[MAIPC] [EXTERNAL] Clopyralid injury to woody plants

[Spencer, Sandy]

Hi Damien,
If it's Alligare brand of Clopyralid 3, that is highly mobile in permeable soils and does not bind well to soils, could travel far and deep.   If valuable trees with roots beyond drip line present in area to be treated, I'd go with something else.

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From: MAIPC <maipc-bounces at lists.maipc.org> on behalf of Ossi, Damien (DOEE) <damien.ossi at dc.gov>
Sent: Tuesday, July 6, 2021 11:37 AM
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Subject: [EXTERNAL] [MAIPC] Clopyralid injury to woody plants




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Does anyone have any experience using clopyralid in a situation where it’s sprayed on herbaceous plants under trees and in the root zone of those trees?  I have contractors managing a meadow area and they want to use clopyralid to control mugwort and clovers, but some of the application area would be under three very large willow oaks.  I am concerned that the soil residual activity or volatilization of the clopyralid might affect the oaks.



The label states “This product can affect susceptible broadleaf plants directly through foliar contact and indirectly by root uptake from treated soil. Therefore, do not apply CLOPYRALID 3 directly to, or allow spray drift to come in contact with vegetables, flowers, tomatoes, potatoes, beans, lentils, peas, alfalfa, sunflowers, soybeans, safflower, or other desirable broadleaf crops or ornamental plants.”  The label does not mention root uptake impacts to woody plants, and does list some oak species as being resistant to foliar applications.



Thanks,

Damien



Damien P. Ossi

Wildlife Biologist

Fisheries & Wildlife Division

Department of Energy & Environment

Government of the District of Columbia

1200 First Sreet NE, Fifth Floor

Washington, DC 20002

desk: (202) 741-0840

web: doee.dc.gov

damien.ossi at dc.gov<mailto:damien.ossi at dc.gov>



With Mayor Bowser adjusting the District of Columbia’s operating status in response to coronavirus (COVID-19), I will be teleworking indefinitely. I can still be reached at damien.ossi at dc.gov<mailto:damien.ossi at dc.gov> or 202-741-0840


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