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Paul O. Johnson

SDSU Extension Weed Science Coordinator


Berg Agricultural Hall 229
Agronomy, Horticulture & Plant Science-Box 2207A
University Station
Brookings, SD 57007

Paul serves the citizens of South Dakota as the SDSU Extension Weed Science Coordinator based on the campus of South Dakota State University in Brookings. 

Also by Paul O. Johnson

Four common spring weeds: Shepherd’s Purse, Catchweed Bedstraw, Waterpod and Henbit.

Spring Annual Weeds

There are several weeds that pop up very early in the spring and start flowering before most other plants have shown any signs of growth. Learn about some common varieties to look out for.

Paul O. Johnson making notes about a field of corn

SDSU Extension to Tackle Weed, Pest and Drought Inquiries at State Fair

August 23, 2021

To address drought concerns, as well as weed and pest inquiries, South Dakota State University Extension will feature two booth locations at the 2021 South Dakota State Fair Sept. 2-6 in Huron.

ALT: Left: Green Plamer amaranth next to a green sunflower. Right: Green plant with green, spiny structure at leaf base.

Palmer Amaranth: Now Is the Time to Scout

South Dakota State University (SDSU) Extension encourages farmers, ranchers and other landowners to start scouting for Palmer amaranth, a weed that has been rapidly spreading north into the United States and is likely to be glyphosate-resistant.