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<div>I agree with Bud, and I was going to say Hollies and laurels/rhododendrons/azaleas generally prefer to grow in acidic soils. You should also notice less stilt grass growing in pine forests and under large pines due to acidity of decomposing pine needles.</div>
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<div>I'd further venture to say the rate of decomposition of the strong holly and laurel leaves may be playing a role. The dense lignin/cellulose content of holly leaves means it takes at least two years for the leaves to break down. My thought is that these
trees may be self mulching and stilt grass may have a hard time establishing in areas of dense, long lasting leaf litter.</div>
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<div class="acompli_signature">Michael Ellis<br>
Non-Native Invasive Plant Specialist<br>
Natural and Historical Resources Division, Park Ranger Office<br>
The Maryland-National Capital Park and Planning Commission<br>
<a href="http://www.pgparks.com" x-apple-data-detectors="true" x-apple-data-detectors-type="link" x-apple-data-detectors-result="2">www.pgparks.com</a>
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From: Earl "Bud" Reaves Jr. <<a href="mailto:ipreav00@aacounty.org" x-apple-data-detectors="true" x-apple-data-detectors-type="link" x-apple-data-detectors-result="4">ipreav00@aacounty.org</a>><br>
Sent: Monday, September 28, 2015 9:30 AM<br>
Subject: Re: [MAIPC] FW: Stilt grass question<br>
To: tomnjan2 <<a href="mailto:tomnjan2@comcast.net" x-apple-data-detectors="true" x-apple-data-detectors-type="link" x-apple-data-detectors-result="6">tomnjan2@comcast.net</a>><br>
Cc: MA-IPC MA-IPC <<a href="mailto:maipc@lists.maipc.org" x-apple-data-detectors="true" x-apple-data-detectors-type="link" x-apple-data-detectors-result="7">maipc@lists.maipc.org</a>>, <<a href="mailto:INVASIVES@listserv.umd.edu" x-apple-data-detectors="true" x-apple-data-detectors-type="link" x-apple-data-detectors-result="8">INVASIVES@listserv.umd.edu</a>><br>
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I think it may be a soil condition, specifically a low pH from the accumulation of leaf debris. Stilt grass is known to prefer more basic soils.
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<div class="gmail_quote">On Mon, Sep 28, 2015 at 8:46 AM, tomnjan2 <span dir="ltr">
<<a href="mailto:tomnjan2@comcast.net">tomnjan2@comcast.net</a>></span> wrote: <br>
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<div>There were areas that little light was clearly at play, but a blanketed grass area with a lone Holly still didn't have grass below. Tree heights were mixed, and many were in significant sunlight as well. This variety of holly is more open than common garden
type. </div>
<div>Jan <br>
<br>
Sent from my iPad </div>
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On Sep 28, 2015, at 8:03 AM, "Hughes, Jake" < <a href="mailto:jake_hughes@nps.gov">
jake_hughes@nps.gov</a>> wrote: <br>
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<div dir="ltr">My guess is that light limitation is at work. Cole and Weltzin found the same pattern with paw paw (Asimina triloba):
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<p class="MsoNormal">Cole, P.G. and J.F. Weltzin. 2005. Light limitation creates patchy distribution of an invasive grass in eastern deciduous forests. Biological Invasions 7(3): 477-488.</p>
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<div class="gmail_quote">On Mon, Sep 28, 2015 at 6:27 AM, Marc Imlay <span dir="ltr">
<<a href="mailto:ialm@erols.com">ialm@erols.com</a>></span> wrote: <br>
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<p><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Any response for Tom and Jan?<u></u><u></u></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:blue">Marc Imlay, PhD,
</span></b><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:blue">Chair, Biological control working Group </span></b><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1f497d">
</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:blue">Conservation biologist, Park Ranger Office, Non-native Invasive Plant Control coordinator.</span></b><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:blue"><br>
</span></b><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:blue"><a></a><a href="tel:(301)%20442-5657" x-apple-data-detectors="true" x-apple-data-detectors-type="telephone" x-apple-data-detectors-result="16">(301) 442-5657</a> cell </span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1f497d"><a href="mailto:ialm@erols.com" title="blocked::mailto:ialm@erols.com"><span style="color:blue">ialm@erols.com</span></a><b><br>
</b></span><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:blue">Natural and Historical Resources Division<br>
The Maryland-National Capital Park and Planning Commission<br>
</span></b><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1f497d"><a href="http://www.pgparks.com/" title="blocked::http://www.pgparks.com/blocked::http://www.pgparks.com/blocked::http://www.pgparks.com/blocked::blocked::blocked::http://www.pgparks.com/blocked::blocked::http://www.pgparks.com/blocked::http://www.pgparks.com/blocked::http://www.pgpa"><span style="font-family:"Calibri",sans-serif;color:blue;text-decoration:none">www.pgparks.com</span></a></span></b><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:blue"> </span></b><b><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:blue"> </span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><u></u><u></u></span></p>
<p><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><u></u> <u></u></span></b></p>
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<p>-----Original Message-----<br>
From: tomnjan2 [mailto:<a href="mailto:tomnjan2@comcast.net">tomnjan2@comcast.net</a>]
<br>
Sent: Monday, September 28, 2015 12:16 AM<br>
To: Marc Imlay <<a href="mailto:ialm@erols.com">ialm@erols.com</a>><br>
Subject: Stilt grass question</p>
<p><u></u> <u></u></p>
<p>Hi Marc, <u></u><u></u></p>
<p>Tom (Crone) and I were walking around the back end of Greenbelt Park today. He was checking on some multiflora rose he'd cut earlier as well stilt grass he cut. But I noticed something I hadn't before. There were large swathes of stilt grass that had bare
patches within those areas. The common denominator was Holly tree leaf shed. We started searching elsewhere and found the same correlation. The stilt grass totally avoided wherever the dropped holly leaves landed. Have you seen this before, or know if there's
a specific chemical in the leaf that inhibits or kills the grass? Or some other symbiotic relationship creating the inhibition? I'm really curious to know. As we were driving out of the park, I started looking at the mountain laurel and what I saw didn't seem
to be surrounded by stilt grass either.<u></u><u></u></p>
<p><u></u> <u></u></p>
<p>thanks<u></u><u></u></p>
<p>Jan Steiner<u></u><u></u></p>
<p><u></u> <u></u></p>
<p>Sent from my iPad=<u></u><u></u></p>
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-- <br>
<div>Jake Hughes <br>
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