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Soybeans: Phytophthora Root Rot (Phytophthora sojae)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 15 June 2009
Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Phytophthora Root Rot

Excerpt from Chapter 2, 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-M (higher rate).

fludioxonil + metalaxyl-M – Apron Maxx RTA
Active ingredient fludioxonil + metalaxyl-M
Trade name Apron Maxx RTA
Rate (product) 325 mL per 100 kg seed

Comments
For both commercial seed treatment plants and on-farm treatment using standard gravity- or mist-type seed treatment equipment. Provides early-season protection for tolerant varieties. If target fields have a history of high Phytophthora pressure, or if susceptible varieties are to be treated, tank-mix with 31 mL per 100 kg seed of Apron XL LS. Compatible with Rhizobium-based inoculants. Check with inoculant manufacturers prior to use. Ensure uniform coverage.

fludioxonil + metalaxyl-M – Apron Maxx RFC
Active ingredient fludioxonil + metalaxyl-M
Trade name Apron Maxx RFC
Rate (product) 100 mL plus 230 mL of water per 100 kg seed

Comments
For commercial and on-farm application. 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. Provides early-season protection against phytophthora root rot for tolerant varieties of soybeans. If target fields have a history of high pressure or if susceptible varieties are to be treated, tank-mix with 31 mL of Apron XL LS per 100 kg seed.

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. Provides early-season protection against phytophthora root rot for tolerant varieties of soybeans. If target fields have a history of high pressure or if susceptible varieties are to be treated, tank-mix with 31 mL of Apron XL LS per 100 kg of seed.

metalaxyl-M - Apron XL-LS
Active ingredient metalaxyl-M
Trade name Apron XL-LS
Rate (product) 40 mLper 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.

 

Related links...

 

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