I had a call this week on stinging nettle (fireweed) in bermuda/bahia pasture. It is a winter annual that is a nuisance because it has tiny hairs that embed in our skin when we touch it; and causes irritation for hours. Cattle tend to avoid it, but but it can be problematic for horses.
Pictured left to right are pictures that was sent to me of the stinging nettle in the pasture setting.
Here is a picture of what it looks like close up.
(Source: Wunderlin, R. P., and B. F. Hansen. 2008. Atlas of Florida Vascular Plants (https://florida.plantatlas.usf.edu/).[S. M. Landry and K. N. Campbell (application development), USF Water Institute.] Institute for Systematic Botany, University of South Florida, Tampa.)
Control
Three good options for stinging nettle are: Grazon P+D, Milestone, and PastureGard.
Grazon P+D: 2-4 pt rate, good choice in permanent pasture land and there are no grazing restrictions for non lactating animals. Withdraw meat animals from treated forage 3 days before slaughter. Always check the label for other details.
Milestone: 4-7 fl oz rate, good choice on permanent pasture land, no grazing restrictions, but a field bioassay must be done before planting other legumes or broadleaf crops to show that the concentration in the soil will not injure them. Always check the label for other details.
PastureGard: 1.5-8 pt rate, but 24 oz is a good choice. No grazing restrictions for non lactating animals, withdraw meat animals from treated forage 3 days before slaughter. Always check the label for details.