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Soybeans: Phytophthora Root Rot (Phytophthora sojae)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 28 July 2007
Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Phytophthora Root Rot

Excerpt from Chapter 3, Field Crop Protection Guide, Order this publication

Table of Contents

  1. Integrated Pest Management Options
  2. Related links...

Integrated Pest Management Options

Select soybean varieties that have both specific resistance (Rps genes such as 1K and 1C) and good partial resistance (tolerance) to all races of Phytophthora. Consult with your seed company for variety profiles. Primarily controlled through resistant varieties. Losses are greatest in cold, wet, clay soils. Minimize soil compaction and remove excess moisture through increased drainage. A small amount of tillage will help warm soil and increase surface drainage. Rotate with corn and wheat. Plant when soil temperatues are above 13°C (55°F).

Seed Treatment

Treat seed with metalaxyl or metalaxyl-M (higher rate).

metalaxyl-M – Apron XL LS
Active ingredient metalaxyl-M
Trade name Apron XL LS
Rate (product) 40 mL per 100 kg seed

Comments
Do not use in hopper-box, planter-box, slurry-box, or other non-commercial seed treatment applications at or immediately before planting. Do not graze or feed livestock on seeded area for 4 weeks after planting. Read label for information regarding resistant strains of fungus.

metalaxyl – Allegiance FL, Apron FL
  Allegiance FL Apron FL
Active ingredient metalaxyl metalaxyl
Trade name Allegiance FL Apron FL
Rate (product) 46-93 mL per 100 kg seed 46-93 mL per 100 kg seed

Comments
Do not graze or feed livestock on seeded area for 4 weeks after planting.

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