Management of Soybean White Mold

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1996-11-20
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Yang, X. B.
Lundeen, Peter
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Proceedings of the Integrated Crop Management Conference
Iowa State University Conferences and Symposia

The Iowa State University Integrated Crop Management Conference is Iowa's premier crop production education event. No other program in Iowa brings together the diverse range of topics, slate of expert presenters and results of the latest University research.

The ICM Conference offers workshops focusing on the latest in crop production technology. Experts from Iowa and surrounding states will provide research updates and results in soil fertility, soil and water management, crop production and pest management.

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Abstract

In the 1996 field season, white mold was prevalent in many Iowa soybean fields at much greater levels than in 1992 and 1994. This outbreak may be attributed to the high moisture (rain and heavy dew) and cool temperature in August. Compared with 1994, the disease differences were 1) a greater number of severely infested fields with sizes ranging from 50 to 100 acres have been observed, and 2) the disease occurred further south. Although the disease was observed in counties as far south as hwy 34 in 1994, no severe damage was reported. This year severe infestation occurred in a number of soybean fields along hwy 34. Our data indicates that the disease is here to stay, and very likely to increase in the future if we do not manage it properly. Two strategies are proposed to manage the disease: prevent the introduction of the pathogen into noninfested soybean fields, and control the build-up of the pathogen in fields where the pathogen has been introduced.

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