Introduction

658
Armyworm
continued
Matador /Silencer (P) 34 ml Do not apply within
28 days of harvest or
14 days of livestock
foraging
A or G 64-110
Lannate (C) 0.1093-0.2185kg 20 A or G 30-34
Malathion 500 (OP) 0.60-0.80 L 7 A or G 4302
Malathion 85E (OP) 0.445-0.544 L 7 A or G 5,500
Chlorpyrifos (OP) 0.354-0.486 L 60 A or G 205-418
Slugs Sluggo Professional 10-20 kg G >5,000
Pests of Seed Only
Wheat Midge (a
pest of wheat
only)
Hessian Fly
Wheat Stem
Maggot
Wheat stem
sawfly
Rotate Crops – Continuous wheat cropping encourages higher wheat midge populations.
Resistant Varieties – the following varieties are resistant to feeding by wheat midge:
CWRS varieties: AC Goodeve, AC Unity, AC Fieldstar, AC Shaw, CDC Utmost, AC Vesper, CDC Titanium,
AAC Jatharia.
CPSR Varieties: AC Conquer, AC Enchant, AAC Foray.
CWES variety: AC Glencross.
Durum: AAC Marchwell.
Biological Control - A parasitoid, Macroglenes penetrans, was found to control
an average of 32% of the wheat midge in Saskatchewan.
Chlorpyrifos (OP) 0.336-0.405 L 60 A or G 205-418
Lagon /Cygon 480 EC /
0.40 L 35 A or G 60-450
Cygon 480-AG (OP)
Stem-Borers
• Never plant wheat in the same field 2 years in a row in areas where Hessian flies are a problem.
• The spring wheat cultivar Superb is partially resistant to the Hessian fly.
• Early seeded spring wheat is less susceptible to stem breakage caused by Hessian fly than later seeded wheat.
• Winter wheat planted in September will likely be free of Hessian flies.
Crop rotation and stubble cultivation may reduce populations.
Solid-stem wheat varieties (such as the hard red spring wheat varieties AC Lillian, AC Abbey and AC Eatonia,
and the durum variety AAC Raymore) can reduce damage by wheat stem sawfly larvae compared to susceptible
varieties, however the level of control can vary depending on environmental conditions.
ALWAYS CONSULT THE INSECTICIDE LABEL BEFORE APPLYING ANY INSECTICIDE.
1
Insecticide Group: Sp=spinosyns, N= neonicotinoids, P=pyrethroids, C=carbamates, OP=organophosphates.
2
LD 50
values represent the relative toxicity of a pesticide. They represent the dose (in mg/kg body weight) that will kill 50% of the
test animals. Thus the lower the number the greater the toxicity. Values given are for oral LD 50
.