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Images show several types of insects used to control noxious weeds. Many individuals and agencies use insects in combination with other management methods to control noxious weeds. When selecting types of control options, you need to consider weed species, size of infestation, location and access, and possible environmental effects. What may be good for one location may not be for another.

Insects for Noxious Weeds

Feeding damage by Stem Boring Weevils (Mecinus janthinus) on Dalmatian Toadflax.

Bore holes from stem weevils.

Stem Boring Weevil emerging from a split Dalmatian Toadflax stem. These insects emerge in the May and June.

More feeding damage by stem weevils.

Weevil on a toadflax.

2 weevils on a plant of toadflax up Davis Gulch.

Newly released weevils on open lands. When releasing insects, dump the container in one spot to increase your chances of having a successful site. A typical release size is 100 insects.

Seed Head Weevil (Larinus minutus) on Diffuse Knapweed and are also found on Spotted Knapweed.

An infestation of knapweed with several exit holes. This was found in the right of way next to private property in city limits.

Closeup of exit holes.

In this picture, a Seed Head Weevil and a Seed Head Gall Fly (Urophora afinis) are on a plant of Spotted Knapweed. Both insects target knapweed seeds.

There is a Seed Head Gall Fly in this photo, can you find it?

They are very small insects.

How many Seed Head Weevils can you find in this photo? Hint look at the flower.

2 Weevils covered in pollen on a knapweed flower .

Newly released Root Weevils (Cyphocleonus achates). A typical release is 100 insects.

This little guy was found along a right of way in the city limits.

Can you find 3 Root Weevils in this picture?

Root Weevils with their coloring make them very difficult to spot once released.

Weevils ready for release. Notice their coloring and their size. Of the insects released by the city, these are the largest.

Samples of Violations

Trip hazard involving tree roots.

Overhanging tree branches cause obstructions for pedestrians. Trim branches to the edge of the sidewalk and up 8 feet to allow pedestrians and bicycles to pass safely.

RV parked across the sidewalk is an example of a sidewalk obstruction.

Nuisance weed violation that resulted in non-compliance action.

Same location as previous photo.

Snow that was not removed from the sidewalk in a timely manner. Upon receiving notice, owners shoveled the sidewalk.

Trip hazard caused by a vehicle hitting a tree pushing up the concrete.

Overhanging tree branches cause obstructions for pedestrians. Trim branches to the edge of the sidewalk and up 8 feet to allow pedestrians and bicycles to pass safely.

Tree branch debris on the sidewalk causing an obstruction.

Nuisance weed violation on a vacant lot. Upon receiving notice, owners mowed the lot.

Snow that was not removed from the sidewalk in a timely manner. Upon receiving notice, owners shoveled the sidewalk.

Concrete deterioration causing a trip hazard. This sidewalk has been fixed.

Trip hazard involving tree roots at the same location as the previous photo.

Shrubs growing over the sidewalk not allowing pedestrians to pass.

Snow that was not removed from the sidewalk.

Trip hazard involving tree roots that changed elevations on sidewalk sections. The tree was not removed to fix this hazard and the sidewalk was relocated to accommodate the tree.

Shows shrubs growing over a sidewalk. All plant material needs to be trimmed to the edge of the sidewalk and to a height of 8 feet.

Images are showing various types of violations such as obstructions that block sidewalks, cracks and broken sidewalks, tall weeds, and snow and ice left on sidewalks.