Skip to main content
ARS Home » Research » Publications at this Location » Publication #62906
Title: GRAY AND ACHENBACH PLANT DISEASE

Author
item Gray, Lynn
item ACHENBACH, LAURIE - SOUTHERN ILLINOIS UNIV

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/31/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary: Soybean sudden death syndrome is a relatively new soybean disease. This disease is caused by a fungal pathogen called Fusarium solani. There is little information about how much damage different individuals (called isolates) of this fungal pathogen cause on soybean plants. The present work was undertaken to determine how much damage nine different isolates of the fungus cause to soybean roots. Different soybean plants were grown in a growth chamber in soil containing different isolates of the fungus. At the end of the experiment, the root weight and the amount of root damage on each soybean plant were determined. The results from this work showed that most of the fungal isolates damaged the soybean root system severely and caused the leaves on infected soybean plants to turn yellow. Several isolates of the fungus did not severely damage the soybean root system and did not cause the plant leaves to turn yellow. The results from the present work provide new information about the SDS fungal pathogen on how it damages the soybean root system. This information is important to soybean plant pathologists and production agronomists that are working with this disease.

Technical Abstract: Spencer and Ripley soybean plants were grown in containers infested with different rates of soil inoculum of a SDS isolate of Fusarium solani. Soil inoculum rate significantly affected severity of root rot, percentage leaflets of inoculated plants with SDS symptoms, and percentage root weight. Leaf symptoms of SDS on Ripley were significantly less than on Spencer. When SDS isolate Cora-7 was used, only the soil inoculum rate wa significant for effect on percent root weight, leaflets with SDS symptoms and root rot severity. Nine SDS fungal isolates differed in the amount of root rot and severity of leaf symptoms that thay produced on inoculated Spencer and Ripley plants. Soybean Plant Introduction (PI) 520.733 did not develop SDS leaf symptoms when grown in soil infested with SDS isolate Cora-7, whereas symptoms occured on Spencer and Ripley plants.