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Herculex XTRA and Standard Soil Insecticide Evaluations, Clay Center, NE, 2007

Terry A DeVries, University of Nebraska, South Central Ag Laboratory, Clay Center, NE 68933 Robert J W right, Dept. Of Entomology, University of Nebraska-Lincoln, Lincoln NE 68583-0816, [email protected]

Background information pertaining to corn rootworm experiments conducted at Clay Center, NE during 2007. __________________________________________________________________________________________ Agronomic Hybrids: Row Spacing: Row Orientation: Planting Date: Planter: Planting Depth: Application Equipment: Pioneer 34A17 and 34A20 30 inches North-South 02 May 2007 2-row 7100 JD Maximerge with finger pickup units. 2 inches Granular Insecticides: Standard insecticide boxes and Smart Box® application system. Late planted corn Crete silt loam Broadcasted: Radius @ 18 fl oz/acre, Atrazine 90DF @ 1.25 lbs/acre, Roundup Original Max @ 22 fl oz/acre and AMS @ 17 lbs/100 gal solution after planting on 02 May 2007. Broadcasted: Atrazine 90DF @ 1.25 lbs/acre on 08 June 2007. 150 lbs N/acre knifed in as NH3 on 16 April 2007.

Previous Crop: Soil Information: Herbicides Applied:

Fertilizer Applied:

© 2008 South Central Agricultural Laboratory | 851 Highway 6, Harvard, NE 68944 | 402-762-4403

Data Collection: Plant Population: Extended Leaf Height:

The total number of plants per plot were recorded on 29 May 2007. Extended leaf heights were recorded in inches from 20 randomly selected plants per plot on 20 June 2007. The total number of lodged plants per plot were recorded on 10 July 2007. The total number of broken and lodged/leaning plants were also recorded on 05-06 September 2007. Plots were machine harvested on 12 October 2007. Percent moisture and lbs of grain were recorded and converted to 56 lbs/bu @ 15.5% moisture to evaluate yield.

Lodged Plants:

Harvest Evaluations:

Entomological Data: Species present:

Predominantly western corn rootworm, Diabrotica virgifera virgifera LeConte, and a few northern corn rootworm, D. barberi Smith and Lawrence. First observed on 25 May 2007. Iowa 0-3 root damage scale was used to evaluate larval corn rootworm injury in each treatment per replication. Five randomly selected plants were dug from each plot. 13 July 2007

CRW egg hatch: Root Evaluation:

Root Evaluation Date: Experimental Design Design:

Randomized complete block Replicated six times 1 row x 145 feet PROC MIXED, with mean separation using the differences of least square means (MIXED; p|t|>0.05).

Plot Size: Statistical Analyses:

Environmental Conditions at planting: Wind direction and speed: Soil surface condition: Subsoil moisture:

E @ 10-20 mph Excellent Excellent

© 2008 South Central Agricultural Laboratory | 851 Highway 6, Harvard, NE 68944 | 402-762-4403

Record of Rainfall: (April 1 - October 15*) Date April 1 April 10 April 24 May 6 May 15 May 23 May 28 May 30 June 13 June 14 June 18 July 9 July 16 July 19 July 30 August 23 August 29 September 7 September 10 September 17 September 24 October 1 October 4 October 7 October 15 Total Amount (Inches) 0.80 0.55 2.50 1.75 1.40 0.60 0.25 0.17 0.55 0.70 0.60 2.25 0.75 0.10 0.70 2.45 1.25 1.00 0.25 0.90 0.35 0.25 1.60 1.30 1.30 24.32 Month April May June July August September October* Total Total (Inches) 3.85 4.17 1.85 3.80 3.70 2.50 4.45 24.32

Seasonal Record of Irrigation: Date June 30 July 17 July 27 August 7 August 16 August 21 Total

Amount (Inches) 1.45 0.66 1.37 1.36 1.36 1.38 7.58

Month June July August Totals

Total (Inches) 1.45 2.03 4.10 7.58

© 2008 South Central Agricultural Laboratory | 851 Highway 6, Harvard, NE 68944 | 402-762-4403

