Dry Edible Beans: Seedcorn Maggot (Delia platura)

Excerpt from Chapter 5, Field Crop Protection Guide, Order this publication

Table of Contents

1. Description
2. Integrated Pest Management Options
   • Seed Treatment
     • thiamethoxam – Cruiser 5 FS
     • thiamethoxam + metalaxyl-M + fludioxonil - Cruiser Maxx Beans
     • diazinon + captan + thiophanate-methyl – DCT
3. Related links...

Description

The seedcorn maggot is a small, yellowish-white, headless, legless larva. The body tapers to the front with two small mouth hooks protracting. The maggots burrow into germinating seeds and the below-ground parts of emerging seedlings, producing weak seedlings. The adults resemble a small housefly that is slender, light grey and approximately 5 mm in length.

Image 1. Seedcorn maggots are small, headless, legless larvae that burrow into germinating seeds and weaken the seedling.

Integrated Pest Management Options

Seedcorn maggot problems are rare in Ontario. Risk factors include cool, wet springs when germination is delayed. In fields at high risk, including early-planted fields where large amounts of manure, green manure or residue have recently been incorporated, use Cruiser seed treatment.

Seed Treatment

Fields at high risk, including early-planted fields where large amounts of manure, green manure or residue have recently been incorporated, should use Cruiser seed treatment.

Comments
For use in commercial seed treaters only. Use higher rate when expecting high insect populations. May be mixed with Apron Max RTA for control of seed and soil-borne pathogens. Do not graze or feed livestock on treated areas for 45 days after planting.

Comments
For commercial application only. Compatible with Rhizobium-based inoculants. Check with inoculant manufacturers for details prior to use. Do not graze or feed livestock on treated areas for 45 days after planting. For anthracnose control, tank-mix with 10 mL of Dynasty 100FS per 100 kg seed.

Comments
Available in a 400-g container that will treat 77 kg of dry bean seed. Use full rate and ensure good coverage by applying as a slurry. To make slurry, use 520 g seed treatment/L of water.

Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Dry Edible Beans: Seedcorn Maggot
• Insects
• Dry Edible Beans