[APWG] Fwd: [MPWG] Bipolaris in WV
ForestRuss at aol.com
ForestRuss at aol.com
Mon May 16 10:30:36 CDT 2011
____________________________________
From: ForestRuss at aol.com
To: MPWG at lists.plantconservation.org
Sent: 5/16/2011 11:01:47 A.M. Eastern Daylight Time
Subj: [MPWG] Bipolaris in WV
MPWG:
The Bipolaris fungus has again appeared in central WV.
The first Microstegium plants started to germinate in mid April and within
two weeks seedlings were starting to sport Bipolaris lesions. In many
locations the lower blades of the stiltgrass plants had already died and in a
few areas the plants appeared to die almost as soon as they germinated.
The photo below was taken in an area that is at the leading edge of a SG
invasion....hopefully the end of a SG invasion.
In some areas nearly every individual stiltgrass plant was showing signs
of infection by Bipolaris within two weeks of gernination.
By mid May the infection has spread throughout this population. In many
areas the stiltgrass is becoming non competitive as the foliage dies back
and the surrounding native vegetation overtakes and dominates the ground
cover.
The "persistent" thatch produced by stiltgrass that lives through its'
full life cycle appears to rot very quickly in the face of a Bipolaris
infection. There are some areas where Bipolaris has been active for several years
and neither thatch or healthy Mv seedlings are present.
For people wishing to see Bipolaris in action, we will be hosting a
program at Crummies Creek Demonstration Forest in cooperation with the West
Virginia University Extension, the Woodland Owners Association of WV and the
National Woodland Owners Association on Saturday June 25 and some of the
session will involve visits to areas where Bipolaris has been active for several
years as well as areas subjected to annual mechanical control for over ten
years.
Special permits to move Bipolaris infected plants to other parts of West
Virginia are available through the WV Department of Agriculture.
Intentional movement of diseased plants from WV is possible as long as a permit is
obtained from APHIS.
However, Bipolaris, which appears to be native to the central Appalachians
showed up in Maryland and Virginia last year and the wet spring of 2011
has not hampered the spread of the fungus so it should be expected in more
locations this summer.
Look for additional updates as the growing season progresses.
Sincerely,
Russ Richardson, Certified Forester
PO Box 207
Arnoldsburg, WV 25234
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