Category Archives: Weeds

Weed Identification Series, Galinsoga (Quickweed)

Mark Renz UW Madison Associate Professor and Extension Specialist, Chelsea Zegler UW Madison Associate Research Specialist Due to the warm weather last week we thought we would share one more weed ID plant for the season: Quickweed aka Galinsoga. We actually … Continue reading

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Weed Identification Series, Barnyardgrass

Mark Renz UW Madison Associate Professor and Extension Specialist, Chelsea Zegler UW Madison Associate Research Specialist Well the season is nearly over, but we wanted to point out a weed species that had a prolific year: Barnyardgrass. This species has long … Continue reading

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Weed Identification Series, Biennial Wormwood

Mark Renz UW Madison Associate Professor and Extension Specialist, Chelsea Zegler UW Madison Associate Research Specialist Biennial wormwood is not new to Wisconsin, as has been in the state over 100 years, but I have seen it spreading throughout Wisconsin for … Continue reading

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Video- Pigweed Identification Emphasizing Flowering Characteristics

Mark Renz UW Madison Associate Professor and Extension Specialist, Sam Marquardt UW Madison Assistant Outreach Specialist Pigweeds aren’t going away anytime soon. In fact, Palmer amaranth and waterhemp are moving into new areas of Wisconsin where they previously did not exist. … Continue reading

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Weed Identification Series, Waterhemp and Palmer Amaranth

Mark Renz UW Madison Associate Professor and Extension Specialist Concern about the continued spread of waterhemp and Palmer amaranth exist in Wisconsin. While invasion of these species has been much higher in adjacent states, populations are expanding in Wisconsin and … Continue reading

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Weed Identification Series, Wild Buckwheat

Mark Renz UW Madison Associate Professor and Extension Specialist, Chelsea Zegler UW Madison Associate Research Specialist Wild buckwheat is also known as black-bindweed or false buckwheat. While this species has been in Wisconsin for well over a century and documented in … Continue reading

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Weed Identification Series, 3 Biennial Thistles

Mark Renz UW Madison Associate Professor and Extension Specialist, Chelsea Zegler UW Madison Associate Research Specialist We wanted to emphasize Wisconsin’s common weedy biennial thistles in this weed identification series installment.  While Wisconsin has dozens of different thistles, we have three … Continue reading

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Row Spacing and Seeding Rate and Effects on Weed Management

Shawn P. Conley, Ph.D., Soybean & Wheat Extension Specialist Pigweeds are among the most abundant and troublesome weed species across the Midwest and Midsouth because of their prolific seed production capacity and their ability to rapidly evolve herbicide resistance. This … Continue reading

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Weed Identification, 2017 Series, Horseweed

WEED IDENTIFICATION SERIES PLANT #2 Horseweed Mark Renz UW Madison Associate Professor and Extension Specialist (mrenz@wisc.edu), Chelsea Zegler UW Madison Associate Research Specialist (zegler@wisc.edu) Weed species #2 that we wanted to emphasize this spring is horseweed, also known as marestail. This … Continue reading

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Weed Identification, 2017 Series, Common Chickweed

Mark Renz UW Madison Associate Professor and Extension Specialist (mrenz@wisc.edu), Chelsea Zegler UW Madison Associate Research Specialist (zegler@wisc.edu) Introducing a new Weed ID series of factsheets With everyone gearing up for the field season we thought it would be good to … Continue reading

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