WEBINAR: Insect Pest Management in Soybeans: What to Watch Out for in 2020

This webinar will focus on season-long insect pest management in soybeans. We will discuss biology, damage potential and management tactics for dectes stem borer, stink bugs and defoliating insects.

1 CEU in Integrated Pest Management

Presenter: Nick Seiter, Research Assistant Professor, Field Crop Entomology at the University of Illinois at Urbana-Champaign

Dr. Nick Seiter is a Research Assistant Professor of Field Crop Entomology at the University of Illinois. He develops management recommendations for insect pests of soybean and corn. He has a Ph.D. in entomology from Clemson University, and bachelor's and master's degrees in entomology from Purdue University.

  • Dectes Stem Borer
    • Dark brown frass lines tunnels of soybean stem
    • Larvae are cannibalistic and will eat other larvae
    • Indication of larvae – a pile of sawdust when dectes larvae girdle the main stem
    • Management:
      • Chemical control is not recommended at this time – would take multiple applications to get control
      • Prevent lodging with a timely harvest
      • Identify infested fields during late summer and as harvest approaches: wilted petioles, larval tunneling, sawdust piles
      • More likely to have infestations in no-till fields
  • Stink Bugs
    • Populations are typically highest in late R5/R6 in Illinois
    • Several species – green and brown
      • Brown stink bugs are more difficult to control with chemical
    • Brown Marmorated Stink Bug – invasive species increasing in population
      • Haven’t seen big issues in soybeans yet
      • Better at avoiding detection
    • Redbanded Stink Bug – major issue in the mid-southern US
      • More damaging than other species in soybeans
      • Mouth part is larger and can ingest more material
      • Stronger preference for soybeans and legumes
      • Has not been a major issue in Illinois yet
    • Management in Illinois
      • Most infestations occur late in season (R5-R6)
      • Preventative insecticide sprays are not effective because of short residual
      • Scout during R5-R6
      • Economic thresholds: Sweep-net nine stink bugs in 25 sweeps; drop cloth one stink bug per row-ft
  • Defoliators
    • Most defoliation we see in Illinois is cosmetic – soybeans tolerate a lot of defoliation, especially in vegetative stages – economic threshold is 30%
  • Armyworms and Stand Loss
    • Scout when soybeans follow a grass or in a field near wheat
    • Rye cover crop is also very attractive

Illinois Soybean Association
The Illinois Soybean Association (ISA) is a statewide organization that strives to enable Illinois soybean producers to be the most knowledgeable and profitable soybean producers around the world. ISA represents more than 43,000 soybean farmers in Illinois through two primary roles; the state soybean checkoff and legislative and regulatory advocacy efforts.



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