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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We always treat the other non-native invasive
plants that might otherwise move in. Marc<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Bob Beyfuss
[mailto:rlb14@cornell.edu] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, July 17, 2007 11:45
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Marc Imlay<br>
<b><span style='font-weight:bold'>Cc:</span></b>
apwg@lists.plantconservation.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [APWG] FW:
Mile-A-Minute, Polygonum perfoliatum</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi All<br>
I am not familiar with the mile a minute vine eating weevil but here in NY a
colleague of mine at Cornell University, Bernd Blossy in conjunction with our
conservation department released purple loosestrife eating beetles as long as
16 years ago. I considered this bio control program a failure until this year.
I am not sure why, but this year the purple loosestrife is 99% gone from
literally thousands of acres of wetlands, roadsides and virtually everywhere it
had become established within my county. It may take many years for such
releases to work but this year the effect is almost astonishing. <br>
I also am pleased to read that some people realize that broad spectrum
herbicide applications to eradicate invasive plants may do far more harm than
good by creating biological vacuums which will soon be quickly colonized by
other invasive plants while inadvertently killing some of the plants one wants
to preserve in the first place. I think resource managers need to focus
more on what is the desired outcome of any actions they take before they take
them. Simply killing invasive plants for the sake of killing them
(gratification?) is not necessarily, in my opinion, a desired outcome unless
one can accurately predict what will replace them when they are gone. Assuming
desirable native plants will automatically become reestablished once the exotic
invaders are killed is a naive assumption. Think before you spray!<br>
Bob<br>
<br>
<br>
At 09:25 AM 7/17/2007, you wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Hough-Goldstein,
Judith [<a href="mailto:jhough@udel.edu" eudora=autourl> mailto:jhough@udel.edu</a>]
<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, July 16, 2007 9:10
AM<br>
<b><span style='font-weight:bold'>To:</span></b> ialm@erols.com<br>
<b><span style='font-weight:bold'>Cc:</span></b> ma-eppc@yahoogroups.com;
rreardon@fs.fed.us; elake@udel.edu<br>
<b><span style='font-weight:bold'>Subject:</span></b> Mle-a-minute biological
control<br>
</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Mark,<br>
</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>With
respect to your comment "Bio-control is having mixed success according to
reports", I just want to remind everyone that this is only the third year
the mile-a-minute weevils from China have been in the field, and in fact the
majority of the releases so far were done in 2006, with a few in 2005 and very
few in 2004. Most consisted of relatively few insects. It is normal for it to
take some time before anything definitive can be said about the effectiveness
of an agent - at least 3 years, and sometimes up to 10 years. The insects take
time to build up in numbers, and in some cases they also need time to adapt to
regional conditions. So far we know that the weevils can establish in a variety
of habitats, produce multiple generations during the season, and disperse
readily to new patches. As to impact on the plant populations, time will tell.<br>
</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Judy
Hough-Goldstein<br>
_______________________________<br>
Judy Hough-Goldstein, Professor<br>
Dept. Entomology & Wildlife Ecology<br>
<st1:Street w:st="on"><st1:address w:st="on">531 South College Ave.</st1:address></st1:Street><br>
<st1:PlaceType w:st="on">University</st1:PlaceType> of <st1:PlaceName w:st="on">Delaware</st1:PlaceName>,
<st1:place w:st="on"><st1:City w:st="on">Newark</st1:City> <st1:State w:st="on">DE</st1:State>
<st1:PostalCode w:st="on">19716-2160</st1:PostalCode></st1:place><br>
<a href="http://ag.udel.edu/enwc/research/biocontrol/index.htm">http://ag.udel.edu/enwc/research/biocontrol/index.htm</a><br>
<font color=navy><span style='color:navy'> <o:p></o:p></span></font></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Marc Imlay [<a
href="mailto:ialm@erols.com" eudora=autourl> mailto:ialm@erols.com</a>] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, June 26, 2007 9:34
PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">'Aliens-L@indaba.iucn.org'</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Mile-A-Minute, Polygonum
perfoliatum<br>
</span></font> <br>
<br>
<font size=4><span style='font-size:13.5pt'> <br>
</span></font><b><span style='font-weight:bold'>Three of us used garden rakes
followed by hand pulling in Little Paint <br>
Branch Park<font color=navy><span style='color:navy'>, </span></font>Beltsville
MD<font color=navy><span style='color:navy'> </span></font>on June 22, 2007 and
removed 20% of <br>
the massive 25 by<font color=navy><span style='color:navy'> </span></font>100
patch of Mile-Minute in an open area <br>
in 2 hours. For example, the three volunteers in 15 minutes used <br>
the rakes very gently to remove about 80% of the Mile-a-Minute <br>
in a 20 x 20 patch about 50% invasive vine cover over 50% native <br>
cover including sensitive fern, asters, sycamore and sweet gum <br>
seedlings and Virginia creeper. The herbaceous natives were not <br>
damaged and it was then easy enough to hand pull the remainder in <br>
30 minutes. When we tried to pull very<font color=navy><span style='color:navy'>
</span></font>hard at another spot<font color=navy><span style='color:navy'>,</span></font>
native <br>
plants, including a virgin creeper, were damaged. Hand pulling alone <br>
would have been seen as hopeless and herbicides would have <br>
damaged the natives. Bio-control is having mixed success according <br>
to reports. Cheers.<br>
<br>
Marc Imlay<br>
Laura Malick<br>
Mike Breen <br>
</span></b><b><font color=navy face=Arial><span style='font-family:Arial;
color:navy;font-weight:bold'> <br>
</span></font>Marc Imlay, PhD<br>
<br>
Conservation biologist, Anacostia Watershed Society<br>
(301-699-6204, 301-283-0808 301-442-5657 cell)<br>
Board member of the Mid-Atlantic Exotic <st1:place w:st="on">Pest</st1:place>
Plant Council,<br>
Hui o Laka at <st1:place w:st="on"><st1:City w:st="on">Kokee State Park</st1:City>,
<st1:State w:st="on">Hawaii</st1:State></st1:place><br>
Vice president of the <st1:State w:st="on"><st1:place w:st="on">Maryland</st1:place></st1:State>
Native Plant Society,<br>
Chair of the Biodiversity and Habitat Stewardship Committee<br>
for the <st1:State w:st="on"><st1:place w:st="on">Maryland</st1:place></st1:State>
Chapter of the Sierra Club<br>
</b><b><font color=navy face=Arial><span style='font-family:Arial;color:navy;
font-weight:bold'> <br>
</span></font></b><br>
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