Insecticides
401
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
Crops
Insects controlled
Rates per acre
Malathion 500 Malathion 85 E
Corn (grain/forage)
Earworms, European corn borers
0.91 - 1.1
L
0.45 - 0.54
L
Lentils
Grasshopper
0.71
L
0.34
L
Peas
Pea aphid, leafhoppers, pea weevil, spider mites
0.91
L
0.44
L
Pasture
Grasshopper
0.41 - 11
L
0.11 - 0.35
L
Potato
Aphids, leafhoppers, Colorado potato beetles, spider mites
0.61 - 0.91
L
0.3 - 0.44
L
Sugar beet
Flea beetle
0.45
L
0.22
L
When to Apply
Foliar spray
Legumes
:
When economic thresholds are reached. Do not apply to legumes in bloom.
Sweet clover
:
Spray field margins of first-year clover in late summer or early fall when migration of weevil adults is
occurring.
Canola, flax
:
When bees are absent from field and temperatures is above 18°C.
Sugar beets
:
At 3 - 5 leaf stage when insects or damage first appears.
Stored grain treatments
To be used only for stored cereal grains and corn. As grain is being loaded or turned into final storage. Surface
protectant – immediately after grain is loaded into storage.
Storage protectant
:
Prior to filling of grain storage structures.
Crop
Insects controlled
Liquid
(
per 1,000 kg grain)
2.0%
Dusts
(
per 1,000 kg grain)
Barley
Confused flour beetle, flat grain
beetle, grain mites, granary weevil,
Indian meal moth, lesser grain
borers, red flour beetle, rice weevil,
rusty grain beetle, saw-toothed grain
beetle
12
g
520
g
Corn
10
g
–
Oats
17
g
735
g
Rye
10
g
450
g
Wheat
10
g
415
g
Barley, corn, oats, rye, wheat
Indian meal moth
300
mL/100m
2
of grain
surface
–
Note: The Canadian Grain Commission does not recommend the use of grain protectants. Malathion is more effective in dry grain than in tough or damp
grain because the pesticide breaks down rapidly.
Application Information
Foliar treatments
: (
Malathion 500 and 85 E): Ground and aerial application.
Water volume
:
Potato pests: 400 L/acre.
Stored grain treatments
:
Apply with sprayer or dust applicators.Water volume: 10 - 20 L water; Indian meal moth
(
surface treatment) 5 - 10 L water.
Incorporation
:
Add to grain as it is being augered, or scatter proper amount of dust on each load and cut in with
shovel before dumping.
Application Tips
All crops
:
Apply when day temperature is expected to exceed 20°C. Do not apply to plants in bloom. Stored grain:
To protect from Indian meal moth, spray evenly over the surface of uninfested grain and rake to a depth of 15 cm.
Where special application equipment is not available, any type of low pressure sprayer holding 5 L or more can be
used. Apply spray to the grain stream as it is being elevated into storage.
Before storing new grain
:
Thoroughly clean up old grain and debris from bins, elevators or grain handling
equipment. Remove and burn all sweepings. After cleaning the premises, apply a residual malathion spray to walls,
floors and machinery in grain elevators or farm storage. Force spray into cracks and crevices. Apply 5 L of spray/
100
m
2
of surface area using a coarse wetting spray. Wait until spray has thoroughly dried before storing grain in
Malathion (cont’d)