2005 CORN ROOTWORM SOIL INSECTICIDE / SEED TREATMENT

 EFFICACY AND YIELD EXPERIMENT1

 

 

Final Report

 

 

 

University of Nebraska

Agricultural Research and Development Center

Mead, Nebraska

 

 

Lance J. Meinke, Jim Brown,

 Laura Campbell, Bill McCormick

 

Department of Entomology

University of Nebraska

Lincoln, Nebraska  68583-0816

           

 

 

 

 

 

Background information pertaining to the experiment conducted at the ARDC, near Mead, Nebraska during 2005.

Background Information - AgronomicBackground Information - Entomology
Experimental DesignEnvironmental Conditions at Planting
Rainfall and Irrigation Root Damage Evaluations

 

 


Agronomic

 

            Hybrids:                                    DKC 60-15, DKC-12

            Row Spacing:                            30 inches

            Planting Date:                           29 April 2005

            Planter:                                      Kinze model 2100, 4 row cone

            Planting Depth:                         2 inches

            Application Equipment:            Granular insecticide 

                                                              Planting: planter mounted cone-belt system

                                                              Liquid insecticide

                                                              Planter mounted CO2 pressurized sprayer

            Field Preparation:                      17 March 2005 - chopped and disked, 18 April 2005 - disked

            Herbicides Applied:                  4 May 2005: Harness Xtra, 2.0 qt/A, pre emerge

                                                              7 June 2005: 1.0 oz/A SPIRIT

            Fertilizer Applied:                    150 lb. N/A applied as NH3, 1 April 2005                                        

            Previous Crop:                          Continuous corn (trap crop)

 

            Soil Information:                                          

                  Type:                                   Silty clay loam            

                  Ph:                                               6.4                                  

                  CEC:                                         29.4                                 

                  % organic matter:                        2.8                                  

                  % clay:                                      29.05                                

                  % silt:                                        66.67                               

                  % sand:                                       4.28                                

 

           

            Insecticide History:                    Insecticide free: 1998, 2000, 2002

                                                               Multiclass soil insecticide trials: 1997, 1999, 2001, 2003

                                                                                                                                                                       

Entomological

 

            Species present:                          Northern corn rootworm, Diabrotica barberi Smith and Lawrence, and western corn rootworm, D. virgifera virgifera LeConte.  Initial rootworm egg hatch occurred between 30-31 May 2005 (predominantly western corn rootworm).

 

Root Evaluation:                  0-3 root rating scale (Oleson et al. 2005) was used to evaluate larval corn rootworm damage in each treatment.  Ten roots per replication were evaluated in each treatment.

            Root Evaluation Date:               14 July 2005

 

                                                              

Experimental Design

 

Design:                                Randomized complete block design

                                                                    Replicated four times

                                                                    Four-row treatments

                                                                   

            Row Length:                             60 feet

 

            Statistical Analysis:                   Root ratings, final stand, lodging, yields:  Used SAS Mixed Procedure; Protected LSD test was used for mean separation (P # 0.05) . 

 

 

Environmental

 

 

            Conditions at planting:

 

                  Air temperature:                                15EC

                  Wind speed:                                      15 mph at 5 ft height

                  Wind direction:                                 N - NW

                  Soil temperature 2" depth:                13.5EC

                  Soil temperature surface:                  27EC

                  Soil moisture, 0-3" depth:                 17.2 % water (gravimetric method)

                  % cloud cover:                                  10-15 % cloud cover 

                  % relative humidity:                          not recorded

                  Residue on surface:                           20% of soil surface covered with crop residue; soil moist, some clods on surface

 

 

Rainfall

 

April    06  0.08 inch

            10  0.21

            11  0.98       

            12  0.57

            16  0.01

            18  0.25

            20  0.84

            21  0.10

            22  0.13

              

Total          3.17                                                                        

May     10  0.22  inch

            11  0.86

            12  1.12         

            18  0.05                                                  

            25  0.21

            26  0.01                                                  

            29  0.09

            31  0.65

Total          3.21                                                  

 

June     01  0.11 inches                                       

            03  0.61

            04  0.63

            05  0.04

            09  0.68

            10  0.23

            11  0.06

            21  0.01

            25  0.04

            27  0.14

            29  0.01

 

Total          2.56

        

 

July      02  0.01  inches

            17  0.82

            18  0.02

            25 2.92

            26  0.18

           

Total         3.95    

 

Aug    10  0.34  inches

            12  0.01

            13  0.01

            17  0.01

            26  0.28

 

Total          0.65

           


 


Irrigation (through August 2005):

 

Sprinkler irrigation was applied as needed throughout the season.

