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Asian Soybean Rust

Encyclopedia Article

Photograph of soybean rustSoybean rust is a destructive foliar disease of soybean caused by the fungus Phakopsora pachyrhizi. Asian soybean rust is an aggressive disease that destroys photosynthetic tissue, causing premature defoliation, early maturation, and lower yields. It was first found in the continental United States in November 2004.

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Evaluating spray equipment for improved fungicide application

Encyclopedia Article

Fungicides are the only management tool presently available to manage Asian soybean rust. The fungicides currently registered for use on soybean (Section 3 and Section 18 labels) have little systemic movement, if any, within a leaf, especially when compared with systemic herbicides. Thus, fungicide efficacy depends on application timing, dosage, and perhaps most important, coverage and penetration. Droplet size, volume, and pressure influence coverage and penetration of the fungicide in the soybean canopy.

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