Introduction

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Barley – See Small Grain Cereals
Scouting for insects in Beans (Dry Beans)
Belowground Feeders and Cutworms
• Seedcorn Maggot
º Typical Damage: Seedcorn maggot attacks bean seed, preventing sprouting or weakening seedlings. The yellowish
white maggot is found burrowing in the seeds or emerging stem. Seedcorn maggots are usually most severe in
wet, cold seasons and on high organic matter soils.
• Cutworms
º When and How to Monitor: To find cutworms, dig in the soil to a depth of 2.5 to 5 cm at the base of recently
damaged plants.
º Nominal Threshold: Treatment is warranted when one cutworm or more is found per metre of row and the larvae
are still small (less than 2 cm long).
Sap Feeders
• Leafhoppers
º Typical Damage: Foliage becomes dwarfed, crinkled, and curled. Small triangular brown areas appear at the tips of
leaves, gradually spreading around the entire leaf margin.
º When and How to Monitor: Leafhopper adults are quick and can be observed by running your hand over the top
of the plants as you approach them and observing adults that fly off the plants. On the same plants, turn over each
leaf to determine the number of nymphs per trifoliate.
º Economic Threshold: Unifoliate stage – 0.25 leafhoppers per trifoliate; second trifoliate stage – 0.5 leafhoppers per
trifoliate; fourth trifoliate stage – 1.0 leafhopper per trifoliate; first bloom – 2.0 leafhoppers per trifoliate.
Defoliators
• Grasshoppers
º Economic Threshold: Substantial yield loss does not occur until up to 35% defoliation occurs before bloom and
15% after bloom.
Beans (Dry) Insect Management Chart
Insect
Wireworms
Seedcorn
Maggot
Insecticide
(and insecticide group 1 )
Rate/Acre
Preharvest
interval (days)
Belowground and Surface Feeders
Application
(A=aerial;
G=ground)
LD 50
(Mammalian
Toxicity) 2
Cruiser Maxx
A seed treatment combining Cruiser Maxx Beans and Vibrance 500FS.
Vibrance Beans (N)
Cruiser 5FS (N) 83 ml/100 kg seed Must be applied in commercial seed treatment facilities.
Stress Shield 600 (N) 104ml/100kg of seed Seed Treatment
Sow seeds as shallow as possible in a warm, well-prepared seedbed.
If manure is used, apply and plow it under the previous fall.
Cruiser Maxx Vibrance A seed treatment combining Cruiser Maxx Beans and Vibrance 500FS.
Beans (N)
Cruiser 5FS (N)
50-83 ml/
100 kg seed
Must be applied in commercial
seed treatment facilities.
Cutworms Coragen (D) 101 ml 1 A or G >5,000
Matador/Silencer (P) 34 ml 14 (Matador) A or G 64-110
21 (Silencer)
Sap or Fluid Feeders
Lygus Bugs Matador/Silencer (P) 34 ml 14 (Matador) A or G 64-110
21 (Silencer)
Cygon 480-AG (OP) 0.28-0.40 L 7 A or G 60-450