Corn: European Chafer (Rhizotrogus majalis)

Excerpt from Chapter 2, Field Crop Protection Guide, Order this publication

Table of Contents

1. Description
2. Integrated Pest Management Options
   • Seed Treatment
     • clothianidin – Poncho 250
     • thiamethoxam – Cruiser 5 FS
3. Related links...

Description

European chafer larvae are white and C-shaped with an orange-brown head and dark posterior. This pest can be distinguished from other white grubs by its Y-shaped pattern of anal bristles known as "rasters," located on the underside of the last abdominal segment of the larva. The adult is a medium-sized, light-brown, fawn-coloured, oval scarab beetle, closely resembling the native June beetle.

Image 1. European chafer larvae are white with an orange-brown head and dark posterior. They are distinguished from other white grubs by the Y-pattern of the anal bristles (rasters).

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Integrated Pest Management Options

Avoid planting corn if grub population is extreme – plant soybeans instead. 2 or more larvae per square foot indicates the need for control. If grub populations are high (i.e., 6 or more grubs per square foot) using the higher rate of seed treatment is recommended.

See OMAFRA Publication 811, Agronomy Guide for Field Crops, for further information on insect biology and management options.

Seed Treatment

Comments
For use in commercial seed treaters only. Seed-applied insecticides can affect seed drop and final plant stands. Use talc or graphite according to planter recommendations to ensure accuracy.

Comments
For use in commercial seed treaters only. Do not graze or feed livestock on treated areas for 45 days after planting.

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Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Corn: European Chafer (White Grub)
• Insect
• Corn

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