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9

87

65

43

21

1211

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).