Blog Post

Strobilurin-Resistant Frogeye Leaf Spot Threatens Late-Planted Soybeans

An agronomic image showing a soybean leaf infected with frogeye leaf spot.

With heavy spring rains, many growers had no choice but to plant their soybeans late this season.

The Ohio State University research shows later planted soybeans have a higher chance of being infected earlier in the season with frogeye leaf spot (FELS) and could experience yield losses of 5 bushels per acre (bu/A) if infected before the R3 growth stage.

Late planted soybeans have an increased risk of damage from FELS, and especially strobilurin-resistant FELS – a disease that has been confirmed in recent years in 11 different states across the South and Midwest.

Strobilurin-resistant FELS is often difficult to control. Syngenta advises growers to treat for strobilurin-resistant FELS proactively with multiple modes of action, particularly in fields that have had confirmations of this disease in the past.

Syngenta offers Quadris Top® SBX fungicide, which contains difenoconazole for preventive and curative disease control and azoxystrobin for crop enhancement benefits, promoting root strength and pod fill.

To learn more about strobilurin-resistant FELS, view this recent news release from Syngenta.

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