Envu Solutions – Kochia
Kochia is one of the most difficult-to-control weeds in western Canada because of its early germination, deep root system, prolific seed production, and potential herbicide resistance.
Kochia can quickly overtake rights-of-way and reach heights of 1–1.5 m, blocking sightlines and creating a public safety hazard. Furthermore, kochia can be toxic to livestock and may cause death if consumed in large quantities (over 50% of feed).
Pre-emergent solutions
The majority of kochia seeds do not last more than one year in the soil. Therefore, most kochia problems result from plants that have set seed in the previous year. Applying Esplanade® and Navius® FLEX before kochia emerges delivers the most effective control, especially in areas of western Canada that experience heavy kochia Application type Solution pressure. Applications can be made at any time, except when the ground is frozen or covered in snow. However, studies have shown that fall applications that include Esplanade can increase the efficacy of kochia control as the active ingredient in Esplanade, indaziflam, remains in the top layer of the soil and will be present before germination occurs the following spring.
Post-emergent solutions
Because of kochia’s early germination, fast-growing, deep and branched root system, post-emergent control can vary. Kochia seedlings are frost-tolerant and therefore can germinate in the early spring, enabling kochia to be at advanced stages of growth before other broadleaf weeds are ready to spray. Furthermore, small emerging kochia seedlings have leaves that are densely covered in small, fine, white hairs that can reduce foliar absorption of herbicides by suspending droplets above the leaf cuticle on the leaf hairs. Additional flushes can also occur throughout the growing season, further exacerbating control issues. Applying Navius FLEX to kochia plants when they are 5–10 cm tall can improve control. If kochia plants are taller than 10 cm, or for heavy infestations, include a tank mix partner such as glyphosate as appropriate for the use site. Effective control requires complete spray coverage of the foliage. Use application equipment that gives the best coverage of all kochia plants while minimizing spray drift. Remember, taller plants, railroad ties, guardrails and other obstacles can shield or shadow smaller plants and limit contact with shorter kochia.
No matter what kind of vegetation management problems you’re up against, Envu has a full range of solutions to help you take control.
For more information about kochia, download the solution sheet or contact your local Territory Sales Manager for kochia control strategies specific to your needs.
ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Envu and the Envu logo, are trademarks owned by Environmental Science U.S. LLC. or one of its affiliates. ©2023 Environmental Science U.S. LLC. All rights reserved.