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Nick Roy: Poison Hemlock spreading in Adair County

New bane. Spread is rapid through countryside, especially along KY E 80 and KY 55 N in Adair County.
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By Nick Roy

In recent years, poison hemlock has become abundant near many roadsides and has started to become populated in some pastures and hayfields. The increasing population of poison hemlock seems to continue in 2015 as many non-farm clientele have made inquiries with the Extension Office in recent weeks concerning the plant. Poison Hemlock is ubiquitous along East HWY 80 and North HWY 55. Many farmers have commented that poison hemlock is the new thistle, comparing plants for sharing the ability to spread rapidly through the countryside.



According to Dr. J.D. Green, UK Weed Scientist, poison hemlock can be toxic if ingested by livestock. Cattle, goats and horses are considered to be the most susceptible animals but other animals can consume it. If ingested, poisoning symptoms appear within 30 minutes to two hours, depending on several factors including the animal species and quantity consumed. Lethal doses for cattle range between 0.2 and 0.5 percent of the animal's weight. Poisoning symptoms include nervousness, trembling, muscle weakness, loss of coordination, pupil dilation, coma and eventually death from respiratory failure. If ingested by a pregnant animal, it can cause fetal deformities.

The best time of the year to effectively control poison hemlock using herbicides is in the early spring when plants are smaller and in the rosette growth stage. In the rosette growth stage, plants can be more difficult to find since poison hemlock is growing close to the ground. However, the plant can still be easily recognized while walking pastures and hayfields due to its parsley-like leaves.

In late May and early June, Poison Hemlock matures producing flowers and eventually seeds. Plants should be mowed prior to seed production to prevent spreading. If found while cutting and baling hay, efforts should be taken to make sure plants are not baled and introduced into livestock's hay supply.

Realizing the significant spread of Poison Hemlock throughout Kentucky, in 2014 the Kentucky legislature revised the state's noxious weed law KRS 176.051 to include Poison Hemlock. In accordance, the Kentucky Transportation Cabinet will control Poison Hemlock on state-owned right of way at the request of the adjoining property owner. Landowners adjacent to state right of way and who are involved in control efforts on their property can submit a written application to the highway district office for assistance.


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This story was posted on 2015-06-10 08:06:45
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Poison Hemlock spreading in Adair Co.



2015-06-10 - Adair Co., KY - Photo by Nick Roy. According to Dr. J.D. Green, UK Weed Scientist, poison hemlock can be toxic if ingested by livestock. Cattle, goats and horses are considered to be the most susceptible animals but other animals can consume it.
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Is poison hemlock the new thistle?



2015-06-10 - Campbellsville Road, Columbia, KY - Photo by Nick Roy. This photo is on Campbellsville Road, north of Hobdy, Dye & Reed, across from Rex's Cycle Shop. Nick writes, "Poison Hemlock is ubiquitous along East HWY 80 and North HWY 55. Many farmers have commented that poison hemlock is the new thistle, comparing plants for sharing the ability to spread rapidly through the countryside."
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