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Sweet Corn Pheromone Trap Network

for Western NY - 2007

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 9/18/07

European corn borer counts are low at all locations this week.  Corn earworm numbers have dropped at many locations, with only one location (Eden) still in the hundreds.  Earworm larvae are very easy to find in fields that have not been treated.  As fields are harvested and only a few remain, pressure will increase in fields with drying silks, which would have been less attractive when younger fields were still available. Fall armyworm counts are still high at many locations, but should be taken care of by the recommended corn earworm spray intervals.

Once CEW are being caught in higher numbers, 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:

Average CEW Pheromone 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

Adams (Jefferson Co.)

0

0

32

0

Baldwinsville (Onondaga Co.)

0

0

24

NA

Batavia (Genesee Co.)

2

1

42

NA

Bellona (Yates Co.)

1

0

32

2

East Otto (Cattaraugus Co.)

NA

NA

NA

NA

Eden Z (Erie Co.)

NA

NA

117

44

Farmington (Ontario Co.)

0

0

31

36

Hamlin (Monroe Co.)

0

2

65

14

Kennedy (Chautauqua Co.)

0

1

21

14

King Ferry (Cayuga Co.)

NA

NA

NA

NA

Kirkville (Madison Co.)

NA

NA

NA

NA

LeRoy (Genesee Co.)

0

1

5

51

Lockport (Niagara Co.)

0

2

57

41

Medina (Orleans Co.)

0

1

1

13

Owego (Tioga Co.)

0

0

1

NA

Penn Yan (Yates Co.)

0

0

11

0

Spencerport (Monroe Co.)

0

0

58

32

Wayland (Steuben Co.)

NA

NA

NA

NA

Williamson (Wayne Co.)

0

0

72

12