Invasive Removals and Control by Gina Frederick

Removal and continued suppression of invasive plant species is critical for the success of ecological restoration at the marina. Without management, these super-competitor non-natives will out compete desirable native plants, reducing wildlife habitat, biodiversity, and stormwater management. Specific plants which should be prioritized for removal from the marina include:

Loosestrife (Lythrum alicaria)
Honeysuckle (Lonicera japonica)
Autumn Olive (Elaeagnus umbellata)
Multiflora Rose (Rosa multiflora)
Poison Ivy (Toxicodendron radicans)

Control methods for these plants and herbicide specifications are listed below. Content in this section is from Weaner, 2008, listed in references.

Loosestrife: This is an extremely pernicious weed. Because it grows in wet and submerged areas, use of herbicide should be restricted to products approved for aquatic use (Rodeo®). Loosestrife should be sprayed monthly until eradicated. To avoid use of chemicals, weed whack repeatedly from July to late August to prevent flowering and seed production. This method may take years to exhaust the seed bank in the soil.

Honeysuckle: This is an aggressive, semi-evergreen vine that can overrun and smother native vegetation. Herbicide control should be restricted to Rodeo® when sprayed near water. However, for non-aquatic uses, Roundup Pro® or Garlon® can be used. Honeysuckle is best controlled if sprayed from November to March (depending on the weather). Because it is still growing during this time, Honeysuckle is vulnerable to spraying, while natives are dormant and therefore unharmed by herbicides. Plants can also be mechanically removed.

Autumn olive & multiflora rose: These plants are best controlled by spot spraying, cut stump spraying, or by mechanical removal. Herbicides can include Rodeo®, Roundup Pro®, or Garlon®, depending on the proximity to water.

Poison Ivy: This is a particularly problematic plant because of the skin allergy that it causes in so many people. While it is a native plant with wildlife value, it is not appropriate for public use areas. Hand removal of poison ivy is limited to individuals who can tolerate skin exposure. Poison Ivy is best controlled by spot spraying or cut stump spraying. Herbicides can include Rodeo®, Roundup Pro®, or Garlon®, depending on the proximity to water.

RoDeo® is a non-selective, systemic, post emergent herbicide approved for aquatic uses and applications on emerged weeds in all bodies of fresh and brackish water. It is rainfast within 6 hours after application. The active ingredient is Glyphosate.

RounDup pro® is a non-selective, systemic, post emergent herbicide. The active ingredient is Glyphosate. Roundup Pro® is one of the most environmentally benign herbicides. However, it may require a second application, where Garlon® may work with one application. It is particularly effective when target plants are flowering. This herbicide is extremely toxic to fish and amphibians, and so should never be used on or near water.

Garlon® is a non-selective stump and brush herbicide with a residual environmental effect of at least one month.

Wick application: Mix 1 gallon of glyphosate herbicide (Roundup® or  Rodeo®) in 2 gallons of water to prepare a 33% solution. Drag over or rub target plants up and down foliage while plants are growing to achieve best application.

Mechanical removal: Hand pull weeds or use a Weed WrenchTM for small  trees or saplings. Removal should attempt to minimize soil disturbance and compaction, which favors invasives. Weeding is most effective when soils are moist.

Cut stumps: Apply a 50% — 100% herbicide solution to freshly cut surface immediately after cutting. Cover entire cambium area of the cut stem. For best results, use this method late in the growing season when sap is translocated readily to roots.



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