trigger rapid response Predictive modeling

42

43 IPANE Early Detection page
List of “Early Detection Species” Table of species’ status in all 6 states Early detection protocols How to report a possible new incursion

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49 Control efforts New England Wild Flower Society Volunteers
Town park employees Hand pulling efforts Connecticut DEP and TNC Land owner contacts Monitoring

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51 In Summary Microstegium vimineum is known to occur in Connecticut and Massachusetts Correct identification is possible but confusing Need for vigilance New incursions Not to accidentally move propagules Report new incursions

52 Contact us - http://invasives.eeb.uconn.edu/ipane/ ipane@uconn.edu
Les Mehrhoff

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