Herculex® XTRA and Standard Soil Insecticide Evaluations, Clay Center, NE, 2007

Avg. Yield Insecticide Hybrid Trait1 Product2 Rate of Insecticide Insecticide Placement

3

Root Ratings 3 (0-3 Scale) (13 July)

Avg. No. of Lodged Plants (10 July)

3

Avg. Extended Leaf Height (Inches) (20 June)

3

Avg. No. Of Plants Per Acre 4 (29 May)

(bu/acre) (12 October)

______________________________________________________________________________________________________________________________________________________ Pioneer 34A20 Pioneer 34A20 Pioneer 34A17 Pioneer 34A20 Pioneer 34A17 Pioneer 34A17 HXX HXX HX1 HXX HX1 HX1 Aztec 4.67G Counter 15G Counter 15G --------------Lorsban 15G --------------2.3 oz/1000 row ft 6.0 oz/1000 row ft 8.0 oz/1000 row ft --------------------8.0 oz/1000 row ft --------------------In furrow T-band T-band ----------T-band ----------189.0 a 184.8 a 184.2 a 179.9 a 178.8 a 159.9 b 0.16 a 0.21 a 0.50 ab 0.28 a 0.63 b 0.98 c 9.0 a 9.5 a 50.0 bc 17.7 ab 78.2 cd 101.3 d 49.8 a 50.3 a 47.7 b 50.1 a 51.0 a 50.7 a 30,332 29,901 29,814 29,485 29,997 29,652

Treatment Probability

® ®

0.0054

®

0.0002

<.0001

0.0250

0.6626

______________________________________________________________________________________________________________________________________________________

1 2 3 4

HXX; contains both Herculex

I and Herculex

Rootworm genes and HX1; contains Herculex

®

I insect protection.

Aztec 4.67G and Counter 15G granular insecticides were applied via the Smart Box

application system and Lorsban 15G was applied via standard insecticide boxes.

Means in column followed by the same lowercase letter are not statistically different using the differences of least square means (MIXED; p|t|>0.05). Means in column are not statistically different using the differences of least square means (M IXED; p|t|>0.05).

© 2008 South Central Agricultural Laboratory | 851 Highway 6, Harvard, NE 68944 | 402-762-4403

Herculex® XTRA and Standard Soil Insecticide Evaluations, Clay Center, NE, 2007

Avg. No. Of Plants Broken Insecticide Hybrid Trait1 Product 2 Rate of Insecticide Insecticide Placement Below the Ear

4

Avg. No. Of Plants Broken At or Above the Ear (05-06 September)

4

Avg. No. Of Lodged and/or Leaning Plants 3 (05-06 September)

(05-06 September)

______________________________________________________________________________________________________________________________________________________ Pioneer 34A20 Pioneer 34A20 Pioneer 34A17 Pioneer 34A20 Pioneer 34A17 Pioneer 34A17 HXX HXX HX1 HXX HX1 HX1 Aztec 4.67G Counter 15G Counter 15G --------------Lorsban 15G --------------2.3 oz/1000 row ft 6.0 oz/1000 row ft 8.0 oz/1000 row ft --------------------8.0 oz/1000 row ft --------------------In furrow T-band T-band ----------T-band ----------1.2 2.0 1.5 1.2 2.5 1.8 0.7 0.0 0.8 0.0 0.7 0.3 10.0 a 13.3 a 55.0 bc 21.8 ab 84.5 cd 114.7 d

Treatment Probability

® ®

0.5447

®

0.3465

<.0001

______________________________________________________________________________________________________________________________________________________

1 2 3 4

HXX; contains both Herculex

I and Herculex

Rootworm genes and HX1; contains Herculex

®

I insect protection.

Aztec 4.67G and Counter 15G granular insecticides were applied via the Smart Box

application system and Lorsban 15G was applied via standard insecticide boxes.

Means in column followed by the same lowercase letter are not statistically different using the differences of least square means (MIXED; p|t|>0.05). Means in column are not statistically different using the differences of least square means (M IXED; p|t|>0.05).

© 2008 South Central Agricultural Laboratory | 851 Highway 6, Harvard, NE 68944 | 402-762-4403

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