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Syngenta Field Report

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The Syngenta Field Report features information and experts from Syngenta sharing observations about issues growers are dealing with in the fields.

Frogeye Leaf Spot – Don’t let it jump in your field!

Jun 23, 2010
No one enjoys getting the flu. You feel awful and aren’t as productive as you would be when you’re healthy. The same goes for soybeans. When they are sick (a.k.a. disease present in the field) the plants are not as productive as if the disease weren’t present, resulting in lower yields and performance.

As we know, it is important to prevent diseases so the health and performance of soybean plants are not jeopardized. It is essential to scout fields, especially in these upcoming months, to detect symptoms of diseases, such as frogeye leaf spot, before the disease takes hold and devastates yields.

Diseases in plants, much like in humans, can be hard to identify. According to Dr. XB Yang, extension plant pathologist in the Department of Plant Pathology at Iowa State University, frogeye leaf spot is a fungal disease with spots that resemble a frog’s eye. The spot has a gray center with a distinct reddish-brown margin. Dr. Yang also explains that this disease infects younger leaves, so it first appears in the upper canopy in mid- to late season, and is also more common in river-bottom fields.

Plant pathologists from Purdue University say that the number of lesions on the plant with frogeye leaf spot will continue to increase if the weather is favorable for infection. With more lesions present, there is less green leaf area leading to reductions in yield. If favorable conditions for infection persist late in the season, the fungus will infect pods and seeds which can result in significant yield losses.

It is also important to choose a fungicide, such as a strobilurin, with the broadest spectrum of disease control to protect soybeans from infection. Diseases like frogeye leaf spot can nibble away at plant yields, making it vital to incorporate a fungicide. And much like a preventive vaccination is the best defense for the flu, a preventive fungicide application can be the best defense for your soybean plant, keeping it at optimum performance.

Good luck this summer on keeping your beans healthy and productive!

What diseases have been problems in your area?
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