The practice of using herbicides from multiple groups in sequential applications to target the same weeds and will include soil-applied herbicides combined with pre-seed burnoff, followed by an in-crop herbicide application.

Like its cousin kochia, Russian thistle is an annual weed that is highly adaptable to hot, dry conditions. It grows rapidly with its red-striped stems growing over one metre high with its extensive root system reaching almost two metres down.

The number of grassy weeds resistant to in-crop herbicides is increasing. Dr. Breanne Tidemann, research scientist with Agriculture and Agri-Food Canada in Lacombe, AB, presented some sobering statistics during the FMC Pre-School webinar, AGRC*104: Grassy Weeds in the Prairies: The Pests, the Problems, the Plans.

In this podcast, listen to Dr. Peter Sikkema, Professor in Weed Management for Field Crops, University of Guelph, Ridgetown Campus and Allison Hayward, Field Development Representative from FMC Canada, discuss the benefits of a two-pass weed control program in soybeans.

According to Dr. Peter Sikkema, Professor in Weed Management for Field Crops, University of Guelph, Ridgetown Campus, significant soybean yield loss from weed interference can occur if growers only rely on in-crop herbicides for weed control.