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Global Invasive Species Team listserve digest #064
Wed Jun 28 2000 - 18:34:46 PDT
--CONTENTS--
1. Hairy willow herb (Nationwide)
2. Black locust control (Wisconsin)
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1. Hairy willow herb (Nationwide)
From: Barry Rice (bamrice(at)ucdavis.edu)
In the last invasives digest (#63) Steve Richter wondered if he should be
concerned with a small population of Epilobium hirsutum (hairy willow
herb). I have specific and a general comments about this situation.
Specific: Epilobium hirsutum occurs in Washington state and a number of
northeastern states. It is used by gardeners as a replacement for purple
loosestrife (Lythrum salicaria). It reproduces by seed and vegetatively,
colonizes new areas, and forms monospecific stands. In 1999 it was listed
as a "Monitor Species" by the Washington State Noxious Weed Control Board.
A good summary of its ecology can be found at
http://www.wa.gov/ecology/wq/plants/weeds/willowherb.html
General: If you have a small population of a weed, especially one that
seems to be a new arrival, it is a good idea to act upon it. Budget a day
of weed eradication while the infestation is small. Even a population that
is only growing slowly is suspect, because many invasions have a lag time
near the beginning, before the population skyrockets. Strike early or
lament later! (Steve, I hope you don't think I'm picking on you!)
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2. Black locust control (Wisconsin)
From: Steve Richter (srichter(at)tnc.org)
Stewards from the Wisconsin Chapter will be doing lots of Black locust
(Robinia pseudoacacia) control this fall. Does anyone have any advice on
either using:
1. Applying a 25% solution of garlon 4 mixed with an oil for a basal bark
application, versus:
2. Applying a 20% active ingredient solution of glyphosate to the cut
stems.