Dry Edible Beans: Seedcorn Maggot

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Dry Edible Beans: Seedcorn Maggot (Delia platura)

Author:	OMAFRA Staff
Creation Date:	04 July 2005
Last Reviewed:	15 June 2009

Pub 812: Field Crop Protection Guide > Chapter 5: Dry Edible Beans > Seedcorn Maggot

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

Description
Integrated Pest Management Options
- Seed Treatment
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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.

thiamethoxam – Cruiser 5 FS
Active ingredient	thiamethoxam
Trade name	Cruiser 5 FS
Rate (product)	50-83 mL per 100 kg seed

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.

thiamethoxam + metalaxyl-M + fludioxonil - Cruiser Maxx Beans
Active ingredient	thiamethoxam + metalaxyl-M + fludioxonil
Trade name	Cruiser Maxx Beans
Rate (product)	195 mL per 100 kg seed

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.

diazinon + captan + thiophanate-methyl – DCT
Active ingredient	diazinon + captan + thiophanate-methyl
Trade name	DCT
Rate (product)	1 L of slurry

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.

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