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Dry Edible Beans: Fusarium Seed and Root Rot (Fusarium solani f. sp. phaseoli)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 28 July 2007
Pub 812: Field Crop Protection Guide > Chapter 6: Dry Edible Beans > Fusarium Seed and Root Rot

Excerpt from Chapter 6, Field Crop Protection Guide, Order this publication

Table of Contents

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

Integrated Pest Management Options

Fusarium begins as small, reddish-brown lesions on the taproot that join to form larger lesions, or streaks, as the plant ages. The lesion can extend up to the soil like. Splitting of the tap root, crown and lower stem often reveals a brown-reddish internal discoloration of the water-conducting tissue. Longitudinal cracks and adventitious roots may develop on damaged plants. These adventitious roots are formed above the damaged area. Late infection seldom results in dead plants but rather in stuned, unthrifty-looking ones. Disease development is promoted by soil compaction, short crop rotatins and moisture stress.
Seed Treatment

Due to anthracnose concerns, all seeds should be treated with DCT. See the section Anthracanose (Colletotrichum lindemuthianum), for more details.

diazinon + captan + thiophanate-methyl – DCT
Active ingredient diazinon + captan + thiophanate-methyl
Trade name DCT
Rate (product) 1 L of slurry per 100 kg seed

Comments
Due to anthracnose, all edible beans MUST be treated with DCT. Seedling blights and damping-off are also controled. Use full rate and ensure good coverage by applying as a slurry. Available in a 400-g container that will treat 77 kg of dry bean seed. To make slurry, use 520 g seed treatment/L of water. For control of Pythium and Phytophthora root rots, add metalaxyl.

carbathiin + thiram – Vitaflo 280
Active ingredient carbathiin
Trade name Vitaflo 280
Rate (product) 260 mL per 100 kg seed

Comments
Ensure good seed coverage.

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 of mist-type seed treatment equipment. Compatible with Rhizobium-based inoculants. Check with inoculant manufacturers prior to use. Ensure uniform coverage.

diazinon + captan – Agrox B-2
Active ingredient diazinon + captan
Trade name Agrox B-2
Rate (product) 320 mL per 100 kg seed

Comments
Available in a 2-kg container that will treat 625 kg of bean seed. Use full rate and ensure good coverage of seed. Seed within 1 month of treatment. Do not use on seed already treated with an insecticide.

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