Hack-and-squirt applications can also be done with smaller trees, but they should have a least a 1-inch stem diameter. A photo of the trunk of a large TOH with a DBH (diameter at breast height) greater than 6-inches (Fig. When applying herbicides to larger TOH trees > 6-inches DBH, then the water-based materials glyphosate (e.g., AquaNeat (brand name)) or triclopyr amine (e.g., Garlon 3A (brand name)) can be used with the hack-and-squirt technique. Most of these trees had canopies above 15 feet. 11) A cluster of 2-3-inch diameter TOH receiving basal bark treatments of triclopyr ester herbicide. When stem diameters exceed 6-inches, then the frill or hack-and-squirt application technique is a better option. It is an excellent choice if trees are tall & non-target vegetation contamination is more likely from foliar applications (Fig. This stem treatment method is also often used the next year as a follow-up after a foliar application & targets the surviving stems. (Triclopyr ester or Garlon 4 Ultra is a restricted use material & requires a pesticide licence to purchase & use). Triclopyr ester (e.g., Garlon 4 Ultra (brand name)) is an oil-based herbicide that has proven effective when the proper treatment timing is followed. When the tree-of-heaven trees targeted have stems diameters ≤ 6 inches, then squirt bottles or hand-can/backpack sprayers can apply herbicides to the lower 12 to 18 inches around the entire stem circumference (Fig. 9) Foliar treatments of herbicides can easily be applied onto this small, short, & tight cluster of tree-of-heaven with hand-can or backpack sprayers. Like all TOH herbicide treatments the best timing will be from mid-July to the onset of fall color or mid-October in NJ. Since both materials are non-selective, foliar applications are best used only if non-target vegetation can be avoided. A spreader-sticker surfactant will need to be added unless the product label states it comes premixed. The non-selective herbicides glyphosate (e.g., AquaNeat (brand name)) & triclopyr amine (water based) (e.g., Garlon 3A (brand name)) are two effective active ingredients that can be sprayed alone, but work best as a mixture. When the tree-of-heaven trees targeted are no taller than 8-10 feet & they are growing in tight clusters, then hand-can or backpack sprayers can be used to apply foliar herbicides (Fig. Naming items from left to right: Spray bottle Hatchet Tape measure & Hand-can sprayer. 8) Some simple tools & spray equipment used to apply herbicides to a tree-of-heaven. Once the tree is removed the translocation of herbicide into the roots is greatly slowed or curtailed.
Furthermore, it is critical to remember to wait at least 30 days after treatment before cutting & removing the tree to allow the systemic herbicide time enough to translocate to the more distant roots. Treating cut tree stumps with an herbicide can be effective at killing trunk sprouts with some tree species, but such an approach will be a mistake with the TOH because of the extensive root suckering (Fig. Even when treatment timing is accomplished, follow-up treatments the next year or two will still be required to attain complete success. If this treatment window is missed, then the herbicide will not achieve maximum root injury & applications will only provide above ground shoot injuries or “top kill.” The TOH is a difficult tree to remove because of its resprouting capabilities & wide-ranging root system. To achieve best results when applying herbicides to the TOH, then the mid-July to mid-October optimum treatment timing needs to be followed.
The former woods at far-left were removed & replaced with athletic fields.
6) A cluster of tree-of-heaven trees growing along a former woods-lined border next to a parking lot.
0 kommentar(er)
