This week 17 of the 24 sites reported trap catch counts. Numbers for ECB-E remain very low with only Farmington and LeRoy reporting one ECB-E each. Hamlin, LeRoy, Owego, and Penn Yan  are all reporting ECB-Z. Still no FAW or WBC caught this season. CEW was once again caught at 4 locations. Three of the  CEW sites are the same as last week, Batavia, Eden, and Williamson, and one new site, Avoca.  Only Eden had CEW numbers high enough to indicate the need for a six day spray interval. Please refer to the table below for spray intervals based on weekly trap catches.

The first flight of ECB is tapering off. The second generation of ECB-E  will begin to emerge at about 1400 modified base 50 degree days. Pin holes form ECB have been seen in the whorl of some sweet corn. Scouting of bare ground sweet corn should begin when the tassel starts to emerge. When scouting focus on the emerging tassel. Separate the leaves and look down into the tassel for any signs of feeding, frass or larvae. The threshold for ECB and FAW is 15% infested plants at tassel emergence. The feeding damage differs between FAW and ECB, the FAW damage is more ragged than ECB (see photos below).

ECB frass in emerging tassel

ECB larva on tassel

 

 

 

 

 

 

 

 

 

FAW feeding damage.

 

 

 

 

 

 

 

 

 

Location ECB-E ECB-Z CEW FAW WBC
Avoca (Steuben Co.) 0 0 1 0 0
Avon (Livingston Co.) NA NA NA NA NA
Baldwinsville (Onondaga Co.) 0 0 0 0 NA
Batavia (Genesee Co.) 0 0 2 0 0
Bellona (Yates Co.) NA NA NA NA NA
Eden (Erie Co.) 0 0 3 0 0
Farmington (Ontario Co.) 1 0 0 0 0
Hamlin (Monroe Co.) 0 4 0 0 0
Interlaken (Seneca Co.) 0 0 0 0 0
Kennedy (Chautauqua Co.) 0 0 0 0 0
King Ferry (Cayuga Co.) NA NA NA NA NA
Kirkville (Madison Co.) 0 0 0 0 0
LeRoy (Genesee Co.) 1 3 0 0 0
Lockport (Niagra Co.) 0 0 0 0 0
Oswego (Oswego Co.) NA NA NA NA NA
Owego (Tioga Co.) 0 1 0 0 0
Penn Yan (Yates Co.) 0 1 0 0 NA
Pike (Wyoming Co.) NA NA NA NA NA
Plessis (Jefferson Co.) NA NA NA NA NA
Preble (Cortland Co.) 0 0 0 0 0
Sherwood (Cayuga Co.) NA NA NA NA NA
Spencerport (Monroe Co.) 0 0 0 0 0
Waterport (Orleans Co.) 0 0 0 0 0
Williamson (Wayne Co.) 0 0 2 0 0
ECB – European Corn Borer
CEW – Corn Earworm
FAW – Fall Armyworm
WBC – Western Bean Cutworm
NA – not available
trap catches for the week of 6.18.13 – 6.25.13