April 2020 - Parks & Recreation - 29

cally taxing this work is for staff.
Manual weed control can be useful, though, when augmented by applying wood-chip mulch after removal, to prevent re-emergence. With the
benefit of large amounts of readily
available arborist-chip mulch, Seattle
has found this strategy effective.

Heat It Up
Heat-based weeding devices - using
either propane flame or hot water
and foam - warm plants until they
degrade and disintegrate. Seattle is
testing these devices in limited areas.
Flame weeding carries the risks of
fires, burns and smoke inhalation.
All staff using these devices must be
thoroughly trained to minimize risks.
We have used hot water and foam
devices with good results in city
landscapes for the past several years,
and believe they show great promise. These devices use a low-pressure
process that combines heated water
with biodegradable foam made from
plant material. When the heated
mixture is applied, the foam holds
heat on the target weed, allowing
cell degradation and desiccation
to occur. When the foam cools,
the area is safe for people and animals. This environmentally friendly,
herbicide-free alternative allows persons without pesticide licenses to do
the work that previously could be
done only by license holders.
Heat treatments have far broader
potential for applications, particularly in difficult-to-maintain landscapes, such as lidded reservoirs,
athletic fields, gravel walking trails,
pesticide-free parks, bioswales and
other stormwater infrastructure.
Since glyphosate had become a
major part of Seattle's weed control, the shift to using other methods has required work to adjust

successfully. But, this also creates
an opportunity for staff teams and
managers to get back to the basics
of IPM and refresh all staff thinking and practices around appropri-

ate, safe and healthy weed control
methods.
Patti Bakker is Interim Natural Resources
Unit Manager at Seattle Parks and
Recreation (patricia.bakker@seattle.gov).

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PA R K S A N D R E C R E AT I O N .O R G | A P R I L 2 02 0 |

Parks & Recreation

27

April 2020 - Parks & Recreation

Table of Contents for the Digital Edition of April 2020 - Parks & Recreation

April 2020 - Parks & Recreation - 1
April 2020 - Parks & Recreation - 2
April 2020 - Parks & Recreation - 3
April 2020 - Parks & Recreation - 4
April 2020 - Parks & Recreation - 5
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April 2020 - Parks & Recreation - 28
April 2020 - Parks & Recreation - 29
April 2020 - Parks & Recreation - 30
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April 2020 - Parks & Recreation - 37
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April 2020 - Parks & Recreation - 47
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2021
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2020
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2020
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2019
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2017
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2017
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2017
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2017
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2017
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2017
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2017
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2016
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/may-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/april-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/march-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2016
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/june-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/may-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/april-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/march-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2015
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/june-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/may-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/april-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/march-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2014
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2013
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2013
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2013
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2013
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2013
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2013
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/june-2013
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/june-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/may-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/april-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/march-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2012
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/june-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/may-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/april-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/march-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/february-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2011
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/december-2010
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/november-2010
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/october-2010
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/september-2010
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/august-2010
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/july-2010
https://www.nxtbook.com/nrpa/ParksRecreationMagazine/june-2010
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https://www.nxtbook.com/nrpa/ParksRecreationMagazine/january-2010
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