Weed of the Week: Johnsongrass

Johnsongrass is a widespread perennial grass weed throughout the US, with herbicide resistant populations in the midwest, south, and mid-Atlantic. It spreads via rhizomes underground. Management: This information is based on Adam Davis and Bill Curran’s discussion of Johnsongrass management here. Managing perennial weeds that grow from both rhizomes and seeds, […]

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Tillage and residuals are powerful weapons against Palmer amaranth

Palmer amaranth requires a well-planned, integrated approach to management in order to keep it at bay and stop new plants from establishing. A recent multi-state study showed that tillage-based weed management programs are most powerful against Palmer when they combine a PRE residual herbicide program with deep tillage using a moldboard plow. […]

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Flowering pigweeds…in the spring?


Have you ever seen pigweed flowering in the spring? In Corpus Christi, Texas, Texas A&M weed scientists observed mature seeds on Palmer amaranth by mid-March this year. This was followed by the the first siting of flower heads on Palmer plants on April 6 in College Station. Published on April […]

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Weed of the Week: Canada Thistle

Canada thistle seedling, April 22 in Central Pennsylvania. Photo: Annie Klodd, Penn State University

Canada thistle is a common perennial weed in both conventional and organic cropping systems. It begins sprouting in mid-April to early May in the northern US, flowering mid-June to early July. It becomes difficult to control once it produces taproots and rhizomes, because 1) it spreads and reproduces via these […]

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Weed of the Week: Common ragweed

Common ragweed has already emerged in row crops and pastures around the country. Like most summer annual weeds, applying herbicide treatments now when they are still small will target them when they are most vulnerable and help ensure full control prior to planting. Herbicide resistant populations of common ragweed exist in many states, […]

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Weed of the Week: Barnyardgrass

arnyardgrass. Photo: Mississippi State University

Adapted from Barnyardgrass Management in the Mississippi Delta, Jason Bond, Mississippi State University Barnyardgrass is the most troublesome weed in Mississippi rice. Barnyardgrass that is allowed to survive and produce seed in soybean can cripple a rice weed control program the following year.  Fewer barnyardgrass escapes means less seed production, […]

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Weed of the Week: Horseweed (marestail)

Have you seen horseweed beginning to pop up with the recent spring weather? At this time of year, you could be seeing either spring-emerging horseweed or fall-germinated seedlings that are re-emerging for the spring. Now is the time to begin plans to till or use an herbicide burndown so that […]

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IWM tips for early-emerging kochia

Timely scouting and strategic crop rotation can help optimize kochia control as part of an integrated weed management program. Long stretches of warm temperatures in February have spurred kochia seedlings to start emerging in parts of the midwest including western Nebraska. Since control of kochia seedlings is best shortly after […]

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