Soybeans: Seedcorn Maggot

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Soybeans: Seedcorn Maggot (Delia platura)

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

Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Seedcorn Maggot

Excerpt from Chapter 2, 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

Seed Treatment

Consider insecticide seed treatments in early planted fields where large amounts of manure, green manure, or residue have been recently incorporated or when cool backward emergence conditions are expected. Expect only 60%-70% control with seed treatments applied on-farm.

diazinon + captan – Agrox B-2
Active ingredient	diazinon + captan
Trade name	Agrox B-2
Rate (product)	340 g per 100 kg seed

Comments
Available as 2 kg container that will treat 625 kg of soybean seed. Do not use on seed already treated with an insecticide. Seed within 1 month of treatment.

diazinon + captan – Agrox CD
Active ingredient	diazinon + captan
Trade name	Agrox CD
Rate (product)	200 g per 100 kg seed

Comments
Available as a 600-g container that will treat 300kg of soybean seed. Use this product only on seed previously treated with captan or thiram.

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 insect populations are expected to be high. 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.

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