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Biological
Weed
Control
Using Insects - A Field Guide For Montana
This is a large .pdf file of this guide.
This guide is available at most County
Weed District offices.
Note:
this guide is being updated summer, 2016.
One thousand mixed leafy spurge flea beetles
just collected, sorted and placed into an insect
container with spurge foliage for transport.
Photo by: Todd Breitenfeldt, July 2013.
Cyphocleonus achates - the knapweed root
boring weevil on a spotted knapweed flower.
This is a newly released weevil that we collected
and the land manager released on an infestation of
the weed.
Photo by: Grif Heath, 8-2013.
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Jaapiella ivannikovi gall
on Russian knapweed
(Centaurea
repens).
These gall forming midges are a new biological
control agent for Russian knapweed. We
are now growing these in our insectary at
Whitehall, MT. 6-18-13. We will
have these available for release on very
selective sites this summer. You must be
able to mow or weed-eat the site 1-2 weeks
before the release date to stimulate the
production of new Russian knapweed
shoots. This new shoot growth stimulates
the midge larvae to emerge as adults, lay eggs
in the new stems and form new galls.
In Montana, contact: Todd Breitenfeldt
406-498-5236 for more information.
Photo by: Todd Breitenfeldt,
June, 2013.
Useful links:
http://www.eddmaps.org/biocontrol/species/subject.cfm?sub=59841
http://www.blm.gov/or/districts/spokane/plans/files/Jaapiella_ivannikovi_FONSI2.pdf
http://www.aphis.usda.gov/plant_health/ea/downloads/jaapiella_ivannikovi.pdf
Some of the 2016 Whitehall Project crew
collecting Oberea and leafy spurge
flea beetles south of Whitehall, June, 2016.
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Montana War on Weeds