 

July      01  1.75 inches                                        August     02   1.5 inches

07  1.5                                                                     10    1.0

            11  0.5

            12  2.0

            22  1.5

             

Table 1.   2005 Corn Rootworm Soil Insecticide / Neonicotinoid

Seed Treatment Efficacy and Yield Experiment

University of Nebraska Agricultural Research and Development Center, near Mead, NE

 Root Damage Rating, Final Stand, Percentage Lodging + SE


                  
TreatmentTreatment Rate1Mean Root Rating 2
0 - 3 Scale		Final3
Stand		Percentage4
Lodging
MON863 DKC 60-12 plus PonchoClothianidin 0.25mg ai/seed, ST0.07 + 0.03 a151.3 + 3.6 a0.0+ 0.0 a
Isoline DKC 60-15 plus Poncho 250 and Aztec 2.1GClothianidin 0.25 mg ai/seed, ST
Aztec: 0.141 oz ai/1000row-ft, TB		0.14 + 0.01 a143.0 + 4.4 a0.0 + 0.0 a
Isoline DKC 60-15 plus Poncho 1250 and Aztec 2.1GClothianidin 1.25 mg ai/seed, ST
Aztec: 0.141 oz ai/1000 row-ft, TB		0.16 + 0.02 a157.8 + 2.5 a0.0 + 0.0 a
Isoline DKC 60-15 plus Cruiser 5 FS and Force 3GThiamethoxam 1.25 mg ai/seed,ST
Force: 0.12 oz ai/1000 row-ft, TB		0.18 + 0.05 a148.0 + 9.8 a0.0 + 0.0 a
Isoline DKC 60-15 plus Poncho 1250 and Force 3GClothianidin 1.25 mg ai/seed, ST
Force: 0.12 oz ai/1000 row-ft, TB		0.20 + 0.06 a152.8 + 6.4 a0.0 + 0.0 a
Isoline DKC 60-15 plus Regent 4 SC0.13 lb ai/A, I, 5 gpa , MT0.24 + 0.08 a143.5 + 4.5 a2.3 + 2.3 a
Isoline DKC 60-15 plus Aztec 2.1GAztec: 0.141oz ai / 1000 row-ft, TB0.24 + 0.09 a148.3 + 5.6 a0.0 + 0.0 a
Isoline DKC 60-15 plus Force 3GForce: 0.12 oz ai / 1000 row-ft, TB0.33 + 0.08 a153.5 + 5.7 a0.0 + 0.0 a
Isoline DKC 60-15 plus Poncho 250 and Regent 4 SCClothianidin 0.25 mg ai/seed, ST
Regent: 3.25 oz/A rate, I, 5gpa, MT		0.34 + 0.20 a148.8 + 5.3 a0.0 + 0.0 a
Isoline DKC 60-15 plus Poncho 1250Clothianidin 1.25 mg ai/seed, ST0.40 + 0.13 ab151.8 + 3.7 a0.0 + 0.0 a
Isoline DKC 60-15 plus Poncho 250Clothianidin 0.25 mg ai/seed, ST0.73 +0.17 bc48.0 + 7.9 a2.1 + 1.3 a
Isoline DKC 60-15 plus Cruiser 5 FSThiamethoxam 1.25 mg ai/seed, ST0.82 + 0.29 c139.5 + 7.9 a0.9 + 0.9 a
Isoline DKC 60-15 1.66 + 0.33 d147.8 + 2.5 a23.4 + 14.4 b

 

 

Planting date: 29 April 2005;  Plot size: four rows x 60 ft per treatment per replication, 4 replications; means within columns followed by the same letter are not significantly different (P > 0.05, Fishers Protected LSD Test).

