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Bean pod mottle virus Spread in Insect-Feeding-Resistant Soybean
Margaret G Redinbaugh1, Julio E Molineros2, Jean Vacha2
1United States Department of Agriculture-Agricultural Research Service, Corn and Soybean Research, and Department of Plant Pathology, The Ohio State University-Ohio Agricultural Research and Development Center (OARDC), Wooster 44691.
Plant Disease
|February 14, 2019
Summary
Bean pod mottle virus (BPMV) spread in soybean was studied using resistant and susceptible genotypes. Insect-feeding resistance alone did not significantly reduce BPMV incidence, indicating complex disease dynamics.
Area of Science:
- Plant Pathology
- Agronomy
- Entomology
Background:
- Bean pod mottle virus (BPMV) significantly impacts soybean yield and seed quality.
- The bean leaf beetle (Cerotoma trifurcata) is a primary vector for BPMV transmission.
- Understanding BPMV spread dynamics is crucial for effective disease management in soybean production.
Purpose of the Study:
- To evaluate the impact of soybean genotypes with varying levels of resistance to bean leaf beetle feeding on BPMV incidence and spread.
- To test the hypothesis that reduced vector feeding on resistant soybean plants would decrease BPMV infection rates and movement within plots.
Main Methods:
- Field experiments were conducted across two locations in Ohio over two years.
- Five soybean genotypes, differing in insect-feeding susceptibility and growth habit, were evaluated.
- BPMV incidence was quantified using enzyme-linked immunosorbent assay (ELISA) at key growth stages.
- Bean leaf beetle feeding damage was visually assessed.
Main Results:
- BPMV incidence varied significantly among soybean genotypes, with highest rates in susceptible varieties (Resnik, Williams 82) and lower rates in some resistant (HC95-24) and susceptible semidwarf (Troll) types.
- Insect-feeding resistance alone did not consistently reduce BPMV incidence compared to susceptible genotypes.
- BPMV spread was influenced by year, location, inoculum level, and sampling date, generally increasing over time and with higher initial inoculum.
- Spatial aggregation of infected plants was observed but was independent of host genotype and inoculum level.
Conclusions:
- While soybean genotype influences BPMV infection levels, insect-feeding resistance alone is not sufficient to significantly reduce virus incidence and spread.
- Integrated pest and disease management strategies are likely necessary to control BPMV effectively in soybean.
- Further research into host-plant resistance mechanisms and vector-pathogen interactions is warranted.
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