For most brush species, ranchers tend to think of late spring and early summer as the season for herbicide spraying. That is the best time for foliar applications on many hardwood species. But if you run out of time before you run out of brush, you can change your tactics to continue brush control into the fall.
You can spray brush that’s susceptible to foliar application in the fall, or switch to methods of application that don’t depend on leaves to absorb the herbicide.
Basal bark applications aren’t dependent on leaves, and cool fall days may be the most comfortable time for working at individual plant treatment. With Remedy herbicide, streamline basal application and low volume basal application are effective on a wide variety of brush species year-round.
For some species, such as mesquite, optimal control has been achieved by treating anytime the brush has mature leaves, roughly May through September. But later basal applications still provide acceptable control – often better than optimally timed foliar treatments. Compared to foliar applications, basal applications are more consistent from year to year. On greenbriar, dormant season treatment can be just as effective as a growing season application.
With low volume basal application, fall applications have been successful with a mix of 25% Remedy herbicide and 75% diesel fuel. Spray the lower 15 to 20 inches of stem. Wet all sides of the stem, but not to the point of runoff. The method is best suited to slick-barked stems less than 6 inches in diameter.
For streamline basal application, fall applications have been successful with a mix of either 25% Remedy and 75% diesel, or 25% Remedy, 10% penetrant (such as Cide-Kick, Cide-Kick II, AD 100 or Quick Step II) and 65% diesel. Apply the mix with a straight stream nozzle in a 2 to 3 inch wide band completely around the stem. Streamline basal is best suited to slick-barked stems less than 3 inches in diameter.
With streamline basal, the penetrant seems to improve control on greenbriar, yaupon, pricklyash and Texas persimmon. On other species it may not increase control, but it may improve coverage around the stem, especially on cooler days when diesel is more viscous. If the penetrant saves a little time, the additional cost may be made up in labor savings. If you can spray the stem from one side – and still have the solution circle the stem – you can save mixture.
For almost any brush species, an option that’s effective any time of year, including winter, is cutting the brush and then treating the freshly cut stump. For these applications, use a mixture of 25% Remedy and 75% diesel fuel. Spray the sides and outer portion of the cut surface including the cambium. Thoroughly wet the cut surface, stem and root collar, but not to the point of runoff.
For more information on fall brush control methods, contact me at the County Extension office at 940-627-3341.