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Weed Science Society of America

Learn more about herbicide resistance research and weed management on the WSSA website.

How to use the Herbicide Classification chart

This printable guide explains how to use the Herbicide Classification chart.

Palmer Amaranth Poster

Poster about Palmer amaranth

Palmer Amaranth Fact Sheet

Fact Sheet about Palmer Amaranth

Waterhemp Fact Sheet

Fact sheet about Waterhemp

Common Lambsquarter Fact Sheet

Fact Sheet about Common Lambsquarter

Johnsongrass Fact Sheet

Fact Sheet about Johnsongrass

Italian Ryegrass Fact Sheet

Fact Sheet about Italian Ryegrass

Horseweed (Marestail) Fact Sheet

Fact sheet about Horseweed/ Marestail

Giant Ragweed Fact Sheet

Fact Sheet about Giant Ragweed