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Soybeans: Frog-Eye Leaf Spot (Cercospora sojina)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 28 July 2007
Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Frog-Eye Leaf Spot

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

Economic impact is minimal. Frog-eye leaf spot occurs under hot, humid conditions particularly on very susceptible varieties. The disease is most frequent in the extreme southwest counties.

Foliar Treatment
pyraclostrobin – Headline EC
Active ingredient pyraclostrobin
Trade name Headline EC
Rate per hectare (product) 400-600 mL per ha
Rate per acre (product) 160-240 mL per ac

Comments
Ground and aerial application. Maximum of 2 applications per year. Make first application at the first sign of disease followed by the second application 14 days after if environmental conditions are favourable for disease development. 21 days to harvest interval. 48 hr re-entry period.

propiconazole – Bumper 418 EC
Active ingredient propiconazole
Trade name Bumper 418 EC
Rate per hectare (product) 300 - 455 mL per ha
Rate per acre (product) 121 - 184 mL per ac

Comments
For soybeans grown for seed only. Ground application only. Apply when disease first appears. Under severe disease pressure, make a second application 14 days after. 50 days to harvest interval. Soybean seed should not be used for human or animal consumption.

propiconazole – Tilt 250 E
Active ingredient propiconazole
Trade name Tilt 250 E
Rate per hectare (product) 500 - 760 mL per ha
Rate per acre (product) 200 - 308 mL per ac

Comments
For soybeans grown for seed only. Ground application only. Apply when disease first appears. Under severe disease pressure, make a second application 14 days after. 30 days to harvest interval. Soybean seed should not be used for human or animal consumption.

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