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Soybean Sentinel Plot Program

Posted: June 21, 2017

Soybean fields in our program continue to put on new growth and appear to be leaving slug damage behind. From the reports we have this week pest populations remain low, bean leaf beetles are active, but nothing concerning yet. Keep in mind that in their vegetative stages soybeans can tolerate up to 25% defoliation without dropping yield, so do not overreact if you find some feeding damage in your fields. For diseases, none have been reported this week. From last week, the field that may have had the beginnings of Septoria brown spot was a false alarm.

The Pennsylvania Soybean Promotion Board is funding a Soybean Sentinel Plot Program, which is being managed by Penn State Extension and The Dept. of Entomology at Penn State. In this effort, Penn State Extension Educators are regularly scouting 25 or so ‘typical’ soybean fields in nineteen counties across the state, reporting the populations of plant pathogens and insect pests that they find. Our goal is to keep folks aware of pests so that they will then scout their fields as part of an IPM program. It would be imprudent to use these reports as the basis or justification for an insecticide application or including insecticides in with a post emergence herbicide application.

In the reports below, pests that were found during scouting are listed with their severity, which is rated on a 1-10 scale with 10 being the highest. Growers should be sure to check their own fields to determine your local populations, but these reports will give you a sense of what pests are active in fields. Our reports are distributed via this weekly newsletter, Penn State’s Field Crop News, and will be available in the next day or two on Penn State’s Field Crop Entomology website.

Scouting Reports

19 June 2017 – Armstrong County – Rachel Milliron

Near Dayton

Growth stage: V2

  • Slugs – Severity: 1
  • Slug damage has significantly lessen in the last week
  • Bean leaf beetle – Severity: 1
  • No diseases noted

19 June 2017 – Elk County – Nicole Carutis & Mellissa Rathbun

Near Kersey

Field was disked, then soybeans were drilled in 7.5” rows after last year’s corn

Growth stage: VE

  • Slugs – Severity: 3
  • Potato leafhopper – Severity: 1
  • No diseases noted

19 June 2017 – Crawford County – Joel Hunter

Growth stage: V2

  • Slugs – Severity: 1
  • No diseases noted

19 June 2017 – Blair County – Zach Larson

Near Martinsburg

Growth stage: V1

  • Slugs – Severity: 1
  • No diseases noted (possible Septoria from last week was a false alarm)

19 June 2017 – Cambria County – Zach Larson

Near Loretto

Growth stage: V1

  • Slugs – Severity: 1
  • No diseases noted

19 June – Columbia County – Chris Houser/Joel Imgrund

Growth stage: V2

  • Bean leaf beetle – Severity: 1
  • No diseases noted

19 June – Northumberland County – Chris Houser/Joel Imgrund

Growth stage: V2

  • Bean leaf beetle – Severity: 1
  • Slugs – Severity: 2
  • Silver spotted skipper – Severity: 1
  • No diseases noted

19 June – Union County – Chris Houser/Joel Imgrund

Growth stage: V1

  • Bean leaf beetle – Severity: 2
  • Slugs – Severity: 2
  • No diseases noted

15 June – York County – John Rowehl

Near Stewartstown

Growth stage: V1-V2

  • Bean leaf beetle – Severity: 1
  • Mexican bean beetle – Severity: 1
  • No diseases noted

15 June – Clinton County – Don Woodring

Near Mill Hall

Growth stage: VC

  • Slugs – Severity: 1
  • No diseases noted

14 June – Clinton County – Don Woodring

Near Eastville

Growth stage: VC

  • Slugs – Severity: 1
  • No diseases noted

Contact Information

John Tooker
  • Extension Specialist
Phone: 814-865-7082