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Rhizoctonia in Michigan soybeans lead to loss of yield potential


Michigan, USA
August 25, 2014

Rhizoctonia in soybeans

Rhizoctonia root rot is caused by the soilborne fungus Rhizoctonia solani and survives in most soils as sclerotia – also known as very resistant fungal survival structures. Yield losses of up to 48 percent have been reported in soybeans in the U.S., with some cases exceeding this statistic.

The best management practice to prevent lost yield potential is to apply a seed treatment containing a strobilurin fungicide. The two fields in the photo above demonstrate the strong visual difference when using a seed treatment vs. non-treatment. The healthy field (left) was treated prior to planting with a fungicide/insecticide program, whereas the poor-looking field (right) was not treated with any fungicide or insecticides.

The common symptoms of Rhizoctonia are yellowing or wilting leaves and plants, along with a brown to reddish lesion on the stem and roots just below the soil line. Certain stresses favor the disease’s development, including herbicide injury, soil insect damage, hail and soybean cyst nematode feeding. It’s important to be aware of the conditions that favor the development of Rhizoctonia root rot and consider the different ways to manage it in soybean production systems.

All photos are the property of Syngenta unless otherwise noted.

Reporting from Vermontville, MI



More news from:
    . Syngenta USA
    . Syngenta Seeds Inc. (USA)
    . Syngenta Crop Protection, Inc. (USA)


Website: http://www.syngenta-us.com

Published: August 26, 2014

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