Shaun M. Sharpe
@shaun-m-sharpe.bsky.social
Research Scientist with Agriculture and Agri-Food Canada. Weed Scientist in the Canadian Prairies. Views, opinions, and comments are my own.
Pinned
Resistance makes #kochia hard to manage. We predict herbicide resistance development risk by modeling spray staging vs. future nonlethal dosing exposure to carfentrazone. Spray it below 5 cm with no branches. Open access through the link. #WestCdnAg #CdnAg 🧪 doi.org/10.1139/cjps...
Reposted by Shaun M. Sharpe
@shaun-m-sharpe.bsky.social said kochia has been detected in Saskatchewan as far north as Blaine Lake, about 80 kilometres north of Saskatoon, in the province’s northern grainbelt. www.theweathernetwork.com/en/news/life...
Prairie farmer concerned about food production as invasive weed spreads - The Weather Network
Scientists track spread, research ways to clamp down on kochia
www.theweathernetwork.com
October 13, 2025 at 6:45 PM
@shaun-m-sharpe.bsky.social said kochia has been detected in Saskatchewan as far north as Blaine Lake, about 80 kilometres north of Saskatoon, in the province’s northern grainbelt. www.theweathernetwork.com/en/news/life...
We are raising awareness of invasive pigweeds in the Prairies. Weed ID is important to tell if it's Palmer, waterhemp, or local pigweeds. We are growing out some different amaranth in the greenhouse for training and imaging purposes. Any guesses on this one? Is it #WeedyOrWanted?
June 6, 2025 at 4:08 PM
We are raising awareness of invasive pigweeds in the Prairies. Weed ID is important to tell if it's Palmer, waterhemp, or local pigweeds. We are growing out some different amaranth in the greenhouse for training and imaging purposes. Any guesses on this one? Is it #WeedyOrWanted?
We saw some weird purple spotting on lambsquarters growing out in the field edge during our walk today. Anyone recognize the spotting? Other weeds around but no others were spotted. We brought a few back to track if it spreads or they recover.
June 2, 2025 at 7:55 PM
We saw some weird purple spotting on lambsquarters growing out in the field edge during our walk today. Anyone recognize the spotting? Other weeds around but no others were spotted. We brought a few back to track if it spreads or they recover.
Common lambsquarters (Chenopodium album)
May 30, 2025 at 4:07 PM
Common lambsquarters (Chenopodium album)
Black medic (Medicago lupulina)
May 29, 2025 at 4:05 PM
Black medic (Medicago lupulina)
Reposted by Shaun M. Sharpe
OK for this weeks #WeedIDWednesday this is one that often gets sent to me with a panic that there's kochia being found... this is not kochia... so what is it? I have included a flower to help this week. -See? I can be nice sometimes!
May 28, 2025 at 4:49 PM
OK for this weeks #WeedIDWednesday this is one that often gets sent to me with a panic that there's kochia being found... this is not kochia... so what is it? I have included a flower to help this week. -See? I can be nice sometimes!
Pineappleweed (Matricaria discoidea)
May 27, 2025 at 4:06 PM
Pineappleweed (Matricaria discoidea)
Broadleaf plantain (Plantago major) grows among some prostrate knotweed (Polygonum aviculare).
May 26, 2025 at 4:06 PM
Broadleaf plantain (Plantago major) grows among some prostrate knotweed (Polygonum aviculare).
Reposted by Shaun M. Sharpe
🌼 poison ivy 🌿
Toxicodendron radicans
grows as a woody climbing vine, spreading groundcover, or as a low bush. the leaf shape is highly variable too!
#nativeplants #flowerreport
Toxicodendron radicans
grows as a woody climbing vine, spreading groundcover, or as a low bush. the leaf shape is highly variable too!
#nativeplants #flowerreport
May 21, 2025 at 1:10 AM
🌼 poison ivy 🌿
Toxicodendron radicans
grows as a woody climbing vine, spreading groundcover, or as a low bush. the leaf shape is highly variable too!
#nativeplants #flowerreport
Toxicodendron radicans
grows as a woody climbing vine, spreading groundcover, or as a low bush. the leaf shape is highly variable too!
