A single glyphosate resistant (GR) kochia plant can produce ~14,000 seeds. While seed longevity is poor, seeds can spread by wind, water and equipment. Rapid identification of resistant plants is key to containing and slowing the spread of GR kochia bio-types into new fields. Patches or groupings of kochia are made up of individual plants that may have different levels of resistance, so scouting patches as well as plants within patches is key to slowing the spread of resistant bio-types.
PSI focuses on evaluating, refining and field-proofing molecular tools to identify and track economic pests of agriculture in the soil, in the air and that are carried by insects. PSI works with researchers and government extension specialists to make DNA based tests relevant and accessible to growers.
Think you have GR kochia- Here’s what to look for: Approximately 2 weeks after an application of glyphosate, scout for green and actively growing kochia plants or patches of kochia plants with individuals showing a range of injury symptoms: from green- no injury to brown- completely dead. The green and actively growing plants can be assayed to determine if they are GR resistant. It is important to collect as much young, green plant material as possible from each green plant, freeze and send for analysis. DNA is obtained from young, green material- once the plant has wilted or dried, much of the DNA is no longer usable.