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Services   FCWP bio-control leafy spurge

Biological Controls

FCWP has a long history of success in using biological agents for the control of invasive plants.

spotted knapweed root weevil

Biological controls are, in most cases, insects that suppress the growth and spread of specific species of noxious weeds, either by feeding on them directly or other means.



before after photo leafy spurge flea beetle

The leafy spurge flea beetle, Apthona nigriscutis, helps suppress leafy spurge growth by feeding on the tops of plants during the growing season and on the root hairs throughout the winter.

salt cedar leaf beetle

The salt cedar leaf beetle, Diorhabda elongata, defoliates salt cedar by feeding on the leaves as a larva and adult.

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A mighty midge

Russian knapweed gall midge

The Russian knapweed gall midge, Jaapiella ivannikovi, lays its eggs on the growing tip of a plant, causing a gall to form which reduces the plantís height and ability to produce seeds.

First released in Fremont County in 2009, Jaapiella is now well established and spreading to new areas of the county on its own. FCWP collects hundreds of galls each summer for redistribution to new sites in Fremont County and to other Wyoming weed and pest districts.

Russian knapweed gall midge


Learn more about biological controls in Wyoming from the pages of "Wyo-Bio."