Herbicides
115
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
Environmental Precautions
CleanStart is very toxic to non-target terrestrial and aquatic plants. Use of a buffer strip of untreated vegetation
between the treated area and the edge of water bodies will reduce risk of contamination.
Toxicity
Credit: Very low acute toxicity. Acute oral LD
50
(
rat) = >5,000 mg/kg. Aim EC (carfentrazone): Very low acute
mammalian toxicity. Acute oral LD
50
(
rats) = 4,077 mg/kg. . Very toxic to algae, and much less toxic to fish and
aquatic organisms.
Storage
Store in a cool, dry place and avoid excess heat.
Curtail M
Group 4
Formulation
Product
Company
Active ingredient
Formulation
Container size
Curtail M (PCP# 22764)
Nufarm Agriculture
Clopyralid: 50 g/L + MCPA ester:
280
g/L
Emulsifiable
concentrate
2
x 8 L
Crops and Staging
Crop
Staging
Wheat, spring and durum, barley, oats
3
leaf to just before flag leaf
Timothy for seed production
3
leaf to flag leaf stage
Canaryseed
3
leaf
Flax
5 - 15
cm in height
Timothy for hay or forage (not to be used on export hay to Japan)
Established
Weeds, Rates and Staging
For best results, apply to actively growing weeds in the 1 - 4 leaf (seedling) stage and when Canada thistle is between
10
cm and up to but not including the early bud stage. Poor weed control may result under cool or dry conditions.
Low rate: 0.61 L/acre
burdock
Canada thistle
*
(
low
infestations)
cocklebur
field horsetail
**
flixweed
***
(2 - 4
leaf)
lamb’s-quarters
plantain
**
prickly lettuce
ragweed
shepherd’s-purse
***
(2 - 4
leaf)
stinkweed
***
(2 - 4
leaf)
sunflower, annual
volunteer sunflower
wild mustard
wild radish
High rate: 0.81 L/acre: all the weeds controlled at the low rates plus
annual sow thistle
Canada thistle (medium to high
infestations)
common groundsel
dandelions***
kochia (suppression) (2 - 4 leaf)
perennial sow-thistle**
red root pigweed
Russian pigweed
scentless chamomile (2 - 4 leaf)
smartweed
tartary buckwheat
wild buckwheat
volunteer canola
*
Season-long control, some growth may occur in the fall.
**
Top growth control.
***
Spring rosettes only.
CleanStart (cont’d)