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Bean leaf beetle on soybean leaf Winston Beck, Iowa State University, Bugwood.org
BEETLE IS BACK: The first of many checks of statewide soybean fields in Pennsylvania has found the bean leaf beetle in low numbers in many parts of the state.

Delayed plantings limit soybean scouting reports

30 fields across Pennsylvania are being scouted this summer for diseases and insects.

Penn State Extension educators are regularly scouting 30 or so “typical” soybean fields in 23 counties across the state, reporting the populations of plant pathogens and insect pests they find.

The goal is to inform the agricultural community of what pests are active across the state and to give farmers a sense of what to expect when they scout their own fields as part of an IPM program.

The Soybean Sentinel Plot Program is being funded by the Pennsylvania Soybean Promotion Board and managed by Penn State’s Department of Entomology.

Scouting reports

With planting delayed in many parts of the state, reports have been limited.

Regardless, the reports indicate low pest populations in soybean fields being scouted.

Right now, fields range from VC to V4 stage, reflecting the challenges growers are having getting the crop in the ground. The bean leaf beetle and slugs are the main pests that are active, but pest populations are small. Diseases have yet to develop.

Pests that were found during scouting are listed below with their severity, rated on a 1-10 scale with 10 being the highest and 1 being lowest. A severity score of 1 equates to 10% or less infestation or defoliation, a 2 aligns with 20% or less infestation or defoliation, and so on:

June 11

Lancaster County, Jeff Graybill:

  • Growth stage: V4
  • Bean leaf beetle: severity, 1
  • No other insects of note
  • No diseases noted

Bradford County, Casey Guindon:

  • Growth stage: VC
  • Slugs: severity, 1
  • No insects of note
  • No diseases noted

Mercer County, Claire Coombs:

  • Growth stage: V2
  • Bean leaf beetle: severity, 1
  • No diseases noted

Crawford County, Joel Hunter:

  • Growth stage: VC
  • No insects or slugs noted
  • No diseases noted

June 10

Franklin County, Brittany Clark:

  • Growth stage: V3
  • Bean leaf beetle: severity, 1
  • Slugs: severity, 1
  • No diseases noted

York County, Heidi Reed:

  • Growth stage: V2
  • Bean leaf beetle: severity, 1
  • Slugs: severity, 1
  • No diseases noted

June 4

Butler County, Justin Brackenrich:

  • Growth stage: V1
  • Bean leaf beetle: severity, 1
  • No diseases noted

June 3

Beaver County, Justin Brackenrich:

  • Growth stage: VC
  • Bean leaf beetle: severity, 1
  • Lady beetles present
  • No diseases noted
  • Slugs: severity, 1
Source: Penn State Extension, which is solely responsible for the information provided and is wholly owned by the source. Informa Business Media and all its subsidiaries are not responsible for any of the content contained in this information asset.
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