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Soybean Sentinel Plot Program Update for July 12th, 2016

Posted: July 13, 2016

Insect and disease pressure remain low across most soybean fields in Pennsylvania. Grasshopper and Japanese beetle feeding damage being the two most prevalent insect pests found, with a low level of Soybean Aphids detected in a few fields. Little to no diseases of consequence were observed.

Current report: Our reports continue to indicate very mild insect pressure. Grasshoppers and Japanese beetles are the main pests that our scouts encountered in the last week. A few extension educators noted soybean aphids, so be sure to check your fields for these small insects; their populations start on young leaves and then on undersides of older leaves. Still very little disease has been reported. 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.

12 July – Columbia County

Chris Houser/Joel Imgrund

Growth stage: R1

  • Grasshoppers – Severity: 2
  • Japanese beetles – Severity: 1
  • Bean pod mottle virus – Severity: 2

12 July – Northumberland County

Chris Houser/Joel Imgrund

Growth stage: R1

  • Grasshoppers – Severity: 1
  • Japanese beetles – Severity: 2
  • No diseases noted

12 July – Union County

Chris Houser/Joel Imgrund

Growth stage: V6

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

11 July – Schuylkill County

Dwane Miller

Growth stage: V6-R1

  • Japanese beetle – Severity: 1
  • Green cloverworm present, but limited feeding
  • Septoria Brown Spot present but very limited

11 July – Franklin County

Kelly Patches

Near Greencastle
Growth Stage: V4-R1

  • Japanese beetles – Severity: 3
  • Soybean aphids – Severity: 1
  • Bean leaf beetles – Severity: 1
  • Green cloverworm – Severity: 1
  • Grasshoppers – Severity: 1
  • Brown marmorated stink bugs – Severity: 1
  • Potato leafhopper – Severity: 1
  • Velvet bean caterpillar – Severity: 1
  • Honey bees, lady beetles, spiders present

11 July – Potter County

Nicole Carutis/Heather Supplee

No-till, planted 30-in rows
Growth Stage: V4

  • Slugs – Severity: 1
  • Thrips – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Septoria leaf spot present
  • No diseases

11 July – McKean County

Nicole Carutis/Heather Supplee

Disked, Planted, 15 inch rows, 2nd year beans
Growth Stage: V4

  • Grasshopper nymphs – Severity: 1
  • Green cloverworm – Severity: 1
  • Mexican bean beetle – Severity: 1
  • Bacterial Leaf Wilt – Severity: 1
  • Septoria Leaf Spot – Severity: 1
  • Frogeye Leaf Spot – Severity: 1

11 July – Lebanon County

Del Voight / Emily Heilinger

Ten fields, some with soybeans grown from insecticide-treated seeds, some from untreated seeds
Growth stage: R1-R2
Treated and untreated fields have similar levels of insect damage

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

11 July – Bradford County

Mark Madden / Mason Tate

Near Ulster
Growth stage: R1

  • Weed presence is minimal to none
  • No sign of any insect damage
  • No sign of any foliar diseases
  • We received some rain showers over the weekend and this has greatly benefited

11 July – Mercer County

Gary Micsky

Growth stage: R2-3

  • Japanese beetle – Severity: 1
  • Soybean aphids – Severity: 1 (small nymphs visible with hand lens)
  • Potato leafhopper – Severity: 1
  • Lady beetles and honey bees present
  • No diseases noted

7 July – Clinton County

Don Woodring

Two fields
Growth stage: One field at V4, the other at V6

  • Slugs – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Japanese beetle – Severity: 1
  • Green cloverworm – Severity: 1
  • A few brown stink bug present
  • No diseases noted

7 June – York County

John Rowehl

Growth stage: R1

  • Mexican been beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • No diseases noted

Contact Information

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