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Navigation BulletAbout the Department
Navigation BulletField Seed Program
Navigation BulletPotato Program
Navigation BulletRegulatory Program
Navigation BulletDiagnostic Lab
Navigation Spacer- Seed Health Tests
Navigation Spacer- Barley Loose Smut
Navigation Spacer- Bean Anthracnose
Navigation Spacer- Bean Bacterial
Navigation SpacerBlight

Navigation Spacer- Blackleg
Navigation Spacer- Diaporthe/
Navigation SpacerPhomopsis

Navigation Spacer- Pulse Crop
Navigation SpacerAscochyta

Navigation Spacer- Soybean Bacterial
Navigation SpacerBlight

 Navigation Spacer- Genetic Tests
Navigation Spacer- Genetic Purity TestNavigation Spacer - Variety ID Testing
Navigation Spacer- Testing for
Navigation SpacerAdventitous
Navigation SpacerPresence

Navigation Spacer- Potato Tests
Navigation Spacer- Potato Virus
Navigation SpacerTesting
Navigation Spacer- Potato GMO
Navigation SpacerTesting

Navigation Spacer- Sample Sizes
Navigation SpacerRequired for Tests

Navigation Spacer- Fees
Navigation Spacer- Seed Testing Links
Navigation BulletSeed Lab
Navigation BulletFees
Navigation BulletDeadlines
Navigation BulletNews
Navigation BulletContacts

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An important group of seed-borne fungal diseases of soybean are collectively known as the Diaporthe/Phomopsis complex. This group of diseases includes Phomopsis Seed Decay, Pod and Stem Blight, and Stem Canker. All three diseases are caused by Phomopsis or Diaporthe species.

Phomopsis Seed Decay causes soybean seed to become cracked, shriveled, and white in appearance. Seed may be infected and not show any symptoms. Planting infected seed provides a source of the fungus for field infection. Soybean pods can become infected and later infect seed.

Pod and Stem Blight can be difficult to detect in the field as symptoms do not always develop on leaves or stems. The fungus can be found on dry stems and pods and is spread by plant residue as well as infected seed.

Stem Canker produces lesions on stems and leaves. This disease can cause seedlings to die in the field thus reducing overall stand. This disease is again spread by plant residue and infected seed.

These fungal diseases can be controlled by:
The Seed Department conducts an agar test for Diaporthe/Phomopsis using a minimum sample size of 500 seed. This test is typically completed in seven days and results are reported as a percentage of infected seed.


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