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Sweet Corn Pheromone Trap Network for Western New York, 2010

This is a seasonal scouting report giving growers in the Western New York area information on the presence of sweet corn pests and recommendations on scouting and thresholds. The report is written by Abby Seaman, NYS IPM's Area Extension Educator for Vegetables.

For 8/24/10

Corn earworm catches are extremely high this week at several locations, especially in central NY.  Catches ranged from 0-325 across the region, with the highest catches again to the east.  While the weather stays cooler a day can be added to the recommended spray interval in the chart below, but as the weather warms up later in the week intervals will need to be tightened as eggs will hatch more quickly.  ECB-E race moths are uniformly low.  Z race catches moths are being caught in the single digits at most locations, but Bellona again has a higher catch, 34 moths caught this week.  Fall armyworm catches are highly variable across the region, ranging from 0 to 52.  Western bean cutworm catches have dropped off, with all locations catching 0-1 moths.

Where corn earworm are being caught, insecticide applications in silk stage fields should be determined by CEW trap catches.  The recommended spray intervals for CEW should be adequate for ECB and FAW control.  Because CEW lay their eggs directly on the silk, and eggs are difficult to find in the field unless the population is VERY high, we rely on pheromone trap catches rather than scouting to make CEW management decisions.  It is most important to adhere to the recommended spray intervals when the field is in the green silk stage.  The chart below indicates recommended spray intervals during the silk stage for a range of trap catches:

Per Day
Per Five Days
Per Week
Days Between Sprays
<0.2
<1.0
<1.4
No Spray (for CEW)
0.2-0.5
1.0-2.5
1.4-3.5
6 days
0.5-1.0
2.5-5.0
3.5-7.0
5 days
1-13
5-65
7-91
4 days
over 13
over 65
over 91
3 days
Add one day to the recommended spray interval if daily maximum temperatures are less than 80 F for the previous 2-3 days.
 
Location
ECB-E
ECB-Z
CEW
FAW
WBC
Avoca (Steuben Co.)
0
0
55
NA
1
Avon (Livingston Co.)
0
0
60
NA
0
Baldwinsville (Onondaga Co.)
0
1
325
12
0
Batavia (Genesee Co.)
NA
NA
NA
NA
NA
Bellona (Yates Co.)
5
34
215
40
0
Eden Z (Erie Co.)
0
0
0
0
0
Farmington (Ontario Co.)
2
0
17
1
0
Great Valley (Cattaraugus Co.)
0
0
5
0
0
Hamlin (Monroe Co.)
0
2
43
2
0
Kennedy (Chautauqua Co.)
0
6
107
52
0
King Ferry (Cayuga Co.)
0
0
99
13
0
Kirkville (Madison Co.)
NA
NA
NA
NA
NA
LeRoy (Genesee Co.)
3
2
4
0
1
Lockport (Niagara Co.)
0
0
3
0
0
Medina (Orleans Co.)
NA
NA
NA
NA
NA
Owego (Tioga Co.)
0
1
29
NA
NA
Penn Yan (Yates Co.)
0
4
72
12
0
Pike (Wyoming Co.)
1
3
7
4
0
Plessis (Jefferson Co.)
NA
NA
NA
NA
NA
Preble (Cortland Co.)
0
0
100
0
NA
Sherwood (Cayuga Co.)
0
0
215
11
0
Spencerport (Monroe Co.)
0
0
3
2
0
Williamson (Wayne Co.)
NA
NA
NA
NA
NA