Transcript /abhps/downloads/9277.ppt

2007 Yellow Sticky Trap
Results
University of Illinois ExtensionAdams/Brown Unit
Bayer Crop Sciences
Need For Root Protection From
Corn Rootworms?
• Corn-corn rotation- recommendation is to utilize
some kind of treatment to reduce rootworm
larvae feeding (unless scouting previous
summer found beetle numbers below threshold)
• Corn-soybean rotation- variant is spreading west
ward in IL and can be found in our area at
various levels
• Corn rootworm beetle numbers were very low in
most areas of extreme western IL (with some
exceptions, rootworm beetle numbers were
almost non existent across the area in rotated
and continuous corn )
Should You Protect Your Corn in a
Corn-Soybean Rotation?
• Have observed corn rootworm beetles
over past 6 years in area soybean fields
• Eastern and northern portions of the
region have had the highest beetle counts
2007 Yellow Sticky Traps
• Adams- B. Breckenkamp, K. Fuller, D. Morrow,
R. Myers
• Brown-M. Roegge
• Hancock- M. Hitz, T. Kraushaar, R. Myers, J.
Wilken
• McDonough- M. Mason
• Pike- C. Smith, M. Vose, L. Weir
• Schuyler- R. Myers, D. Simpson
• Morgan- T. Ringsdorf
Trapping Program
• Following map depicts WCR beetle counts
based upon yellow sticky trap captures.
• Traps were placed mid July and monitored for 4
weeks
• Threshold= 5 or more beetles/trap/day using 12
traps per field.
• This program used 4 traps per field
– The intent was not to make recommendations for
individual fields, but to get an overall idea of beetle
populations throughout the region
Yellow Sticky Trap Summary
• As in past years, highest populations
found in eastern and northern portion of
region
• Populations do not meet or exceed
established threshold of 5 or more beetles
per trap per day (however, we were not
using 12 traps per field, in which the
protocol was developed)
Root Evaluations
• From 2004-2006 we dug and evaluated root
systems from random rotated corn fields to
determine injury caused by the variant corn
rootworm larvae.
• The 2007 season was too dry to be able to dig
roots effectively (during late July, early August).
• The results from ’04-’06 indicated some level of
root feeding, but very minor on those fields
evaluated. The variant was present in those
fields but at low levels.
Recommendations
• With a few exceptions, expect little to no
likelihood of injury caused by the variant
corn rootworm on first year corn.
Recommendations
 Suggest producers in the eastern and northern portions of
the region consider using corn rootworm control strategies
to protect roots from injury in first year corn fields.
 Some fields or parts of fields in those regions could see
injury caused by the variant, however, injury could be
sporadic and random
 There was one area of the region that did experience the
variant population in ’07. Producers in that area should
expect a higher risk of injury.
 Mark Buss and Ron Myers found several fields that
experienced injury on rotated corn by the variant corn
rootworm. This area was located east of Augusta.
Recommendations
• Continue to evaluate/compare treatments
– Include root digs to evaluate differences in
root injury
– Evaluation should also include yield
differences
• Use yellow sticky traps to monitor
populations