Project Number: 6402-21220-010-16
Project Type: Specific Cooperative Agreement

Start Date: Jun 01, 2011
End Date: May 31, 2016

Objective:
The objective to evaluate the resistance of public and private soybean varieties and breeding lines to the most serious diseases present in the southern United States.

Approach:
The Delta Research and Extension Center, Mississippi Agricultural and Forestry Experiment Station, Stoneville, Mississippi, will obtain seed of the entries in the Mississippi State Soybean Variety Trials, which average 225 entries in soybean Maturity Groups III-VII. Seed of the breeding lines from the USDA soybean breeder at Stoneville will also be obtained. These entries and breeding lines will be screened for resistance to the following diseases: 1. STEM CANKER - The toothpick method of inoculation will be used to evaluate resistance to this disease. 2. FROGEYE LEAF SPOT - Spores from selected races which are prevalent in Mississippi will be sprayed on soybeans to be evaluated in mist chambers and in field studies. 3. CERCOSPORA BLIGHT, PURPLE LEAF STAIN AND POD ROT - The leaves of the entries will be inoculated with spores in mist chamber and field studies. Mature green pods will be placed in humidity chambers and inoculated with spores of the fungus. 4. BLACK ROOT ROT - Seed of the entries will be planted in potting mix infested with the fungus. Root ratings will be made 6 weeks after planting. Other foliar diseases of soybean will be evaluated if present in field plots.