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Safety Precautions
Worker Safety & Re-entry
Some pesticides can be hazardous to people. Following
pesticide label information and BC Workers’ Compensation Board
Act and Regulations helps keep workers safe. To help keep
workers safe:
- Post warning signs that state when treated areas can be
re-entered.
- Only allow workers into treated areas during restricted
entry intervals if they use the proper protective clothing.
- Make sure workers wear proper protective clothing when
mixing, loading, or applying pesticides.
- Store pesticides in a locked area.
- Make sure people applying pesticides have been trained on
pesticide application, mixing, loading, disposal, clean-up,
emergency procedures, and safety.
- Have emergency wash water available at all mixing, loading
and application sites.
- Post emergency phone numbers.
Re-entry into Treated Areas [top]
People can be exposed to pesticides if they enter a treated
area too soon after application. When treated plants are touched
during work activities such as weeding, thinning, or brushing
against plants, some pesticide may be transferred to skin.
People in treated areas may also breathe fumes from a recent
pesticide application. Restricted entry intervals or re-entry
times have been established to prevent people from being exposed
to pesticides immediately after application.
A restricted entry interval (REI) or re-entry time is the
time after the end of a pesticide application during which entry
into the treated area is restricted. This time allows residues
to disperse and not pose a risk.
Restricted Entry Intervals on Pesticide
Labels
REI’s or restricted entry intervals are on some pesticide
labels. When a REI is on a label, the REI must lapse before
people can re-enter a treated area. If people need to enter a
treated area before this time has lapsed, they must wear
protective equipment. The pesticide label will say what
protective equipment is needed.
Before, there were very few REI’s on pesticide labels. Now
more and more pesticide labels have REI’s. Always check the
pesticide label for REI’s. Current pesticide labels are on the
PMRA web site and can be accessed through the
Pesticide Label Section of this web site.
Different pesticides will have different REI’s. Each
pesticide has a different acute oral, dermal, and inhalation
toxicity. Each pesticide also has a different potential for
other adverse effects. Therefore, the REI for each pesticide is
different.
Each pesticide may have one or more different REI’s.
- Since different rates are used for each crop, the REI can
vary between crops. For example, the REI for raspberries could
be 7 days while the REI for apples could be 14 days.
- The type of work activity also affects the REI. This is
because the amount of human contact with treated foliage
varies. For example, a REI could be 14 days for thinning, but
only 48 hours for irrigating.
- The amount of rainfall can affect the REI. Some labels
increase the REI in areas where there is less rainfall.
Restricted Entry Intervals of Worker’s
Compensation Board
The BC Workers’ Compensation Board Regulations for
Occupational Health and Safety have restrictions for re-entering
areas treated with pesticides. People may not enter a treated
field until they have waited the following re-entry or
restricted entry interval:
- 24 hours for a slightly toxic pesticide
- 48 hours for moderately or very toxic pesticides.
The relative toxicity of pesticides is in each
Crop Production Guide
and will be in the Toxicity and Hazard Section of this site in
the future. The following categories are used for these ratings:
Category |
Dermal LD50 |
Oral LD50 |
Slightly toxic |
1000 or greater |
>500 |
Moderately toxic |
201 – 1000 |
51 -500 |
Very toxic |
0 – 200 |
0 - 50 |
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