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Background

Industrial hemp has emerged as an important multi-purpose end-use crop with a strong and growing market demand in Alberta. The lack of effective strategies for proper management of weeds is one of the major challenges to hemp producers in Alberta. There is a lack of registered herbicides for the control of grassy and broadleaf weeds which makes weed management especially challenging in hemp.

Project Details
Timeline 2022-2023
Principal Investigator: Mike Gretzinger
Farming Smarter
Lethbridge Project Contact: Mike Gretzinger
Funded By:

RDAR

Project Objectives

Screen pre- and post-emergent herbicides to evaluate hemp tolerance to these herbicides and support herbicide registrations for hemp.

  • Determine pre- and post-emergent herbicide tolerance of hemp by determining herbicide influence on plant injury, stunting, discoloration, etc.
  • Identify effective pre- and post-emergent herbicide to be further evaluated for registration in hemp.
  • Determine the efficacy of several herbicides applied at pre-emergent and in-crop stages to control broadleaf and grassy weeds in hemp including volunteer canola, wild buckwheat, and wild oats.

Methods

Varieties tested - Katani & Silesia

Treatments for broadleaf weed control

Pardner (a.i. bromoxynil, group 6) – in-crop at the recommended rate (400 ml/acre) 

Pardner – in-crop at the half the recommended rate (200 ml/acre) 

Pardner – in-crop at double the recommended rate (800 ml/acre) 

Odyssey (a.i. imazamox 35% and imazethapyr 35%, group 2) – in-crop at the recommended rate (17.3 g/acre)

Odyssey (a.i. imazamox 35% and imazethapyr 35%, group 2) – in crop at the recommended rate (17.3 g/acre) tank-mixed with Poast Ultra (a.i. sethoxydim, group 1) at recommended rate (190 ml/acre) 

Odyssey – in-crop at the half the recommended rate (8.7 g/acre) 

Odyssey – in-crop at the double the recommended rate (34.6 g/acre) 

Pursuit (a.i. imazethapyr, group 2) – in-crop at the recommended rate (85 ml/acre) 

Pursuit – in-crop at the half the recommended rate 

Pursuit – in-crop at the double the recommended rate (170 ml/acre) 

Authority 480 (a.i. sulfentrazone, group 14) – pre-seed at the recommended rate (89 ml/acre) 

Untreated control

Treatments for grassy weed control
Avadex MicroActiv (a.i. triallate, group 15) – pre-seed application at the recommended rate
Treflan (a.i. trifularin, group 3) - pre-seed application at the recommended rate
Fortress MicroActiv (a.i. triallate and trifluralin; group 3 and 15) - pre-seed application at the recommended rate 

Focus (a.i. pyroxasulfone and carfentrazone-ethyl; group 14, 15) - pre-seed application at the recommended rate 

Assure II (a.i. quizalofop-p-ethyl; group 1) – in-crop application at recommended rate 

Poast Ultra (a.i. sethoxydim; group 1) - in-crop application at the recommended rate 

Select (a.i. clethodim; group 1) – in-crop application at the recommended rate 

Everest (a.i. flucarbazone; group 2) - in-crop application at the recommended rate 

Simplicity (a.i. pyroxsulam; group 2) - in-crop application at the recommended rate 
Untreated control



Locations

  • Lethrbidge, Alberta - Farming Smarter
  • Vegreville, Alberta - InnoTech Alberta
  • Falher, Alberta - SARDA Ag Research

Measurements

  • Crop tolerance – 5-7, 10-14, 18-21, and 35-40 days after application/emergence
  • Herbicide efficacy – 5-7, 10-14, 18-21, and 35-40 days after application/emergence
  • Crop yield and biomass

Results

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