Soybeans: Phytophthora Root Rot (Phytophthora sojae)


Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Phytophthora Root Rot

Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

  1. Integrated Pest Management Options
    • Seed Treatment
      • fludioxonil + metalaxyl-M – Apron Maxx RFA, Apron Maxx RFC
      • thiamethoxam + metalaxyl-M + fludioxonil - Cruiser Maxx Beans
      • metalaxyl-M - Apron XL-LS
      • metalaxyl Allegiance FL, Apron FL
  2. Related links...

 

Integrated Pest Management Options

Seed Treatment

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 and the Ontario Oil and Protein Seed Crop Committee Variety Trial Results at www.gosoy.ca for variety profiles. This disease is primarily controlled through resistant varieties. Crop losses are greatest in cold, wet, clay soils. Try to minimize soil compaction and remove excess moisture through improved drainage. A small amount of tillage will help warm the soil and improve surface drainage. Rotate soybeans with corn and wheat. Plant seen when soil temperatues are above 13°C.

 
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.

 

 
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 both commercial seed treatment plants and on-farm treatment. 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.

 

 
Active ingredient thiamethoxam + metalaxyl-M + fludioxonil
Trade name Cruiser Maxx Beans
Rate (product) 195 mL per 100 kg seed
Comments For use in commercial treatment facilities 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.

 

 
Active ingredient metalaxyl-M
Trade name Apron XL-LS
Rate (product) 40 mL per 100 kg seed
Comments For us in commercial seed treatment facilities only. 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.

 

 
Active ingredient metalaxyl
Trade name Allegiance FL
Rate (product) 46-93 mL per 100 kg seed
Comments Do not graze or feed livestock on seeded area for 4 weeks after planting.

 

 
Active ingredient metalaxyl
Trade name Apron FL
Rate (product) 46-93 mL per 100 kg seed
Comments Do not graze or feed livestock on seeded area for 4 weeks after planting.

 


Related links...

 


For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 11 May 2011