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9
87
65
43
21
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10279
280
122
280
281B
Soil Applied Insecticide (SAI)
²ST2013IA198A
0 640 1,280 1,920 2,560320Feet
©2013 Iowa Soybean Association
County: Keokuk
CRW Injury RatingNode-Injury Scale (0-3)!> 0.0!> 0.1 - 0.5!> 0.6 - 1.0!> 1.1 - 1.5!> 1.6 - 2.0
Soil Survey
Sampling Area SAI
Mean
Trial Detail: Aztec 4.67G on Corn
13579
11
Untreated 0 0 0 0.2 0.2 0.1
0.1 0.1 0.1 0.1 0.4 0
Hybrid:Previous Crop:
2.5 7.6 7.8 2.3 1.5 0.3
Rainfall (in.)MonthMarchAprilMayJuneJuly
August
DeKalb DKC62-08RIBCorn on Corn (3 years)
Corn Rootworm (CRW) Injury Rating
0.1 0.1
Sampling Area24681012
0.0 0.1 0.0 0.1 0.0 0.1 0.2 0.1 0.20.4
0.1 0.00.0
0.5
1.0
1.5
2.0
2.5
3.0
SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt
1 2 3 4 5 6 7 8 9 10 11 12
INJURY RATING (0‐3 SCALE)
TREATMENT AND SAMPLING AREAS
ST2013IA198A ‐ CRW Injury Rating
65.8
47.259.8
77.0
47.0
70.8
52.5 51.334.7
48.860.7 57.3
0.0
20.0
40.0
60.0
80.0
100.0
120.0
SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt
1 2 3 4 5 6 7 8 9 10 11 12
ROOT WEIGHT (G)
TREATMENT AND SAMPLING AREAS
ST2013IA198A ‐ Root Weight
32500 32000
3450033000 33500
3200033000
34500
3200031000
3350032500
20000
25000
30000
35000
40000
SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt
1 2 3 4 5 6 7 8 9 10 11 12
POPULATION (PLANTS/A)
TREATMENT AND SAMPLING AREAS
ST2013IA198A ‐ Population
0 0 0 0 0 2 0 0 0 0 0 00
20
40
60
80
100
SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt SAI Unt
1 2 3 4 5 6 7 8 9 10 11 12
LODGING (%)
TREATMENT AND SAMPLING AREAS
ST2013IA198A ‐ Lodging
CRW Injury Rating (0‐3)
Soil Applied Insecticide Untreated
0.1 0.1
A paired T‐test did not show evidence of significant differenceRoot injury rating reported is the average of 6 roots, collected by digging every 5th plant in each sampling area. Sampling areas were picked based on predominant soil types within the field. Roots were washed and rated for corn rootworm injury using the Iowa State University Node‐Injury Scale ‐ Oleson, J.D., Y. Park, T.M. Nowatzki, and J.J. Tollefson. 2005. J. Econ Entomol. 98(1): 1‐8.
Root Weight (g)
Soil Applied Insecticide Untreated
53.4 58.7
A paired T‐test did not show evidence of significant difference
After injury ratings were taken, the 6 roots from each sampling point were left to dry overnight and then weighed the next day.
Population (Plants/A)
Soil Applied Insecticide Untreated
33,167 32,500
A paired T‐test did not show evidence of significant difference
Plant population was calculated from the number of plants in 17.5 feet of row in 2 rows (2/1000 of an acre).
Lodging (%)
Soil Applied Insecticide Untreated
0% 0%
A paired T‐test did not show evidence of significant difference
Lodging was based on the percent of plants that were lodged in the 17.5 feet of row in 2 rows (2/1000 of an acre).