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The Global Invasive Species Team | |
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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) --------------------------------------- 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!) --------------------------------------- 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. |
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