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Area of Science:

  • Plant Pathology
  • Entomology
  • Epidemiology

Background:

  • Bean pod mottle virus (BPMV) is a significant pathogen affecting soybean production.
  • The bean leaf beetle (Cerotoma trifurcata) is the primary vector for BPMV.
  • Understanding BPMV epidemiology is crucial for managing soybean crop losses.

Purpose of the Study:

  • To survey the prevalence of BPMV in Iowa.
  • To assess potential primary inoculum sources of BPMV.
  • To investigate the role of bean leaf beetle populations in BPMV transmission.

Main Methods:

  • Conducted statewide surveys for BPMV.
  • Monitored bean leaf beetle populations from 1989-2002.
  • Tested soybean seed, overwintered beetles, and alternate host plants for BPMV.

Main Results:

  • BPMV was detected throughout Iowa.
  • Bean leaf beetle populations reached a 14-year high in 2002.
  • Soybean seed, overwintered beetles, and Desmodium canadense were identified as BPMV sources.

Conclusions:

  • BPMV is endemic in Iowa, with multiple potential primary inoculum sources.
  • High vector abundance increases the risk of early-season BPMV infection.
  • Further epidemiological studies are warranted to understand BPMV spread.