Soybean Sentinel Plot Update

Posted: July 2, 2013

Insect and disease reports from soybean fields across the state.

As mentioned in previous newsletters, The Pennsylvania Soybean Promotion Board is funding a Sentinel Plot Program, which is being managed by Penn State Extension and the Deptartment of Entomology. In this effort, Penn State Extension Educators are regularly scouting eighteen ‘typical’ soybean fields in thirteen counties across the state, reporting the populations of plant pathogens and insect pests that they find.

Reports from the past week indicate that most fields are pretty wet. In these conditions, slugs are pretty happy, but once your plants are large enough, slugs should not be much of a concern. In general, insect and disease populations continue to remain low. Additional pest species are appearing in reports this week—soybean aphid, green cloverworm, Japanese beetle, and silver-spotted skipper caterpillars were mentioned in some reports, but all at really low levels. As expected, as the season progresses we are getting a few disease reports, mainly Septoria brown spot and bacterial leaf blight. 

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.

2 July – Montgomery County – Andrew Frankenfield
Growth stage: V3-V4

  • Grasshoppers – Severity: 1
  • Japanese beetles – Severity: 1
  • Slugs – Severity: 1
  • No visible diseases

2 July 2013 – Crawford County – Joel Hunter
Growth stage: V3-V5

  • Bean leaf beetle – Severity: 1
  • Bacterial leaf blight – Severity: 1
  • Septoria Brown Spot present – Severity: 1

1 July 2013 – Schuylkill County – Dwane Miller
Growth stage: V4

  • Bean leaf beetle – Severity: 1
  • Green cloverworm – Severity: 1
  • Silver spotted skipper – Severity: 1
  • Japanese beetles – Severity: 1
  • Lady beetles active
  • No diseases found

1 July 2013 – Lancaster County – Jeff Graybill
Growth stage: R1

  • Little insect pressure
  • Slugs – Severity: 1
  • Some Septoria brown spot on the lower leaves – Severity: 1

1 July 2013 – Mercer County – Gary Micsky
Growth stage: V11

  • Potato leafhopper – Severity: 1
  • Soybean aphid – Severity: 1
  • Slugs – Severity: 1
  • No diseases found

29 June 2013 – Franklin County – Jennifer Bratthauar
Growth stage: V4-V5

  • Bean leaf beetle – Severity: 1
  • Grasshoppers: present, but low populations
  • Green cloverworm: present, but low populations
  • Septoria brown spot present, but population is low

28 June 2013 – Armstrong County – Alicia Spangler
Growth stage: V6-V7

  • Bean leaf beetle – Severity: 1
  • Japanese beetle is present, but very few were found
  • Bacterial leaf blight – Severity: 1
  • Septoria Brown Spot present – Severity: 1

28 June 2013 – Lebanon County – Kaycee Browell/Del Voight
Three fields, ranging in growth stage from V6-R1

  • Bean leaf beetle active – Severity: Ranges from 1 to 4 depending on field
  • Grasshoppers – Severity: 1
  • No diseases found

26 June 2013 – Tioga County – Craig Williams
Growth stage: V2

  • No insects or diseases of significance found


Contact Information

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