WNY sweet corn trap network report 7.29.14

Twenty sites reporting this week. The second flight of European corn borer has started with nine sites reporting ECB-E and six sites reporting ECB-Z. Only three sites reporting corn earworm (CEW), but two of these were over threshold, indicating a need for a spray, please see the chart at the bottom of this page. Ten sites reporting Fall armyworm (FAW) catches with a high of 112 moths caught in Eden. Eleven sites reporting western bean cutworm (WBC) with Eden again having the highest count at 117.

WBC trap catches have increased over the last few weeks. According to data from the University of Nebraska, 50% of WBC emerge when the accumulated degree-days (base 50%) reach 1422 (see chart below). It is also recommended that scouting begins when cumulative trap catches reach 100 moths, however egg masses have been found when trap catches are in the single digits. The threshold for fresh market sweet corn is only 1%. It is important to scout late whorl and early tassel-emergence fields as these are most at risk. See last week’s post on how to scout sweet corn for WBC. After hatching larvae will spend a few days feeding on the tassel before moving down to the ear. Most insecticide sprays used to control ECB will also control WBC.

 

Percent WBC moth emergence, data from University of Nebraska

Percent WBC moth emergence based on degree day accumulation, data from University of Nebraska

 

Location ECB-E ECB-Z CEW FAW WBC Total WBC
to date
DD
to date
Avoca (Steuben Co.) 0 0 0 0 0 1 1318
Avon (Livingston Co.) 1 0 0 18 10 16 1517
Baldwinsville (Onondaga Co.) 3 0 0 0 9 20 1536
Batavia (Genesee Co.) 5 0 0 1 16 18 1190
Bellona (Yates Co.) 3 1 0 10 9 11 1578
Eden (Erie Co.) 0 0 0 112 117 213 1414
Farmington (Ontario Co.) 4 0 0 0 0 1 1444
Hamlin (Monroe Co.) 2 2 0 0 0 0 1421
Kennedy (Chautauqua Co.) 0 0 1 10 49 73 1209
King Ferry (Cayuga Co.) NA NA NA NA NA 1 1487
Kirkville (Madison Co.) NA NA NA NA NA 9 1601
LeRoy (Genesee Co.) 1 7 2 0 0 0 1315
Lockport (Niagra Co.) 2 1 0 0 0 0 1340
Oswego (Oswego Co.) 0 0 0 0 23 28 1405
Owego (Tioga Co.) 0 0 0 0 0 0 1352
Pavilion (Genesee Co.) 0 0 0 44 27 58 1315
Penn Yan (Yates Co.) 0 0 0 0 0 1 1535
Plessis (Jefferson Co.) 0 0 0 1 62 77 1331
Preble (Cortland Co.) 0 0 0 19 12 15 1478
Seneca Castle (Ontario Co.) 6 1 0 0 5 7 1456
Sherwood (Cayuga Co.) NA NA NA NA NA NA 1487
Spencerport (Monroe Co.) 0 2 7 0 0 0 1517
Waterport (Orleans Co.) NA NA NA NA NA 0 1421
Williamson (Wayne Co.) NA NA NA NA NA 11 1355
ECB – European Corn Borer
CEW – Corn Earworm
FAW – Fall Armyworm
WBC – Western Bean Cutworm
NA – not available
DD – Degree Day (modified base 50F) accumulation
trap catches for the week of 7.22.14 – 7.29.14

 

 

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