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Contans White Mold Press Release

April 13, 2010                                                                   

White Mold Devastation in Midwest Still Fresh in Growers’ Minds

2009 proves Even-number Year Theory Wrong

          Durham, NC:  Although historically documented to occur in even years in the Midwest, the white mold pressure of 2009 proved this theory wrong.  White mold caused by sclerotinia sclerotiorum devastated many farmers’ fields in 2009 – with some reporting losses of up 40 bushels per acre in soybeans. The pressure was wide spread with reports of white mold outbreaks from most of the soybean and edible bean production states.  The story doesn’t stop in 2009, with record levels of Sclerotinia being returned to the soil in advance of the 2010 planting season.

Since sclerotia (small black bodies seen at harvest) are known to overwinter and last in the soil for seven to ten years it is very important to manage White Mold similar to managing weed populations – with a proactive and ongoing program.  Regular management of sclerotinia populations will net big paybacks in terms of yield for growers.

According to Scott Peterson, Product Manager with SipcamAdvan, “One way to manage this harmful disease is by attacking it at the source with Contans WG.  Contans is soil applied early in the spring and attacks the sclerotia before they can release spores.”  University research has shown that an IPM approach for managing white mold is crucial in combating this yield robbing organism. 

The benefit of treating early in the spring is that Contans reduces the source of disease pressure (sclerotia) early in the season; before the disease infects the crop.  Even during a non-white mold year, Contans works in the soil to reduce the fungus population, similar to how annual applications of herbicides reduce the weed seed bed year after year.

Mild damp weather throughout the Midwest is again creating optimal conditions for the widespread development of white mold in soybeans, edible beans, canola and sunflowers.  Early management of white mold is key to protecting yields and applying Contans to the soil pre planting will effectively reduce the source of inoculum and the incidence of white mold later in the season. 

Contans Biofungicide is available from SipcamAdvan as part of their expanding portfolio to meet the needs of US growers.  “Offering effective, differentiated solutions to distributors is a key goal of SipcamAdvan, Contans is one of these products” said Vice President of Marketing Adam Burnhams.  “We have an exciting pipeline of both conventional and biorational solutions in development and look forward to our continued partnership with distribution.”

About SipcamAdvan

SipcamAdvan is owned by the Sipcam-Oxon Group, an Italian company recognized worldwide for its formulation and manufacturing expertise.  SipcamAdvan uses a distribution-focused marketing strategy to provide traditional chemical and biorational products to the agriculture, turf and ornamental, home and garden, and pest management markets in the U.S. and Mexico.  The company is headquartered in Durham, North Carolina.

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More on Soybean White Mold This Year

More on Soybean White Mold This Year

By XB Yang and S.S. Navi, Department of Plant Pathology

Soybean white mold has been a production problem for soybean producers since early 1990s. White mold outbreaks often occur in even years due to crop rotations, with rare severe occurrences in odd years. Iowa’s cool, wet summer has increased the white mold risk for some growers in eastern Iowa – even though it is an odd year.  Extension field agronomist Virgil Schmitt first reported the occurrence of white mold in east central Iowa and Jim Fawcett, northeast Iowa field agronomist, has received a report of severe white mold in a 60-acre field.

Although many Iowa soybean producers are experienced with this disease, there are questions when it shows up in mid-August. Some are asking if applying chemicals is a solution. Others want to know if an immediate application of a fungicide can stop the infestation of this disease.

The short answer is that it is too late to use any fungicides for white mold control.  It wastes resources if fungicides are applied now.  White mold fungus attacks soybean plants during flowering stage and treatments to protect soybean have to be made before or during the flowering period, depending on chemicals used. The dead plants visible now are the results of fungus infestation that happened before mid-July.

Management
If you have severe white mold in your soybean fields, consider no-tillage if corn is a rotation crop. Another consideration is to use Contan after soybean harvest. Contan is a biological control agent proven to be effective in white mold control in many crops.  A tolerant variety of soybean should be planted in this location during the next rotation or a consideration given to using Cobra, a herbicide that can reduce white mold infection if applied correctly. There are other chemicals in the same family that are effective in reducing the risk of this disease.

New_Image    mycelia

Soybean field showing wilt symptoms           Mycelia (a) and sclerotia (b) formation on
due to white mold.                                          
 white mold infested soybean  plant.   

XB Yang is a professor of plant pathology with research and extension responsibilities in soybean diseases. Yang can be reached at (515) 294-8826 or by emailing This e-mail address is being protected from spambots. You need JavaScript enabled to view it . SS Navi is an assistant scientist working on soybean diseases.  

 

 

 


This article was published originally on 8/15/2009 The information contained within the article may or may not be up to date depending on when you are accessing the information.


Links to this material are strongly encouraged. This article may be republished without further permission if it is published as written and includes credit to the author, Integrated Crop Management News and Iowa State University Extension. Prior permission from the author is required if this article is republished in any other manner.

 
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