Interesting ...

Mark Deering entomology at butterflyhouse.org
Tue Apr 16 16:15:38 EDT 2002


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 happening. ]]

> 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 the
root system, some preemergence herbicides, including AAtrex, ATRAZINE,
Sencor, and Lexone, will control common milkweed seedlings. "
THEY ALSO SAY:
"Non-Cropland -- Established stands of common milkweed can be controlled
with herbicides. On non-cropland (i.e., roadsides, railroad rights-of-way,
etc., but not idle land or grazing land), Amitrol-T, ROUNDUP or Tordon would
provide control (Table II).
Cropland -- Common milkweed can be controlled in cropland with ROUNDUP prior
to planting sorghum, soybeans, and wheat. Treatments made from flower bud
through flowering growth stages (approximately the month of June) give the
best results. Leave common milkweed undisturbed by tillage in the spring
prior to treatment and for seven days after treatment. This requirement
delays planting spring-seeded crops until after the first week of June.
ROUNDUP can be used to control common milkweed in stubble after small grain
harvest, provided the milkweed is allowed to regrow undisturbed after
harvest. Banvel + 2,4-D (avoid use between June 20 and September 1 when
soybeans are nearby) can also be used in small grain stubble after harvest
under the same conditions, but is LESS EFFECTIVE THAN ROUNDUP and requires
retreatment the following year.

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 to
a sprayer. Used over several years, however, common milkweed populations can
be reduced with ROUNDUP applied in a wiper applicator. "

SO PAUL, YOU CAN SEE THAT THESE SCIENTISTS DO INDEED FEEL THAT ROUNDUP AND
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
www.butterflyhouse.org




 
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