Biology of Soybean Anthracnose Fungi and Their Interaction With Other Soybean Fungi (Colletotrichum, Synanamorph, Biocontrol)

Bright-field microscopy and scanning electron microscopy studies revealed that conidia of Colletotrichum truncatum and Glomerella glycines germinated terminally and subterminally with germ tubes that developed appressoria. Germ tubes were longer when on the midribs than in leaf laminae of soybean (Glycine max). Infection pegs were developed from appressoria that penetrated the epidemal cells. Discrete veinal necrosis of inoculated leaves was evident only with C. truncatum causing foliar anthracnose. Anthracnose severity was increased with increased incubation period in a mist chamber causing death of V-1 soybeans in 72 hr. Plants at V-2 to R-4 stages were all defoliated and showed stem-tip blights, but were not killed. Plants under shade showed more disease than under nonshade conditions. None of 413 soybean germplasm were immune to the disease when evaluated at V-1 stage in the mist chamber. Eighteen out of 182 field-inoculated soybean germplasm with C. truncatum gave 2% or more seeds with Colletotrichum.

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

• Manandhar, Juju Bhai

• Agriculture, Plant Pathology

Identifier

(UMI)AAI8623363

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70605