Noxious Weeds Profile -
Table of Contents
Leafy Spurge. A. Plant B.
Portion of inflorescence showing cyathia between pairs of bracts.
Ontario Weeds Act - noxious
Other provinces - noxious in AB, BC, MN, and
Canadian Federal Seeds Act - Class 1
U.S. Federal Noxious Weed - no
U.S. Noxious State Reg - 19 states (including
Mich, Minn, NY, Wis)
Pub 505 - no
NE Weeds - mildly toxic to cattle
Canadian Poison Plant - The plant is usually
not ingested by livestock, but if large amounts are incorporated
in hay, poisoning can occur. Sheep are more resistant to leafy
spurge, but collapse and death have occurred (Kingsbury 1964).
Some humans can develop dermatitis and irritation from the latex.
Cornell Poison Plant - referred to Canadian
Indiana Toxic Plants: TOXICITY RATING: Moderate.
Spurges are highly unpalatable, and are rarely consumed in quantities
sufficient to cause serious toxicity, but are very irritating
upon contact. ANIMALS AFFECTED: Any animal consuming spurge
or coming in contact with the sap may be affected. DANGEROUS
PARTS OF PLANT: All parts. CLASS OF SIGNS: Gastrointestinal
irritation, dermal and ocular irritation, poor doer, weakness.
Difficult to control with 2,4-D and intermediate
for dicamba. Not listed on 2,4-D, Banvel or Roundup labels.
Apply herbicide at early bud (flowers mid summer) or in early
fall. Repeated mowing at 21 day intervals can be an effective
control. Mow when first blossoms (May to July) appear to prevent
seed production. Mowing may stimulate development of new buds.
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