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Forage: Phytophthora Root Rot (Phytophthora medicaginis)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 28 July 2007
Pub 812: Field Crop Protection Guide > Chapter 4 : Forages > Phytophthora Root Rot

Excerpt from Chapter 4, Field Crop Protection Guide, Order this publication

Table of Contents

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

Integrated Pest Management Options

Plant resistant varieties that are treated with metalaxyl or metalaxyl-M. Drain excess moisture and avoid compaction. Avoid stresses such as insects, weeds and untimely cuttings that may stress the plants and make them more susceptible to Phytophthora. Do not cut during wet conditions. Crop rotation has little affect on the disease. Promote lateral root growth with good fertility program.

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

Comments
For alfalfa, clover, and forage grasses. 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) 46-110 mL per 100 kg seed 46-110 mL per 100 kg seed

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

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