Annual summary of field crop insect management trials, Department of Crop Services, University of Illinois. Providing accurate and unbiased evaluations of insect control products and management strategies to assist growers in Illinois.University of Illinois Extension and Department of Crop Science

Estes, Ronald E.

Gray, Michael E.

Heeren, Joshua R.

Integrated Pest Management

Steffey, Kevin L.

Tinsley, Nicholas A.

English

Illinois Digital Environment for Access to Learning and Scholarship Repository

CORNUniversity of Illinois Extension • College of Agricultural, Consumer and Environmental Sciences • Department of Crop Sciences 16on Target 2008 Annual summary of field crop insect management trials, Department of Crop Sciences, University of IllinoisSeCtiON 2Comparison of experimental and commercially available granular insecticides to control corn rootworm larvae (Diabrotica spp.) in Illinois, 2008Ronald e. estes, Joshua R. Heeren, Nicholas A. tinsley, Kevin L. Steffey, and Michael e. GrayLocationWe established one trial at the University of Illinois Agricultural Engineering Farm near Urbana (Champaign County).Experimental Design and MethodsThe experimental design was a randomized complete block with four replications. The plot size for each treatment was 5 ft (two rows) x 30 ft. Five randomly selected root systems were extracted from the first row of each plot on 22 July. The root systems were washed and rated for corn rootworm larval injury using the 0 to 3 node-injury scale developed by Oleson et al. (2005) (Appendix I). Percentage of lodged plants (plants leaning at 45° or less from the soil surface) was determined on 22 September.Planting and Insecticide ApplicationThe trial was planted on 7 May using a four-row, Almaco constructed planter with John Deere 7300 row units with Precision Planting finger pick-up style metering units. All granular insecticides were applied through modified SmartBox metering units mounted to each row of the planter. Plastic tubes directed the insecticide granules to the seed furrow. All insecticides were applied in front of the planter’s firming wheels. Cable-mounted tines were attached behind each of the planter row units to improve insecticide incorporation.Active ingredients for all chemical insecticides, except those with experimental numbers, are listed in Appendix II.Agronomic InformationAgronomic information is listed in Table 2.1.Climatic ConditionsTemperature and precipitation data are presented in Appendix III.Statistical AnalysisData were analyzed using ARM 7 (Agricultural Research Manager), revision 7.4.2. (Copyright© 1982–2008 Gylling Data Management, Inc., Brookings, SD).Results and DiscussionThe level of rootworm injury to the untreated check (UTC) plots was moderate to high, with a mean node-injury rating of 2.11. All of the granular insecticide treatments provided acceptable protection (node-injury ratings <1.0) against corn rootworm larval damage with node-injury ratings ranging from 0.09 to 0.89, all significantly less than the mean node-injury rating of the UTC. Counter 15G and 20G provided excellent root protection with node-injury ratings of 0.14 and 0.09, respectively, although not statistically different from the mean node-injury ratings for the other granular products in the trial. Percentage lodging values for all plots were assessed on 22 September. Plots treated with Fortress Plus 5G and both Counter 15G and 20G had significantly less lodging than the untreated check plots.tAbLe 2.1 • Agronomic information for efficacy trial of experimental and commercially available insecticides to control corn rootworm larvae, Urbana, University of Illinois, 2008Planting date 6 MayRoot evaluation date 22 JulyRow spacing 30 inchesSeeding rate 33,000/acrePrevious crop Trap crop (late-planted corn and pumpkins)Tillage Fall—chisel plowSpring—field cultivatorCORNUniversity of Illinois Extension • College of Agricultural, Consumer and Environmental Sciences • Department of Crop Sciences 17on Target 2008 Annual summary of field crop insect management trials, Department of Crop Sciences, University of IllinoistAbLe 2.2 • Evaluation of experimental and commercially available insecticides for control of corn rootworm larvae, Urbana, University of Illinois, 2008Product1 Rate2 Placement Mean node-injury rating3,4,522 July% lodging5,622 SeptAMV 101G 3.7 Furrow 0.86 b 43 abCounter 15G 8.0 Furrow 0.14 b 9 bCounter 20G 6.0 Furrow 0.09 b 24 bFortress 5G 3.7 Furrow 0.89 b 55 abFortress Plus 5G 3.7 Furrow 0.56 b 24 bUTC7 — — 2.11 a 81 a1 All insecticides were applied with modified SmartBox metering units.2 Rates of application for band and furrow placements are ounces (oz) of product per 1,000 ft of row.3 Mean node-injury ratings are based on the 0 to 3 node-injury scale (Oleson et al. 2005, Appendix I).4 Mean node-injury ratings were derived from five root systems per treatment in each of four replications.5 Means followed by the same letter do not differ significantly (P = 0.05, Duncan’s New Multiple Range Test).6 Percentage of plants leaning at 45° or less from the soil surface.7 UTC = untreated check.

