Soybean Board Sentinel Plot Program Report for July 11, 2018

Our soybean sentinel plots continue to have minor insect and disease populations, but walk your own fields to see what is active at your place.
Soybean Board Sentinel Plot Program Report for July 11, 2018 - News

Updated: July 11, 2018

Soybean Board Sentinel Plot Program Report for July 11, 2018

Japanese beetle in soybeans. Image Credit: Anna Busch

Summary of reports:

Reports this week from across Pennsylvania indicate mostly low pest populations in the soybean fields we are scouting. Most fields have minor pest populations of a suite of pest species. The most common pests this week are grasshoppers, Japanese beetles, green cloverworm, and silver-spotted skippers. Populations of these pests appear low now, but should be tracked locally by scouting fields regularly. For diseases, we have one report of soybean bacterial pustule and a few reports of Septoria brown and frogeye leaf spot.

This growing season, the Pennsylvania Soybean Promotion Board is funding a Soybean Sentinel Plot Program, which is being managed by The Dept. of Entomology at Penn State and executed by Penn State Extension. In this effort, Penn State Extension Educators are regularly scouting 25 or so ‘typical’ soybean fields in twenty counties across the state, reporting the populations of plant pathogens and insect pests that they find. Our goal is to inform folks which pests are active across the state, so that they will have a sense of what to expect when they scout their own fields as part of an IPM program. It would be inappropriate to use these reports to justify insecticide applications.

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. 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. Growers should be sure to check their own fields to determine your local populations, but these reports will indicate which pests are likely to be active in fields. Our reports are distributed via this weekly newsletter and are available via the Penn State Extension website.

10 July 2018 – Blair County – Zach Larson

Growth stage: R1

  • Japanese beetle – Severity: 1
  • Soybean brown spot – Severity 1

10 July 2018 – Schuylkill County – Dwane Miller

Growth stage: V3

  • Green cloverworm – Severity: 1
  • No diseases noted

9 July 2018 – Bedford County – Zach Larson

Growth stage: R3

  • Green cloverworm – Severity: 1
  • Japanese beetle – Severity: 1
  • Frogeye leaf spot – Severity: 1

9 July 2018 – Bucks County – Andrew Frankenfield

Growth stage: R2

  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Soybean bacterial pustule – Severity: 2

9 July 2018 – Butler County – Justin Brackenrich

Growth stage: R1

  • Bean leaf beetle – Severity: 1
  • Japanese beetle – Severity: 2
  • Lady beetles present
  • Soybean brown spot – Severity: 2

9 July 2018 – Cambria County – Zach Larson

Growth stage: R2

  • Japanese beetle – Severity: 1
  • Soybean brown spot – Severity: 1

9 July 2018 – Crawford County – Joel Hunter

Growth stage: V5

  • Grasshoppers – Severity: 1
  • Soybean aphids – Severity: 1
  • Soybean thrips – Severity: 1
  • Soybean brown spot – Severity: 1

9 July 2018 – Lancaster County – Jeff Graybill

Growth stage: R1

  • Grasshoppers – Severity: 1
  • Japanese beetles – Severity: 1
  • Frogeye leaf spot – Severity: 1

9 July 2018 – McKean County – Nicole Carutis

Growth stage: V4

  • No insect damage noted
  • No diseases noted

9 July 2018 – Mercer County – Claire Coombs

Growth stage: R1

  • Bean leaf beetle – Severity: 1
  • Brown marmorated stink bug – Severity: 0
  • Japanese beetle – Severity: 1
  • Potato leafhopper – Severity: 1
  • Soybean aphid – Severity: 1
  • Soybean brown spot – Severity: 1

9 July 2018 – Northumberland County – Anna Busch

Growth stage: R2

  • Grasshoppers – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • Green cloverworm – Severity: 1
  • Lady beetles present
  • No diseases noted

9 July 2018 – Potter County – Nicole Carutis

Growth stage: V7

  • Honey bees present
  • No insect damage noted
  • No diseases noted

9 July 2018 – Union County – Anna Busch

Growth Stage: V4

  • Japanese beetle – Severity: 1
  • No diseases noted

8 July 2018 – Potter County – Nicole Carutis

Growth stage: V3

  • No insect damage noted
  • No diseases noted

6 July 2018 – Perry County – Liz Bosak

Growth stage: R2

  • Japanese beetle – Severity: 1
  • Silver-spotted skipper – Severity: 1
  • No diseases noted

5 July 2018 – Lebanon County – Del Voight

Growth stage: R2

  • Grasshoppers – Severity: 1
  • Green cloverworm – Severity: 1
  • Japanese beetle – Severity: 3
  • Silver-spotted skipper caterpillar – Severity: 1
  • Unidentified defoliation varied in severity
  • Soybean brown spot – Severity: 2

5 July 2018 – Lebanon County – Del Voight

Growth stage: V4

  • Green cloverworm – Severity: 1
  • Japanese beetle – Severity: 1
  • Silver-spotted skipper caterpillar – Severity: 1
  • No diseases noted

3 July 2018 – Centre County – Adriana Murillo-Williams

Growth stage: V4

  • Japanese beetle – Severity: 2
  • Silver-spotted skipper caterpillar – Severity: 2
  • Two-spotted spider mite – Severity: 3
  • Soybean aphid – Severity: 5
  • Slugs – Severity: 2
  • Frogeye leaf spot – Severity: 1

Authors

Insect ecology Plant-insect interactions Conservation biological control Chemical ecology Gall insects

More by John Tooker, Ph.D. 

Entomology Integrated Pest Management Field and Forage Crops

More by Anna Busch