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Channel Field Check Up Good Timing Is Key To Help Maximize Glyphosate Effectiveness
JOE BUNCK
LUBBOCK, TEXAS
There are many factors that can influence the effectiveness of a glyphosate application including water stress, weather conditions and mechanical or insect damage to weeds. Using the Channel® Field Check Up Series, your Seedsman can help you evaluate your fields and determine the best timing for spraying weeds.
For optimum control, weeds need to be healthy and have a good plumbing system, technically speaking, an intact xylem and phloem. Glyphosate, the active ingredient in Roundup® brand agricultural herbicides, relies on translocation so the herbicide can move throughout the plant. Channel Seedsman can work with farmers to evaluate the weather and field conditions that might weaken weeds and compromise herbicide control.
If the spring has been dry, water-stressed weeds may have thickened cuticles, which are more difficult for herbicides to penetrate. Wilted foliage, that pinches the xylem and phloem, also inhibits translocation of the herbicide. To help overcome these application challenges, farmers can use a higher application rate, add ammonium sulfate or wait a few days until stress is alleviated to improve efficacy when applying Roundup® brand agricultural herbicides.
Dust particles on weeds can bind glyphosate, making it less available for absorption into the plant. This scenario is often marked by poor weed control in wheel tracks. If a second herbicide application is necessary, if possible, avoid driving in the previous tracks.
In cold spring weather, glyphosate may take longer to control weeds stressed by frost or chilly temperatures. Once again, this is an issue with the herbicide not being able to effectively translocate within the plant. Weed control will decrease when herbicides are applied to desiccated plant tissue or if leaves are not firmly attached to the plant stem. For optimum weed control, wait a few days and then apply herbicide to new plant growth.
In addition to weather, mechanical and/or insect damage can harm the xylem and phloem in weeds and inhibit translocation. Tillage and stem-boring insects may visibly damage weeds above the soil surface, while below the damage the plant will remain green and viable. Giant ragweed and marestail are two examples of weeds – when translocation is inhibited – that are capable of surviving an application of glyphosate.
If re-treatment with glyphosate is necessary, allow time for weeds to recover and resume growth so you can target new, healthy tissue. Consider adjusting your application rates to compensate for weeds that are older, taller, and probably even more difficult to control. Remember: for the best results and maximum control with Roundup® brand agricultural herbicides, apply the product when weeds are healthy and actively growing.
Contact your Channel Seedsman to help put a plan together that covers the entire season. To find the Seedsman nearest you, go to channel.com and use the Seedsman Locator. ∆
JOE BUNCK: Channel Agronomist
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