Corn Rootworm in 200809

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Corn Rootworm in 2008/09
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Corn Rootworm

• Variant as well as common were in very low
  numbers this past year.
• 6 fields throughout area were included this year
  (2008) in yellow sticky trap program

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Sticky Trap Program for 2008

• 12 traps per field
• Placed week of July 21
• Monitored and changed weekly
• Threshold is 5 beetles per trap per week
• None of the fields approached threshold

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6 Fields

• Adams County
• Just south of Quincy
• Brown County
• 2 miles east of Mt. Sterling
• Hancock County
• Burnside and extreme southeast Hancock
• Pike County
• Orr Center and Atlas bottoms

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Beetles Per Trap Per Day5.0 is Threshold

• Adams- .006
• Brown county- .0006
• Hancock (Burnside)- .04
• Hancock (SE corner)- .04 (only 3 weeks as
  fung/insect applied)
• Pike (Orr Center)- 0
• Pike (Atlas bottom)- .001

5 beetles per tray per day is the threshold, our
numbers were considerably lower than that
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Scouting for Beetles

• You can scout for beetles in the summer to
  determine the need for rootworm control the
  following year (not for variant)
• Scout for beetles from July thru August
• Count beetles in 50 plants scattered throughout
  field
• If, in any week, count exceeds .7 beetles per
  plant for C-C, or .5 beetles per plant for C-SB
  rotation, consider treatment to control