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The Ohio Prohibited Noxious Weed Level of Concern table is an overview of all 21 prohibited noxious weeds and their categorized
level of concern. The categories for evaluation relate right-of-way vegetation management issues and the concerns that each weed
presents. See the How to Use This Guide section for complete information on the categories.
GENERAL RIVM GUIDELINES
•
Scout roadsides during biweekly roadside inspections and
post management activities for prohibited noxious weeds. Be
cognizant of life cycles and flower timing.
•
Document noxious weed sightings and size of infestations.
•
Verify identification of plants before planning an application.
•
Determine proper timing of treatments to achieve adequate
control.
•
Measure the length and width of the area you intend to control
to caluculate acreage.
•
Determine proper herbicide and mix additives for desired
vegetation control.
•
Always calibrate spray equipment before making herbicide
applications.
•
Check water quality as necessary per label requirements and
use adjuvants when recommended in product labels.
•
Refer to the herbicide label for personal protective equipment
(PPE) requirements, use rates, mix instructions, tank mix
partners, and restrictions.
•
Promote desirable vegetation that will outcompete and suppress
the spread of prohibited noxious weeds.
•
After controlling prohibited noxious weeds through spraying
or mowing, clean equipment, clothing, footwear, and tools to
reduce spread of seeds or plant fragments.
•
Dispose of seeds, plant parts, and other materials from an
infested site in an infested area to avoid spreading to new sites.
•
Always wash hands after handling equipment possibly
contaminated with poisonous plants and herbicides.
•
Monitor herbicide applications, mechanical, and cultural control
efforts for effectiveness.
•
Rotate herbicides every year or as needed to manage herbicide
resistance in target weeds.
•
Keep records of applications, including: date, time, weather,
area treated, herbicide, target weed, and control results.
•
Do not store mixed herbicides for extended periods as efficacy
will be greatly reduced.
•
Always triple rinse when changing herbicides or preparing to
store spray equipment.
GENERAL RIVM GUIDELINES AND LEVEL OF CONCERN
IS
THE
LAW
THE
LABEL
REMEMBER:
low high
OHIO PROHIBITED NOXIOUS WEED LEVEL OF CONCERN
ohio
distribution
key
roadside
distribution
growth seeds
ability to
dominate
difficulty
of control
APPLE OF PERU
CANADA THISTLE
CRESSLEAF GROUNDSEL
GIANT HOGWEED
GRAPEVINES
JAPANESE KNOTWEED
JOHNSONGRASS
KOCHIA
KUDZU
MARESTAIL
MILE-A-MINUTE WEED
MUSK THISTLE
OXEYE DAISY
PALMER AMARANTH
POISON HEMLOCK
PURPLE LOOSESTRIFE
RUSSIAN THISTLE
SHATTER CANE
WILD CARROT
WILD MUSTARD
WILD PARSNIP
