Olson Environmental is now Riparia Environmental - delivering the same trusted service with a fresh new look.
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INVASIVE & NOXIOUS WEEDS

CONTROL & REMOVE THE UNWANTED SAFELY & EFFECTIVELY

We provide comprehensive invasive species and noxious weed control services, holding a Commercial Applicator Pesticide License to ensure proper, legal application of pesticides for safe, effective weed management. 

Washington license number: WA 97510

Oregon license number:  AG-L1090698CPO

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CORE SERVICES

Invasive and noxious weed identification
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We identify invasive and noxious weeds on properties, assess the extent of infestation, and plan control strategies.

Control and removal methods
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Mechanical weed removal (mowers, hand tools)

Using mowers, trimmers, and hand tools, we cut or pull invasive weeds, especially in large areas where manual removal is less efficient.

Field mowing

We regularly mow large fields or open areas to control the growth of invasive and noxious weeds, preventing them from going to seed.

Seed head removal (bagging seed heads)

We physically remove and bag seed heads from invasive plants to prevent further spread, particularly for species that produce large quantities of seeds.

Chemical control (spray tanks, backpack sprayers)

We apply herbicides using spray tanks or backpack sprayers to target invasive species while minimizing the impact on native plants.

Injection treatments (EZ-Ject)

We use tools like the EZ-Ject lance to inject herbicide capsules directly into the stems or trunks of invasive woody plants, providing targeted control with minimal disturbance. This has the added benefit of creating a snag, which has long-term ecosystem benefits - leveraging a negative into a positive. 

Foliar spraying (spray tanks, boom sprayers)

We spray herbicides directly onto the leaves of invasive plants using spray tanks or boom sprayers, especially for large infestations in fields or pastures.

Cut-Stump treatment (herbicide applicators)

We cut invasive plants near the base and immediately apply herbicides to the stump to prevent regrowth.

Biological control

We introduce natural predators or pathogens, such as insects or fungi, that specifically target invasive species, helping reduce their numbers over time without chemicals.

Invasive species
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Emerald Ash Borer (EAB) treatment & identification

We detect signs of Emerald Ash Borer (EAB) infestation, such as D-shaped exit holes, canopy thinning, and increased woodpecker activity on ash trees.

Trunk injection (systemic insecticides)

We use trunk injections of systemic insecticides like Emamectin Benzoate to protect ash trees from EAB. The insecticide circulates throughout the tree, killing feeding larvae.

Soil drench treatment

We apply systemic insecticides as a soil drench around the base of ash trees. The roots absorb the chemical, which is then transported throughout the tree to target EAB.

Storm cleanup, leaf removal, and debris cleanup
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We provide fast storm cleanup services, removing fallen trees, branches, and debris to restore landscapes after severe weather events. We offer seasonal leaf removal and debris cleanup services to keep landscapes clean and prevent clogged drains.

WHAT SETS US APART

We have powerful support

As a subsidiary of an award-winning consulting engineering firm, we offer an integrated approach with a proven track record for success throughout our region.

We know what’s at stake

Our client-centered approach means we collaborate closely with you, tailoring services to your specific project needs and goals.

We know the landscape

With 30-years of experience, we have the certifications, qualifications, and knowledge for all regulatory compliance.

WHAT WE DO

We offer a full range of natural resource-based environmental services for residential, commercial, public works, and retail development. Choose a service badge below to learn more.