Insecticides
392
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
Crops
Insects controlled
Rate per acre Specific comments
Potato
Colorado potato beetle,
leafhopper, potato flea
beetle, tarnished plant bug
40 - 60
mL
Apply when insects are present or signs of insect feeding are
evident. Repeat as necessary to a maximum of 3 applications
per year as a ground application. Maximum of 2 applications if
applied by air. Use the higher rate under severe infestations.
Canola, rapeseed,
mustard
Beet webworm, flea
beetle, Bertha armyworm,
clover cutworm,
diamondback moth
(
larvae), grasshopper,
lygus bugs
40 - 60
mL
Application should be made when the insects are actively
feeding. Under heavy infestations, use the higher rates. Apply
once per year.
Cabbage seedpod weevil
80
mL
Apply once per season when adults are seen on flowerbuds or
developing pods.
Wheat, barley,
oats, flax, lentils
Cutworm, clover cutworm
(
flax only), beet webworm
(
flax only)
80
mL
Apply once per season when larvae are present and feeding. Do
not disturb soil after application.
Grasshoppers
40 - 60
mL
Apply when the grasshoppers are in the 2-4 nymphal stage.
Sugar beets
Cutworm
80
mL
Apply once per season when larvae are present and feeding. Do
not disturb soil after application.
Sunflower
Sunflower beetles
40
mL
Apply when sunflower is cotyledons to 2 leaf stage. Apply once
per season.
Rangeland, pasture
and roadsides
Grasshoppers
40 - 60
mL
Apply when the grasshoppers are in the 2-4 nymphal stage. The
higher rate should be used when the proportion of mature and
late nymphal stages in the population are high. Do not apply
more than 3 times per year.
Application Information
How to Apply
:
Ground and aerial application with the exception of alfalfa and corn, which require ground
application only.
Water volume
:
Ground: Alfalfa - 40 - 120 L/acre; Field corn - 100 L/acre minimum; Potatoes - 80 - 200 L/acre,
Canola, mustard - 40 L/acre; Cereals - 40 - 80 L/acre; Sugarbeets - 40 L/acre.
Aerial
: 4.4 - 8.8
L/acre.
Application Tips
Best control is achieved by morning or evening applications. Do not spray under a strong temperature inversion or
when temperature exceeds 25°C. With severe flea beetle and grasshopper infestations, spray fence rows and a
15
metre strip into adjacent fields.
How it Works
Deltamethrin is a non-systemic, synthetic pyrethroid that works by contact and ingestion. Speed of kill depends on
target insect and environmental conditions. Death can occur within 2 hours.
Restrictions
Rainfall
:
Do not apply within 1 hour of rain.
Grazing
:
Beef and dairy cattle may graze treated fields immediately after application.
Pre-harvest Interval (days)
:
alfalfa (20), barley (40), canola (7), flax (40), lentils (30), mustard (7), oats (31),
potatoes (3), sunflower (70), wheat (40), sugarbeets (100).
Environmental Precautions
Decis is toxic to fish and aquatic organisms. Overspray or drift into aquatic areas must be avoided. Do not apply
where streams, lakes, ponds or water used by livestock or for domestic purposes may be contaminated. Maintain a
minimum
30-
metre buffer for ground application and a
minimum
100-
metre buffer for aerial application.
Applications should not be made when wind or rain could favour drift or runoff into lakes and ponds.
Decis (cont’d)