Great info - I was looking on my phone and didn't see
@LonewolfNopack prior advice areas (up the thread) - I've added the link / data from the big brains at the OSU on this.
Controlling Non-Native Invasive Plants in Ohio Forests: Bush Honeysuckle
Kathy Smith, Extension Program Director–Forestry, School of Environment and Natural Resources
Annemarie Smith, Invasive Species Forester, Ohio Department of Natural Resources, Division of Forestry
Amur, Morrow, and Tartarian honeysuckle (Lonicera spp.)
https://ohioline.osu.edu/factsheet/F-68
From Factsheet F-68:
Mechanical Control
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Tartarian honeysuckle. Photo by Kathy Smith, OSU Extension, School of Environment and Natural Resources. |
Mechanical control alone is usually not a completely effective method of controlling medium to large bush honeysuckle shrubs. Simply cutting the shrub off at the base will cause prolific sprouting and increase the number of stems. An effective strategy for controlling mature bush honeysuckle will deaden both the above ground portion and the root system, which eliminates the potential for sprouting. This can be achieved most effectively through the use of herbicides.
(see Table 1 for foliar herbicide options). Also, be cautious of the timing of removal. These types of removals may best be done when the ground is frozen or at a minimum when the ground is not wet. Removing vast amounts of plants may result in large areas of disturbed soil and care should be taken to minimize any erosion and compaction potential created when the plants are removed.
Foliar Spraying
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Honeysuckle sprouts as a result of cutting off the shrub at the ground. A follow-up foliar herbicide application can now be applied. Photo by Kathy Smith, OSU Extension, School of Environment and Natural Resources. |
Foliar spraying is a method of control in which diluted herbicide is sprayed directly on the leaves of the targeted plants. This can be a very effective method of controlling honeysuckle but should only be used when the target plants are within easy reach of the sprayer. Spraying directed at less accessible plants can damage or kill valuable non-target plants through herbicide drift or overspray. In addition, care needs to be taken to ensure that herbicides are sprayed to wet the foliage but not to the point of runoff.
Bush honeysuckle leaves remain green and active late into fall (mid to late October) when most native plant species have gone dormant. Foliar applications of some herbicides can be used at this time with little or no impact to non-target species especially after the first hard frost in the fall. Herbicides recommended for foliar spraying of bush honeysuckle are listed in Table 1.
Table 1: Herbicides recommended for foliar treatment of bush honeysuckle. | | |
Herbicide | Example Brand Names | Comments1 |
glyphosate | Roundup, Accord, and other herbicides containing at least 41% glyphosate | Apply solution of 2% herbicide in water (vol/vol) when leaves are green; add a surfactant if not in herbicide. |
2,4-D + triclopyr | Crossbow | Wet foliage and stems with 1–1.5 gallons Crossbow in 100 gallons water; spot spray with 0.25 pt (1/2 cup) Crossbow in 3 gallons water. |
triclopyr | Garlon 3A, Tahoe 3A | Apply solution 3–5% (vol/vol) of herbicide in water when leaves are green.* |
*A surfactant at .25% vol/vol rate may be added to the various triclopyr formulations when foliar spraying.
1These comments are not intended to be a substitute for the herbicide labels. To ensure the safe and effective use of the herbicides recommended in this publication read the label and SDS (Safety Data Sheet). | | |
Cut Stump Herbicide Treatment
Cut stump treatments are a very effective method for controlling many undesirable woody shrubs and work well on bush honeysuckle. This method involves cutting the shrub off close to the ground and applying an herbicide to the cut surfaces (and sometimes the bark) with a spray bottle, paintbrush, roller, or wicking device.
Whether to use an oil or water soluble herbicide depends on the timing of the herbicide application after the cut. Herbicides carried in water should be applied to the outer 1/3 of the top of the stump
within minutes of making the cut.
Utilize an oil soluble herbicide when planning to cut and later return to treat the stumps. Apply the oil soluble herbicide to the entire top and sides of the cut stump but not to the point of excessive runoff. Apply anytime as long as the stumps are dry and not frozen.
Herbicides (both water- and oil-soluble) recommended for cut stump treatments of bush honeysuckle are listed in Table 2. Late summer, early fall, or dormant season applications have all proven to be effective. Avoid applications during sap-flow (spring) as this lessens the effectiveness of the herbicide application.
Table 2: Herbicides recommended for cut stump treatment of bush honeysuckle. | | |
Herbicide | Example Brand Names | Comments1 |
glyphosate | Roundup, Accord, and others | Apply 20% active ingredient to outer third of cut stem/stump surface immediately after cutting. |
2,4-D + picloram | Pathway, Tordon RTU | Apply undiluted to surface of cut stem immediately after cutting. |
Tordon 101 | Apply undiluted or diluted 1:1 with water. | |
2,4-D + triclopyr | Crossbow | Apply solution of 4% Crossbow in diesel fuel, fuel oil, or kerosene. |
triclopyr | Garlon 4, Garlon 4 Ultra, Tahoe 4E, Remedy, and others | Apply 20% Garlon 4 + 10% penetrate (e.g. Cide-Kick II) in diesel, fuel oil, kerosene, or basal oil (penetrate not needed with basal oil). |
1These comments are not intended to be a substitute for the herbicide labels. To ensure the safe and effective use of the herbicides recommended in this publication read the label and SDS (Safety Data Sheet). | | |
Basal Spraying
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A basal application of herbicide needs to be made to the lower 12–18 inches of the honeysuckles' stems. Photo by Kathy Smith, OSU Extension, School of Environment and Natural Resources. |
A basal application for bush honeysuckle refers to the spraying of a labeled herbicide mixed with an oil-based carrier on the lower 12–18 inches of the stem. The herbicide is sprayed, ensuring that the stems are wet but not to the point of runoff. Basal treatments should only be applied when the areas to be treated are dry and not frozen. The basal treatments recommended in Table 3 should be applied during the dormant season (winter or spring). Due to the arching nature of bush honeysuckle shrubs, access to the lower portion of the shrubs trunk is not always easy to achieve. Care should be taken to ensure that the chemical being applied is reaching the lower portion of the shrub's trunk and not merely being applied in its general vicinity.
Table 3: Herbicides recommended for basal spraying of bush honeysuckle. | | |
Herbicide | Example Brand Names | Comments1 |
triclopyr + imazapyr | Garlon 4 and Stalker | Apply a solution of 15% Garlon 4 + 3% Stalker + 82% Ax-It basal oil mixed by volume. |
triclopyr | Garlon 4, Garlon 4 Ultra | Apply a solution of 20% Garlon 4 in basal oil (Ax-It or Arborchem). Diesel fuel may also be used as a carrier but this requires that a 10% penetrant (such as Cide-Kick II) must also be added. |
2,4-D + triclopyr | Crossbow | Apply a 4% solution of Crossbow in diesel oil, fuel oil, or kerosene. |
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