gatrelle at tils-ttr.org
Tue Apr 16 16:40:08 EDT 2002
My Milkweed/Monarch question is different. I have wondered if there is any
study that estimates the range and density of various Milkweeds before the
advent of Europeans on this continent. Here in the southeastern coastal
plain there is certainly much much more open country where Milkweeds can
take hold than 400 years ago. I would seem that Monarchs were once fairly
scarce or absent here. ?????? ????? One still does not see a great many
here in the Charleston area over the course of any given year.
There are other historical questions. Like how has the overwintering areas
in Mexico changed over the last 400 years? Is there volcanic activity in
that region? How has the human impact on California and Arizona impacted
monarchs and milkweeds? For a few..
----- Original Message -----
From: "Mark Deering" <entomology at butterflyhouse.org>
To: <monarch at saber.net>; "Leps-l" <Leps-l at lists.yale.edu>
Sent: Tuesday, April 16, 2002 4:15 PM
Subject: Re: Interesting ...
> Hi Paul,
> JUST A FEW COMMENTS TO YOUR POST
> > Hank, the frog / herbicide study was a lab study and may have no
> > relevance to field conditions.
> [[ Just because it is a lab study does not mean that it is NOT
> > But University of Nebraska weed scientists say just the opposite:
> > http://www.ianr.unl.edu/pubs/weeds/g384.htm
> > "There are several reasons common milkweed is on the
> > increase in Nebraska. Less tillage is used in crop production
> > today than in the past, creating more favorable conditions for
> > plant establishment and growth. HERBICIDES [e.g. Roundup]
> > ARE WIDELY USED TODAY WHICH OFTEN DO NOT
> > HARM COMMON MILKWEED BUT CONTROL MOST
> > ANNUAL WEEDS THAT WOULD
> > OTHERWISE COMPETE WITH >
> PAUL; THE WEED SCIENTISTS THAT YOU LINK TO ALSO SAY:
> "While preemergence herbicides have little effect on shoots coming from
> root system, some preemergence herbicides, including AAtrex, ATRAZINE,
> Sencor, and Lexone, will control common milkweed seedlings. "
> THEY ALSO SAY:
> ROUNDUP applied in a wiper applicator can be used to suppress common
> milkweed in soybeans. Herbicide coverage of the common milkweed is
> incomplete with this method, resulting in reduced effectiveness compared
> a sprayer. Used over several years, however, common milkweed populations
> be reduced with ROUNDUP applied in a wiper applicator. "
> SO PAUL, YOU CAN SEE THAT THESE SCIENTISTS DO INDEED FEEL THAT ROUNDUP
> ATRAZINE ARE EFFECTIVE FOR MILKWEED.
> Mark Deering
> Collections Manager and Curator of Butterflies
> The Sophia Sachs Butterfly House and Education Center.
> 15193 Olive Blvd.
> Chesterfield, MO 63017
> (636) 530-0076
> Fax (636) 530-1516
For subscription and related information about LEPS-L visit:
More information about the Leps-l