Comparison of experimental and commercially available granular insecticides to control corn rootworm larvae (Diabrotica spp.) in Illinois, 2008

IDEALS @ Illinois

Comparison of experimental and commercially available transgenic rootworm hybrids and granular insecticides to control corn rootworm larvae (Diabrotica spp.) in Illinois, 2008

CORNUniversity of Illinois Extension • College of Agricultural, Consumer and Environmental Sciences • Department of Crop Sciences 20on Target 2008 Annual summary of field crop insect management trials, Department of Crop Sciences, University of IllinoisSeCtiON 4Comparison of experimental and commercially available transgenic rootworm hybrids and granular insecticides to control corn rootworm larvae (Diabrotica spp.) in Illinois, 2008Ronald e. estes, Joshua R. Heeren, Nicholas A. tinsley, Kevin L. Steffey, and Michael e. GrayLocationWe established one trial at the University of Illinois Agricultural Engineering Farm near Urbana (Champaign County).Experimental Design and MethodsThe experimental design was a randomized complete block with four replications. The plot size for each hybrid was 20 ft (eight rows) x 30 ft. Five randomly selected root systems were extracted from the center two rows of each eight-row plot on 1 and 26 August. The root systems were washed and rated for corn rootworm larval injury using the 0 to 3 node-injury scale developed by Oleson et al. (2005) (Appendix I).Planting InformationThe trial was planted on 22 May using a four-row, Almaco constructed planter with John Deere 7300 row units. Precision cone units were used to plant the seeds. Granular insecticides were applied through modified Noble metering units mounted to each row of the planter. Plastic tubes directed the insecticide granules to either a 5-inch, slope-compensating bander or into the seed furrow. All insecticides were applied in front of the planter’s firming wheels. Cable-mounted tines were attached behind each of the planter row units to improve insecticide incorporation.Agronomic InformationAgronomic information is listed in Table 4.1.Climatic ConditionsTemperature and precipitation data are presented in Appendix III.Statistical AnalysisData were analyzed using ARM 7 (Agricultural Research Manager), revision 7.4.2. (Copyright© 1982–2007 Gylling Data Management, Inc., Brookings, SD).Results and DiscussionThe mean node-injury ratings taken on two dates are presented in Table 4.2. The mean node-injury ratings in the non-Bt check were 2.36 and 2.63 on 1 and 26 August, indicating that corn rootworm larval injury was severe. The mean node-injury ratings for all rootworm control products were significantly lower than the mean node-injury rating for the non-Bt check on both 1 and 26 August. On 1 August, YieldGard VT3 Pro/Herculex RW and YieldGard VT/RR2 + Aztec 2.1G had significantly less corn rootworm larval injury than Herculex XTRA/RR2 and the non-Bt check. On 26 August, SmartStax, YieldGard VT3 Pro/ Herculex RW, and YieldGard VT/RR2 + Aztec 2.1G had significantly less corn rootworm larval injury than Herculex XTRA/RR2 and the non-Bt check. The mean node-injury ratings for the non-Bt corn hybrid (Roundup Ready 2) treated with Aztec 2.1G were not significantly different from the mean node-injury ratings for YieldGard VT/RR2 + Aztec 2.1G, YieldGard VT/RR2, YieldGard VT3 Pro/Herculex RW, and SmartStax on either 1 or 26 August. All of the granular insecticides and transgenic hybrids performed well, with node-injury scores not exceeding 0.66 by the second evaluation date.tAbLe 4.1 • Agronomic information for efficacy trial of experimental and commercially available transgenic rootworm hybrids and granular insecticides to control corn rootworm larvae, Urbana, University of Illinois, 2008Planting date 22 MayRoot evaluation dates 1 and 26 AugustRow spacing 30 inchesSeeding rate 33,000/acrePrevious crop Trap crop (late-planted corn and pumpkins)Tillage Fall—chisel plowSpring—field cultivatorCORNUniversity of Illinois Extension • College of Agricultural, Consumer and Environmental Sciences • Department of Crop Sciences 21on Target 2008 Annual summary of field crop insect management trials, Department of Crop Sciences, University of IllinoistAbLe 4.2 • Evaluation of experimental and commercially available transgenic rootworm hybrids and granular insecticides for control of corn rootworm larvae, Urbana, University of Illinois, 2008Treatment/transgenic trait Rate1 Placement Mean node-injury rating2,3,41 AugustMean node-injury rating2,3,426 AugustRoundup Ready 2 (non-Bt check) — — 2.36 a 2.63 aRoundup Ready 2 +Aztec 2.1G 6.7 Band0.29 bc 0.25 cdYieldGard VT/RR2 +Aztec 2.1G 6.7 Band0.02 c 0.01 dYieldGard VT/RR2 — — 0.37 bc 0.48 bcYieldGard VT3 Pro/Herculex RW5 — — 0.01 c 0.05 dHerculex XTRA/RR2 — — 0.54 b 0.66 bSmartStax — — 0.04 bc 0.03 d1 Rates of application for granular insecticides are ounces (oz) of product per 1,000 ft of row.2 Mean node-injury ratings are based on the 0 to 3 node-injury scale (Oleson et al. 2005, Appendix I).3 Mean node-injury ratings were derived from five root systems per treatment in each of four replications.4 Means followed by the same letter do not differ significantly (P = 0.05, Duncan’s New Multiple Range Test).5Treatment combination was evaluated for experimental purposes only and is not commercially available.

Comparison of experimental and commercially available granular insecticides to control corn rootworm larvae (Diabrotica spp.) in Illinois, 2008

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