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PestWatch Report on August 2, 2017

Posted: August 2, 2017

Although corn earworm dropped somewhat, counts are hovering above a 5-6 day threshold, and reaching a 4-5 day threshold in Erie.
Fall Armyworm feeding in vegetative corn. Photo: S. Fleischer, Penn State

Fall Armyworm feeding in vegetative corn. Photo: S. Fleischer, Penn State

European corn borer is in its 2nd generation, and fall armyworm immigration is occurring.

Corn earworm (CEW)

CEW is present throughout the state. Counts dropped since last week, but in Erie are exceeding 4-5 day spray intervals, and sites in Fayette, Lancaster, Lehigh and Westmoreland counties suggest 5-6 day spray intervals. It’s possible that the presence of silking field corn is helping dilute the moth counts.

European corn borer (ECB)

ECB is in its 2nd generation. Counts are high in Huntington county. York and Clinton counties had high counts last week.

Fall armyworm (FAW)

We continue to see low rates of trap capture, with an increasing number of sites, especially in Centre, Blair and Erie counties.

cew map 8-2-17

ecb map 8-2-17

faw map 8-2-17

spray count legend

Current Trap Counts

Average weekly catch - a 7-day moving average of the average catch/night.

COUNTY FARM/TRAP NAME CEW

ECB

FAW



18-Jul 25-Jul 1-Aug 18-Jul 25-Jul 1-Aug 18-Jul 25-Jul 1-Aug
Blair Curryville, PA
3 5 0 6 0 0 2 3 0
Blair Hollidaysburg, PA
0 5 0 0 11 0 0 0 0
Blair Tyrone, PA
3 35 6 0 7 0 2 5 6
Bradford Bristol's Produce 0 0 null 0 0 null


Bradford Larue's Produce 0 null null 7 null null


Bradford Shores Sisters Produce 0 0 null 0 0 null


Bucks Bedminster 0 0 0 0 0 0


Bucks Buckingham 0 null 7 11 null 23.5


Centre Harner 4 1.2 2 0 15.2 0 0 1.2 1
Centre Rock Springs 1.6 33.8 2.6 0 5.8 2 3 8.2 8
Centre Stormstown 11 15.2 2 0 1.2 0 0 7 16
Clinton Loganton 2.6 4.7 null 16.6 16.3 null


Erie Dudas Farm null 17 6


null 4 9
Erie Mason null 74 53


null 30 18
Fayette Duda's Farm Inc. 8 42 17 5 1 10 0 20 0
Huntingdon New Morning Farm null 5.3 14 null 78.8 49


Indiana Brush Valley 3 1 2 null 0 0 0 6 1
Indiana Creekside null 32 0


null 2 2
Lackawanna Ransom null null 0 null null 3


Lancaster Landisville 16 7 0 1 2 7 0 0 0
Lancaster Neffsville null 3 null null 3 null null 0 null
Lancaster New Danville 4 6 14 6 3 7 0 0 2
Lehigh Germansville 17 76 18 0 0 0 0 4 3
Luzerne Drums null 1 0 null 6 4


Luzerne Plains null 2 0 null 4 2


Lycoming Linden 0 1 0


3.1 2 1
Lycoming Montoursville 0 8 4


0 1 1
Lycoming Muncy 4.7 7 11


1.2 1 2
Montour Montour 1 1 null 3 7 null


Northampton Nazareth 0 2 null 0 0 null 0 0 null
Schuylkill Tower City 1 2 0 1 0 0 0 0 4
Washington Venetia 47 23 10





Westmoreland Schramms Farms and Orchard 21.5 null 18.7 0.9 null 3.7


York York 3 7 null 31 24 null 1 1 null

Thresholds

Reproductive (tassel/silk) and late vegetative corn attracts moths. Shorten spray schedules when populations increase.

Thresholds Based on CEW Captures

Levels CEW catch / week Spray frequency
almost absent 1–13 4 days to no spray
very low 14–35 5 to 6 day
low 36–70
4 to 5 day
moderate 71–349 3 to 4 day
high > 350 2 to 3 day

If CEW is low, then consider ECB

Levels ECB catch / week Spray frequency
almost absent < 14 no treatment
very low 15–35 6 day
low 38–70 5 day
moderate > 70 4 day
high

Contact Information

Shelby Fleischer
  • Professor of Entomology
Email:
Phone: 814-863-7788