Plant Protection
Soybean Fungus Management
Phytophthora Seed & Seedling Blight

Phytophthora can attack and rot seeds prior to emergence, and can cause pre- and post -emergence damping off.
Phytophthora rot is a widespread disease.
At the primary leaf stage (V1), infected stems appear bruised and are soft, secondary roots are rotted, the leaves turn yellow, and plants frequently wilt and die.
A related pathogen, Pythium, causes similar symptoms and can only be differentiated by laboratory examination.

Pathogen Involved:
Phytophthora sojae is a fungal-like pathogen that survives in soil for up to 5-10 years in association with decomposed soybean tissues.
Soybean is the only known crop host for this pathogen.
This pathogen infects soybean at all stages of development, and is most active and causes most damage in wet soils.

Time of Occurrence:
All season.

Conditions Favoring Disease:
The disease often occurs after wet weather and in low, poorly drained areas, particularly on clay, compacted soils.

Disease Management:
Resistant varieties. Varieties with race-specific resistance should be used. Varieties that have high levels of tolerance to Phytophthora rot may reduce the seedling and adult phase of the disease.
Fungicidal seed treatments can also reduce damage to seed and young seedlings.
Soil drainage should be improved if possible, and low areas of fields should be avoided, especially if a field has a history of seedling or root rot problems.
Crop rotation may be of some benefit.

From: Field Crop Diseases.Information and Management for Illinois

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