[MAIPC] Summer Invasives.

[Patrick D. Kelly]

Perhaps high rainfall this year reduces the effectiveness of pre emergent herbicide in soils (excessive leaching). 2015 was also a high rainfall spring; 2016 was wet all summer and while having hot weather, we never really had the usual droughts. Agricultural crops are growing like weeds (and record harvest forecast), grass cutters are working overtime, nuisance and invasive vegetation is growing at jaw-dropping rates. 

Patrick Kelly, HorticulturistPDK Horticultural, LLCVegetation Control and Conservation ServicesCentreville, Maryland
 

    On Saturday, August 27, 2016 11:18 AM, Stephen Hiltner <stevehiltner at gmail.com> wrote:
 

 Sorry to hear. Perhaps development of a C4 pathway specific herbicide would help, since stiltgrass is said to be one of the few C4 species that grows in the shade? Googling brings up a few results--more than would come up a few years ago.
On Sat, Aug 27, 2016 at 10:53 AM, MarneyB <marneyb at earthlink.net> wrote:

On a walk recently on the River Trail at Great Falls MD I noticed that Golden ragwort – Packera aurea - was able to deter Japanese Stiltgrass in an area where this invasive and had taken to a large extent. Marney From: MAIPC [mailto:maipc-bounces at lists. maipc.org] On Behalf Of Marc Imlay
Sent: Saturday, August 27, 2016 9:39 AM
To: maipc at lists.maipc.org
Subject: [MAIPC] Summer Invasives. I have found this year that the Japanese Stiltgrass is no longer controllable over 400 acres of parkland  in spites of extensive use of pre-emergents in March. At the 200 acre Swann Park beefsteak is no longer controllable. And many folks have found the same for Wavyleaf basketgrass. . Twenty years ago it was very doable to save all our parks. So mid-late Summer invasives is very sad, especially since stiltgrass is so totally destructive and replaces the other ground vegetation.   I remind myself that I have been successful with invasives for the rest of the year including garlic mustard and Lesser Celandine. For the late Summer invasives , biological control remains our best hope, both effective host specific from Eurasia, etc. as well as waiting for native biological controls to pop up as with Ailanthus after 200 years. .  From: Imlay, Marc 
Sent: Thursday, August 25, 2016 10:08 AM
To: 
Subject: RE: Mniutes from August 2016 board meeting A top issue for invasive plant control folks is should we continue to remove all the Asiatic bittersweet, bush honeysuckle,  juvenile garlic mustard, Japanese barberry, porcelain berry, beefsteak, multi flora rose,  mimosa, wineberry,  and mile-a minute. Or switch our resources to Japanese Stilt grass and wavyleaf basket grass that have become so much more abundant and destructive at our high priority sites.   Marc Imlay, PhD, Chair, MAIPC Biological control working Group Conservation biologist, Park Ranger Office, Non-native Invasive Plant Control coordinator. Marc.Imlay@ pgparks.com(301) 442-5657 cell  Natural and Historical Resources DivisionThe  Maryland-National   Capital   Park  and Planning Commission Marc Imlay, PhD 
Chair of the Biodiversity and Habitat Stewardship Committee for the Maryland Chapter of the Sierra Club.  
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