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Soybean Sentinel Plot Program

Posted: September 14, 2016

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.

Current report: Most fields have reached growth stage R6 and some are experiencing leaf drop, so insects should not be a concern. Nevertheless, our reports indicate that insect and disease populations remain mild. Grasshoppers are the primary defoliators, but most populations remain well below the economic threshold (15-20% defoliation). For fields with earlier stages of plants and stronger populations of defoliators or disease, the size of the beans and potential damage caused by driving over them need to be balanced with anticipated gains from any late-season pesticide applications. We expect these results to represent the majority of soybean fields in PA, but scout your fields to find out for yourself.

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.

Reports

12 September – Schuylkill County

Dwane Miller

Growth Stage: R6-7

  • Grasshoppers – Severity: 2
  • Japanese Beetle – Severity: 1
  • Brown Leaf Spot – Severity: 1

12 September – Mercer County

Gary W. Micsky

Growth stage: R8

  • 90% of leaves have dropped
  • Slight White Mold in low lying spots
  • No insects noticed

12 September - Crawford County

Joel Hunter

Growth stage: R6

  • Japanese Beetle – Severity: 1
  • Bean Leaf Beetle – Severity: 1
    (All insects are at very slight levels with defoliation well below 1%)
  • Brown Spot – Severity: 1
  • Bacterial Pustule – Severity: 1

29 August - Erie County

Joel Hunter

Growth stage: R6

  • Japanese Beetle – Severity: 1
  • Bean Leaf Beetle – Severity: 1
    (All insects are at very slight levels with defoliation well below 1%)
  • White mold – Severity: 2
  • Slight Brown Spot – Severity: 1

12 September – York County

John Rowehl

Growth stage: R6

  • No insect pests observed
  • Stem canker – Severity: 1
  • Bacterial blight – Severity: 3

7 September – Clinton County

Don Woodring

Near Mill Hall

Growth Stage: R6-7

  • Bean leaf beetles – Severity: 2
  • Grasshoppers – Severity: 3
  • Green cloverworm – Severity: 2
  • Spotted Cucumber Beetle present
  • Brown Stinkbugs present
  • Aphids – Present at low levels
  • Lady Beetles – Present at low levels
  • Frog Eye Leaf Spot – Severity: 2
  • Brown spot – Severity: 1
  • Bacterial Blight, present at low levels

Near Loganton

Growth Stage: R6

  • Bean leaf beetles – Severity: 1
  • Grasshoppers – Severity: 1
  • Green cloverworm – Severity: 2
  • Brown Stinkbugs – Severity: 2
  • Cercospora – Severity: 1

6 September – Mercer County

Gary W. Micsky

Growth stage: R7

  • Grasshopper – Severity: 1
  • Slight White Mold in low lying spots
  • 3 isolated spots showing slight bacterial blight and brown stem rot

6 September - Bradford County

Mark Madden / Mason Tate

Near Ulster, PA

Growth Stage: R6

  • Japanese beetles – Severity: 2
  • Japanese Beetle – Severity: 2
  • Grasshoppers – Severity: 3
  • No diseases noted

5 September - Potter County

Heather Supplee / Nicole Carutis

*Disked, Planted, 15 inch Rows, 2nd Year Beans

Growth Stage: R6

  • Japanese Beetle – Severity: 1
  • Green Stink Bug – Severity: 1
  • Grasshoppers – Severity: 1
  • Phyllosticta Leaf Spot – Severity: 1
  • Bacterial Leaf Wilt – Severity: 1

5 September - McKean County

Heather Supplee / Nicole Carutis

*Disked, Planted, 15 inch Rows, 2nd Year Beans

Growth Stage: R6

  • Japanese beetle – Severity: 1
  • Soybean aphid – Severity: 1
  • Frog Eye Leaf Spot – Severity: 1
  • Bacterial Leaf Blight – Severity: 1
  • Cercospora Leaf Spot – Severity: 1

5 September - Elk County

Heather Supplee / Nicole Carutis

*No-Till, Drilled

Growth Stage: R5

  • Japanese Beetle – Severity: 1
  • Soybean aphids – Severity: 1
  • Grasshopper – Severity: 1
  • Bean Leaf Beetle – Severity: 1
  • Soybean Thrips – Severity: 1
  • Brown stink bug – Severity: 1
  • Frogeye Leaf Spot – Severity: 1
  • Sunscald present
  • Lots of spiders

Contact Information

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