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CONTROL OF SECOND GENERATION EUROIPEAN CORN BORER WITH SMARTSTAX, 2010

CONTROL OF SECOND GENERATION EUROIPEAN CORN BORER WITH SMARTSTAX, 2010 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F29 (F29) FIELD CORN: Zea mays L. Nicholas A. Tinsley Visiting Research Specialist Department of Crop Sciences University of Illinois at Urbana-Champaign 1102 S. Goodwin Ave. Urbana, IL 61801 Phone: 217-265-4113 Fax: 217-333-5299 E-mail: tinsley@illinois.edu Ronald E. Estes Senior Research Specialist E-mail: restes@illinois.edu Michael E. Gray Professor and Assistant Dean, ANR Extension E-mail: megray@illinois.edu European corn borer (ECB): Ostrinia nubilalis (Hübner) We established a trial at the University of Illinois Agricultural Engineering Farm near Urbana, IL, to evaluate the efficacy of SmartStax in controlling second generation ECB. The experimental design was a randomized complete block with four replications. The plot size for each treatment was 10 ft (four rows) x 20 ft. The trial was planted on 26 May using a four-row, vacuum style planter constructed by Seed Research Equipment Solutions (South Hutchinson, KS). The previous crop for this experiment was corn and the site was cultivated prior to planting. Seeds were planted at a rate of 35,000 seeds/acre in 30-in rows at an approximate depth of 1.75 in. Hybrids evaluated included Mycogen 2D692 (SmartStax, Cry1A.105 + Cry2Ab2 + Cry1F) and Mycogen ST-6808 (untreated check [UTC]) (Dow AgroSciences, Indianapolis, IN). Seed was treated with thiamethoxam, 0.25 mg active ingredient per seed. A Davis inoculator was used to place approximately 90 neonate ECB larvae near the tip of the ear on 10 consecutive plants in row two of each plot on 5 Aug (at the R1 growth stage). Densities of ECB larvae were assessed on 7 Sep (33 days after infestation [DAI]). Densities were estimated by splitting the stalks of 10 plants in each plot and counting the total number of larvae. The number and total length of any tunnels that were present were recorded for each plant that was evaluated. Data were analyzed using ARM 7, revision 7.5.1 (Gylling Data Management, Inc., Brookings, SD). Duncan’s New Multiple Range Test (DNMRT) was performed to provide mean separations (P = 0.05). Means for the number of ECB larvae per plant, number of tunnels per plant, and tunnel length per plant are reported in Table 1. No European corn borer larvae or tunnels were observed in any plot with SmartStax plants. The UTC averaged 0.85 European corn borer larvae per plant and 1.58 tunnels per plant. The mean total tunnel length for UTC plants was 7.95 cm. This research was supported by industry gifts of research funding. Table 1. Treatment ECB/plant Tunnels/plant Tunnel length/plant SmartStax (Mycogen 2D692) 0.00b 0.00b 0.00b UTC (Mycogen ST-6808) 0.85a 1.58a 7.95a Means within a column followed by the same letter do not differ significantly (P = 0.05, DNMRT). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF SECOND GENERATION EUROIPEAN CORN BORER WITH SMARTSTAX, 2010

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10.4182/amt.2012.F29
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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F29 (F29) FIELD CORN: Zea mays L. Nicholas A. Tinsley Visiting Research Specialist Department of Crop Sciences University of Illinois at Urbana-Champaign 1102 S. Goodwin Ave. Urbana, IL 61801 Phone: 217-265-4113 Fax: 217-333-5299 E-mail: tinsley@illinois.edu Ronald E. Estes Senior Research Specialist E-mail: restes@illinois.edu Michael E. Gray Professor and Assistant Dean, ANR Extension E-mail: megray@illinois.edu European corn borer (ECB): Ostrinia nubilalis (Hübner) We established a trial at the University of Illinois Agricultural Engineering Farm near Urbana, IL, to evaluate the efficacy of SmartStax in controlling second generation ECB. The experimental design was a randomized complete block with four replications. The plot size for each treatment was 10 ft (four rows) x 20 ft. The trial was planted on 26 May using a four-row, vacuum style planter constructed by Seed Research Equipment Solutions (South Hutchinson, KS). The previous crop for this experiment was corn and the site was cultivated prior to planting. Seeds were planted at a rate of 35,000 seeds/acre in 30-in rows at an approximate depth of 1.75 in. Hybrids evaluated included Mycogen 2D692 (SmartStax, Cry1A.105 + Cry2Ab2 + Cry1F) and Mycogen ST-6808 (untreated check [UTC]) (Dow AgroSciences, Indianapolis, IN). Seed was treated with thiamethoxam, 0.25 mg active ingredient per seed. A Davis inoculator was used to place approximately 90 neonate ECB larvae near the tip of the ear on 10 consecutive plants in row two of each plot on 5 Aug (at the R1 growth stage). Densities of ECB larvae were assessed on 7 Sep (33 days after infestation [DAI]). Densities were estimated by splitting the stalks of 10 plants in each plot and counting the total number of larvae. The number and total length of any tunnels that were present were recorded for each plant that was evaluated. Data were analyzed using ARM 7, revision 7.5.1 (Gylling Data Management, Inc., Brookings, SD). Duncan’s New Multiple Range Test (DNMRT) was performed to provide mean separations (P = 0.05). Means for the number of ECB larvae per plant, number of tunnels per plant, and tunnel length per plant are reported in Table 1. No European corn borer larvae or tunnels were observed in any plot with SmartStax plants. The UTC averaged 0.85 European corn borer larvae per plant and 1.58 tunnels per plant. The mean total tunnel length for UTC plants was 7.95 cm. This research was supported by industry gifts of research funding. Table 1. Treatment ECB/plant Tunnels/plant Tunnel length/plant SmartStax (Mycogen 2D692) 0.00b 0.00b 0.00b UTC (Mycogen ST-6808) 0.85a 1.58a 7.95a Means within a column followed by the same letter do not differ significantly (P = 0.05, DNMRT).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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