Soybeans: Mosaic Virus

Excerpt from Agronomy Guide for Field Crops (Chapter 4)

Order OMAFRA Publication 811: Agronomy Guide for Field Crops

Table of Contents

1. Incidence
2. Appearance
3. Disease Cycle
4. Management Strategies
5. Updates on Soybeans: Mosaic Virus
6. Related links...

Incidence

Low levels of this disease occur in most areas of the province. Food grade or specialty beans requiring blemish-free seed coats are at the highest risk of economic losses due to the soybean mosaic virus.

Appearance

Leaves of infected plants are distorted, wrinkled and puckered and have a typical mosaic pattern that is most evident on younger leaves. Infected plants may be stunted. Infected seeds have a characteristic brown or black discolouration extending in streaks from the hilum region. Virus symptoms are often confused with hormonal herbicide injury. Plants infected with soybean mosaic virus are scattered in the field, and generally the area affected is smaller than if the cause were herbicide injury. In addition, there is no pattern to the injury.

Plate 76. Soybean mosaic virus symptoms include distorted and puckered leaves. Plants may be stunted. Vectored by soybean aphids.

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Plate 77. Soybean mosaic virus can cause brown or black discolouration of the seed and streaks near the hilum.

Disease Cycle

The virus survives from season to season in infected seed and is transmitted from plant to plant by aphids.

Management Strategies

Planting disease-free seed controls the disease in Ontario.

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Updates on Soybeans: Mosaic Virus

No updates available at this time.

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Related links...

• Disease
• Soybeans
• Field Crop Protection Guide - Publication 812

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