
A recent ER article brought to the attention the Park Division's pilot project to reduce starthistle in the park using the herbicide Milestone (MSDS: www.lanecounty.org/Roads/documents/MSDSMilestone.pdf).
Confused as to why the city would be supporting Dow Chemical by spraying one of their products along our trails, I inquired with the parks department, which responded by explaining that the application of Milestone was approved by the Bidwell Park and Playground Commission in December 2008 as part of a pilot project to reduce starthistle in areas where it could be spread easily by humans and animals, such as the trail heads and along trails.
While I was disappointed to find limited information about this project on the city website (however there is a flyer about helping with starthistle eradication through hand pulling), I was referred to Joseph DiTomaso's Yellow Starthistle Management Guide, which appears to be the bible on starthistle eradication.
The biggest pro's about using herbicides on starthistle are that it a) it appears to work better than other methods, and b) doesn't cost as much as other methods of control. And as far as herbicides are concerned, the EPA considers it relatively benign and has "designated (it) a reduced risk pesticide . . .because of its excellent toxicological and environmental profile."
But I don't buy it, for a number of reasons.
First of all, the goal of this pilot project is not to eliminate starthistle from Bidwell Park, but to control it along trails. This is fine, but one has to recognize that the starthistle will always grow back. And you will always have to apply more herbicide. How many applications of Milestone will it take before we start seeing adverse environmental impacts?
Secondly, according to Mr. DiTomaso, Milestone "is active on members of the sunflower family (Asteraceae), legume family (Fabaceae), carrot family (Apiaceae), nightshade family (Solanaceae), and a few other families." I can name a number of natives plants from these families that are indigenous to the park, and I would rather not see them disappear from the trails.
I would like to see more emphasis given to other control methods, for example: controlled browsing/grazing of sheep or goats, weed-whacking (preferrably with a scythe) in the early spring, hand pulling, or controlled burning.
While most agree that eliminating starthistle from Bidwell Park is an unattainable goal, I do see the value in trying to make a dent in it in strategic locations. But with this in mind, I don't think use of an herbicide is the way to go.
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