Success with sumac eradication
Sumac eradication: http://pvcblog.blogspot.com/2012/10/sumac-eradication-techniques.html
Sumac biology and control: http://pleasantvalleyconservancy.org/sumac.html
A Search on Tom's Blog will lead to further posts on this topic.
The sumacs at Black Earth Rettenmund Prairie have been a special target of these efforts because it is a high-quality site that had lots of sumac, and its small size makes it convenient to canvas. Our work there began seriously in 2009, at which time there were several areas with large amounts of sumac. Detailed surveys using GPS were made in 2010 and 2011, as shown on the map.
|GIS map of the 2010 (red dots) and 2011 (yellow circles) sumac surveys. |
The red polygons show the presence of unusually large clones.
#8 is the Narrows and #7 is the Wide Narrows
(near where the photo below was taken).
By 2012 we were starting to get on top of the problem, and by 2014 eradication was almost complete.
Yesterday I made a survey of the Saddle and Wide Narrows areas, where large clones had been present. Happily, I found practically no sumac. The photo here shows a small single sumac stem that was buried within the prairie grass and forbs.
Because the intense sumac red has not developed completely in these small plants, a crew will be deployed for a mid-October follow-up survey. The members of that crew will be equipped with spray bottles of Garlon 4, and each sumac plant found will be basal barked.
|View across the Wide Narrows looking north (photo taken 9-25-2015). In 2010 there was a large sumac clone here. |
In June 2015 this area had a large population of wood lilies and in August there was blazing star.