 

1 I=placement into open seed furrow, ST=seed treatment, TB=T-band (7 inch band placed over open seed furrow), MT=microtube application

2 Root evaluation date: 14 July 2005, rated 10 roots from two outside rows per treatment per replication using 0-3 node injury scale (Oleson et al. 2005)

3 Final stand = number of plants per 100 ft harvested in two center rows of each plot, stands recorded during October 2005 during harvest

4 Percentage lodging = proportion of final stand leaning >45 degree angle x 100

                                          


Table 2.   2005 Corn Rootworm Soil Insecticide / Neonicotinoid

Seed Treatment Efficacy and Yield Experiment

University of Nebraska Agricultural Research and Development Center, near Mead, NE

Mean Root Damage Rating and  Yield + SE


TreatmentTreatment Rate 1Mean Root Rating2
(0 - 3 Scale)		Bulk Yield 3
(bushels per acre)
MON 863 DKC 60-12 plus PonchoClothianidin 0.25 mg ai/seed, ST0.07 + 0.03 a236.4 + 5.3 a
Isoline DKC 60-15 plus Poncho 250
and Aztec 2.1G		Clothianidin 0.25 mg ai/seed, ST
Aztec: 0.141 oz ai/ 1000 row-ft, TB		0.14 + 0.01 a227.2 + 5.5 ab
Isoline DKC 60-15 plus Poncho 1250
and Aztec 2.1G		Clothianidin 1.25 mg ai/seed, ST
Aztec: 0.141 oz ai/ 1000 row-ft, TB		0.16 + 0.02 a231.8 + 2.2 ab
Isoline DKC 60-15 plus Cruiser 5 FS
and Force 3G		Thiamethoxam 1.25 mg ai/seed, ST
Force: 0.12 oz ai/ 1000 row-ft, TB		0.18 + 0.05 a225.3 + 9.8 ab
Isoline DKC 60-15 plus Poncho 1250
and Force 3G		Clothianidin 1.25 mg ai/seed, ST
Force: 0.12 oz ai/ 1000 row-ft, TB		0.20 + 0.06 a224.0 + 5.9 ab
Isoline DKC 60-15 plus Regent 4 SC0.13 lb ai/A, I, 5 gpa , MT0.24 + 0.08 a217.9 + 4.4 b
Isoline DKC 60-15 plus Aztec 2.1GAztec: 0.141oz ai / 1000 row-ft, TB0.24 + 0.09 a223.2 + 8.5 ab
Isoline DKC 60-15 plus Force 3GForce: 0.12 oz ai / 1000 row-ft, TB0.33 + 0.08 a218.6 + 5.6 ab
Isoline DKC 60-15 plus Poncho 250
and Regent 4 SC		Clothianidin 0.25 mg ai/seed, ST
Regent: 3.25 oz/A rate, I, 5 gpa, MT		0.34 + 0.20 a225.2 + 6.1 ab
Isoline DKC 60-15 plus Poncho 1250Clothianidin 1.25 mg ai/seed, ST0.40 + 0.13 ab233.1 + 6.6 ab
Isoline DKC 60-15 plus Poncho 250Clothianidin 0.25 mg ai/seed, ST0.73 + 0.17 bc216.2 + 10.3 b
Isoline DKC 60-15 plus Cruiser 5 FSThiamethoxam 1.25 mg ai/seed, ST0.82 + 0.29 c217.3 + 2.5 b
Isoline DKC 60-15 1.66 + 0.33 d198.4 + 18.8 c

 

Planting date: 29 April 2005; Plot size: four rows x 60 ft per treatment per replication, 4 replications; means within columns followed by the same letter are not significantly different (P > 0.05, Fishers Protected LSD Test).

 

1I=placement into open seed furrow, ST=seed treatment, TB=T-band (7 inch band placed over open seed furrow), MT=microtube application

2 Root evaluation date: 14 July 2005, rated 10 roots from two outside rows per treatment per replication using 0-3 node injury scale (Oleson et al. 2005)

3 Bulk yields: hand harvested and shelled middle 50 ft of the two inside rows / plot during October 2005, presented as bushels of corn @ 15.5% moisture