Epidemiology of Soybean Pod and Stem Blight

Experiment I was conducted during 1978 and 1979 to investigate the development of pod and stem blight (PSB) of soybeans in the field as affected by soil fumigation, application of benomyl, and inoculations with Phomopsis sp. and its effect on agronomic traits: plant height, lodging, yields, and seed quality of soybeans. Two soybean cultivars, Beeson and Woodworth, were used. Only in 1978, Phomopsis sp. infection on stems and pods was significantly greater in the inoculated plots when compared with the check plots. Both stem and pod infection in plots protected with benomyl were significantly lower than those in check and inoculated plots. Plant height and lodging were not affected by inoculation. Inoculations did not affect yields, but the seed weight of Woodworth in 1979 was significantly reduced by inoculation over the check. However, results suggested that yields could be reduced by severe infection. Seed weight was negatively correlated with stem infection. In 1978, seed germination of Beeson was greatly reduced by inoculation over the check, but was increased by benomyl applications, which caused mainly by Phomopsis sp. control. The recovery of Phomopsis sp. and Diaporthe from seeds were significantly greater in the inoculated plots when compared to the check plots. In 1978, the plots protected with benomyl, showed a significant decrease in the recovery of Phomopsis sp. over the check plots.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Plant Pathology

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Sohn, Cheong Yeol

• Agriculture, Plant Pathology

Identifier

(UMI)AAI8324646

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70590