Soybeans: Frog-Eye Leaf Spot

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Soybeans: Frog-Eye Leaf Spot (Cercospora sojina)

Author:	OMAFRA Staff
Creation Date:	04 July 2005
Last Reviewed:	15 June 2009

Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Frog-Eye Leaf Spot

Excerpt from Chapter 2, Field Crop Protection Guide, Order this publication

Integrated Pest Management Options
- Foliar Treatment
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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 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.

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. Do not use soybean seed 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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