Herbicide Damage Symptoms on Hemp

UC Weed Science

sitenum=157

Weed control, management, ecology, and minutia

Author: Sarah Light
Author: Brad Hanson

Published on: March 9, 2020

The introduction of a new crop into a landscape brings certain unknowns, including the risk of drift from neighboring crops. Hemp is a new, high-value commodity that is now being produced in many parts of California. The attached document includes photos and descriptions of herbicide damage symptoms on hemp. Plants were sprayed with herbicides that are widely used during the hemp growing season. Materials were selected that are likely to be sprayed on commodities planted near, or adjacent to, a hemp field. The intention is to provide a brief description of herbicide injury expected from specific herbicides or similar modes of action. The final page of the document is a table with the common registered uses of the materials included in this project.

Attached Files

herbicide damage hemp

Focus Area Tags: Agriculture

Tags: glyphosate (40), herbicide symptomology (6)

Comments: 2

Comments:

by Matthew Wheatley, PhD

on July 29, 2022 at 3:50 PM

I have a good deal of experience growing both commercial hemp and marijuana outdoors and have seen many examples of glyphosate contaminated soils damaging Cannabis, as this plant readily absorbs glyphosate through its roots. In my experience all members of this genus are quite sensitive to glyphosate and AMPA, the chemical glyphosate breaks down into and that has a much longer half-life than glyphosate itself.

by Abhishek

on February 1, 2023 at 10:44 PM

Interesting information on the potential impact of herbicides on hemp crops. It's crucial to understand the potential risks of introducing a new crop into a landscape, especially when it comes to drift from neighboring crops. This document provides a helpful description of herbicide damage symptoms on hemp and the herbicides likely to cause them. The table on the final page is especially useful, as it highlights the common uses of these materials. Thanks for sharing this valuable resource. [Edited by administrator]