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Springtime sheep grazing helps control leafy spurge

Date:
December 31, 2009
Source:
USDA/Agricultural Research Service
Summary:
Using sheep to control leafy spurge works best if it's done in the spring every year, according to a new study.

Prescribed grazing with sheep is an inexpensive and effective way to control leafy spurge compared to applying herbicides and replanting pastures, according to new ARS research.
Credit: Photo by Scott Bauer

Using sheep to control leafy spurge works best if it's done in the spring every year, according to an Agricultural Research Service (ARS) study.

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After a few years of sheep grazing during spring, desirable forage grasses gain the upper hand as leafy spurge declines. Compared to applying herbicides and replanting pastures, prescribed grazing with sheep is inexpensive, according to researchers at the ARS Fort Keogh Livestock and Range Research Laboratory in Miles City, Mont., and cooperators.

Rangeland ecologist Matt Rinella at Fort Keogh, along with graduate student Ben Hileman from Montana State University, found that even a little grazing in the spring for a few years can trigger positive plant community changes in leafy spurge-infested areas. The researchers used clipping treatments that mimicked light sheep grazing. They did this so they could control all variables and isolate the effects of the seasonal timing of grazing.

A possible reason light spring grazing is so devastating to leafy spurge--and maybe to other non-grassy weeds--is that the defoliation stress triggers tannin production at the expense of plant growth. Tannins often repel grazers, so there is a selective advantage to this kind of response, but an extensive loss of foliage is too much of a detrimental offset. In the first year of being grazed, the spurge plants use carbohydrates stored in the roots, but these become depleted, and the carbohydrates devoted to tannins are not available for new growth.

Of course, the desirable grasses are eaten as well. But grasses, unlike broadleaf plants such as spurge, are less appetizing to sheep because grasses accumulate silica, and silica uptake and storage probably take less energy than tannin production.

This research was reported recently in the Journal of Applied Ecology.

In combination with sheep grazing and other non-chemical strategies, beneficial insects form the centerpiece of ARS' leafy spurge control program nationally.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Springtime sheep grazing helps control leafy spurge." ScienceDaily. ScienceDaily, 31 December 2009. <www.sciencedaily.com/releases/2009/10/091002100714.htm>.
USDA/Agricultural Research Service. (2009, December 31). Springtime sheep grazing helps control leafy spurge. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/2009/10/091002100714.htm
USDA/Agricultural Research Service. "Springtime sheep grazing helps control leafy spurge." ScienceDaily. www.sciencedaily.com/releases/2009/10/091002100714.htm (accessed January 29, 2015).

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