Ag
Weeds
In simple terms a weed is just
a plant out of place, however, managing some of these weeds is not
a simple task. Noxious weeds are invasive non-native plants whose
control is mandated by law. These plants pose a serious threat to
our native habitats and impact recreation and agriculture. They
have displaced 130 native Colorado plants on 553,163 acres* in Colorado
(*Colorado Dept of Agriculture)
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2009
Small Acreage Weed ID and Control Workshops
Weed ID Service
You may submit weed samples in our office for identification.
Call 303-678-6238 with questions.
Weed
ID Sample Guidelines
Weed
ID Form
Identification
Colorado
Weed Management Association (good for noxious weeds ID)
USDA
NRCS Plants National Database (good for searches for ID of weeds
and native plants)
USDA
ARS Germplasm Resource Identification Network (good for advanced
searches of all plants)
Timing
Weed Growth Chart
Contractors
Commercial
Contractors for spraying, tillage, mowing, seeding, etc.
Questions
to Ask Small Acreage Contractors
Colorado Department of Agriculture Pesticides
Program
For
commercial and private applicator licenses, product registration,
individual sensitivity, etc.
Poisonous Plants
Online
Guide to Poisonous Plants
Factsheets
Links to factsheets
for specific weeds (invasive species) NEW
See New Factsheets
Links to general
weed managment factsheets
Creating
an Integrated Weed Management Plan
Local
Boulder
County Parks and Open Space Weeds Division
City
of Boulder Open Space and Mountain Parks
City
of Longmont
City
of Boulder
State
Colorado
Environmental Pesticide Education Program
Colorado
Department of Agriculture Pesticide Applicator Program
Colorado
Department of Agriculture Pesticide Registration Program
Product Label Info
Herbicide
Label Search
Weed Law
Colorado
Noxious Weed Act of 2003
Colorado
Department of Agriculture Noxious Weed Management Plan
Boulder
County Weed Managment Plan
Mechanical Weed Control
SARE
Book - Steel in the Field (mostly for crop production)
Local
Goat Herds for Weed Control
Biological Weed Control (Insects)
Colorado
Department of Agriculture Biological Pest Control (scroll down
page for contact info)
Integrated
Weed Control
Cultural Weed Control - A Healthy Stand of
Grasses is the Best for Weed Suppression
Seed
for reveg
Seeding
Dates for Boulder County
Custom
seeding for reveg
Grass
Seeding Info (site prep specs from Adams Co, see links below
for species recs and rates for Boulder Co)
Dryland
pasture seed mix specs from Boulder County NRCS - call 303-678-6383
for more info
Irrigated
pasture seed mix specs from Boulder County NRCS - call 303-678-6383
for more info
Native grass
seed mix specs from Boulder County NRCS - for loamy to clayey
soils
Native grass
seed mix specs from Boulder County NRCS - for sandy soils
Boulder
County Natural Resources Conservation Service (NRCS) (revegetation
and irrigation projects, cost share, etc.)
Chemical Weed Control
Herbicide
Formulations
Herbicide
Surfactants and Adjuvants
Herbicide
Behavior in Soils
Herbicide
Selectivity and Performance
How
Surfactants Work
Herbicide
Performance During Drought
Sprayer
Calibration Fundamentals
Single
Nozzle Sprayer Calibration
Retail Sources of Herbicides in Boulder County
Herbicide
list as Excel document
Organic Weed Control
Analysis
of Canada thistle Biomass Reduction from NOP Approved Non-Tillage/Cultivation
Control Methods Thomas Saielli and Adrian Card
Cornell
Organic Weed Mgt Website
ATTRA
Weed Control Publications
Colorado
Pesticide Education Program - Organic Control
Acetic Acid ("Vinegar") Herbicides
Household, culinary vinegar is 5% acetic acid. While
this concentration can provide some control, most of the commercial
products are 8-25% acetic acid.
WHILE PERCEIVED AS LESS TOXIC HERBICIDES, THESE ACETIC
ACID PRODUCTS HAVE HUMAN HEALTH HAZARDS THAT SHOULD BE TAKEN SERIOUSLY.
WEAR APPROPRIATE PERSONAL PROTECTIVE EQUIPMENT (PPE) - EYE/FACE
SHIELD, RESPIRATOR, CHEM GLOVES, CHEM APRON, ETC.
Acetic acid concentrations over 11% can cause burns
upon skin contact. Eye contact can result in severe burns and permanent
corneal injury. The 25% acetic acid concentrations registered through
EPA and the states for commercial use all have restricted entry
intervals of 48 hours and list personal protection equipment to
be used by the applicator.
Products
Approved for Use (Registered) with the Colorado Department of Agriculture
as 25(b) Exempted Products
25(b)
Products Explained
New
Mexico State University Article
Iowa
State Article
Purdue
University Article
Cornell
Study
University
of Florida Study
Last updated 5/04/09
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