Although some parts of Illinois have started to get beans in the ground, most of us are still waiting for soils to dry out and warm up. Something that should be on our radars in the week or two before planting are soilborne insect pests that may affect our soybeans. Wireworms and white grubs are the two pests of importance in Illinois, and on occasion these insect larvae can cause significant reductions in stands and early season plant vigor.... Read More →
ILSOYADVISOR POST
WEBINAR: Insect Pest Management in Soybeans: What to Watch Out for in 2020
June 04, 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) checkoff and membership programs represent more than 43,000 soybean farmers in Illinois. The checkoff funds market development and utilization efforts while the membership program supports the government relations interests of Illinois soybean farmers at the local, state, and national level through the Illinois Soybean Growers (ISG). ISA upholds the interests of Illinois soybean producers through promotion, advocacy, and education with the vision of becoming a market leader in sustainable soybean production and profitability. For more information, visit the website www.ilsoy.org and www.ilsoygrowers.com.
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