#nativeplants #flowerreport
We just propagated some foxtail barley for a small study. We have kept these plants alive for a year so far in the greenhouse. We cut it back pretty heavily over the winter but it is alive...
May 16, 2025 at 2:05 PM
We just propagated some foxtail barley for a small study. We have kept these plants alive for a year so far in the greenhouse. We cut it back pretty heavily over the winter but it is alive...
Dandelion wasting no time this spring. Just waiting on a gust of wind.
May 15, 2025 at 4:07 PM
Dandelion wasting no time this spring. Just waiting on a gust of wind.
Revisiting black medic work from my PhD in FL. This link leads to an extension document I wrote during my postdoc for strawberry growers. More pics of various stages and GDD work for emergence and growth, and my work with clopyralid. edis.ifas.ufl.edu/publication/...
May 15, 2025 at 2:05 PM
Revisiting black medic work from my PhD in FL. This link leads to an extension document I wrote during my postdoc for strawberry growers. More pics of various stages and GDD work for emergence and growth, and my work with clopyralid. edis.ifas.ufl.edu/publication/...
Reposted by Shaun M. Sharpe
Well folks, we're back for another season of #WeedIDWednesday! This first weed for the week is one that has been popping up a bit in Central AB (Thanks @cropdocwatch for some of these pics). I think I get pictures of it every year and I start out stumped. Name that weed!
May 14, 2025 at 7:59 PM
Well folks, we're back for another season of #WeedIDWednesday! This first weed for the week is one that has been popping up a bit in Central AB (Thanks @cropdocwatch for some of these pics). I think I get pictures of it every year and I start out stumped. Name that weed!
Black medic is an invasive yellow clover. The middle trifoliate has an elongated petiole to help ID vs white clover.
May 14, 2025 at 2:06 PM
Black medic is an invasive yellow clover. The middle trifoliate has an elongated petiole to help ID vs white clover.
Resistance makes #kochia hard to manage. We predict herbicide resistance development risk by modeling spray staging vs. future nonlethal dosing exposure to carfentrazone. Spray it below 5 cm with no branches. Open access through the link. #WestCdnAg #CdnAg 🧪 doi.org/10.1139/cjps...
May 13, 2025 at 4:12 PM
Resistance makes #kochia hard to manage. We predict herbicide resistance development risk by modeling spray staging vs. future nonlethal dosing exposure to carfentrazone. Spray it below 5 cm with no branches. Open access through the link. #WestCdnAg #CdnAg 🧪 doi.org/10.1139/cjps...
Dandelion blooms.
May 13, 2025 at 2:07 PM
Dandelion blooms.
Weed surveys including pre-harvest and post-harvest seed collections for resistance screenings continue this year in #SK. We will target 1000 fields for abundance surveys. Soon you may be hearing from our teams if your fields were randomly selected. #WestCdnAg #CdnAg www.prairieweeds.com
May 12, 2025 at 6:40 PM
Weed surveys including pre-harvest and post-harvest seed collections for resistance screenings continue this year in #SK. We will target 1000 fields for abundance surveys. Soon you may be hearing from our teams if your fields were randomly selected. #WestCdnAg #CdnAg www.prairieweeds.com
A few shots of #kochia carpeting the ground in a disturbed area in Saskatoon. The remaining silvery biomass from last season makes it easier to spot from a distance. #WestCdnAg #CdnAg
May 10, 2025 at 7:26 PM
A few shots of #kochia carpeting the ground in a disturbed area in Saskatoon. The remaining silvery biomass from last season makes it easier to spot from a distance. #WestCdnAg #CdnAg
#Kochia emerged along a walkway in Saskatoon. An example of trichomes holding some rain drops above the leaves. Prostrate knotweed growing beside it. #WestCdnAg #CdnAg
May 10, 2025 at 1:28 PM
#Kochia emerged along a walkway in Saskatoon. An example of trichomes holding some rain drops above the leaves. Prostrate knotweed growing beside it. #WestCdnAg #CdnAg