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LARVAL WIREWORM CONTROL, 2004C

LARVAL WIREWORM CONTROL, 2004C (F18) CORN (FIELD): Zea mays L. ‘NC+ 5433RB’ Terry DeVries University of Nebraska-Lincoln South Central Agricultural Laboratory 842 Road 313, P.O. Box 66 Clay Center, NE 68933 Phone: (402) 762-4405 Fax: (402) 762-4411 E-mail: tdevries1@unl.edu Robert J. Wright University of Nebraska-Lincoln 202 Plant Industry Bldg. Dept. of Entomology Lincoln NE 68583-0816 E-mail: rwright2@unl.edu Wireworm (WW); Melanotus sp. The interaction of seed treatments, planting depth, press wheel adjustment and pre-emergence herbicide applications were evaluated for their impacts on yield and effectiveness against larval wireworm on a Crete silt loam at Clay Center, NE. Experimental design was a RCB with 4 replicates. Each plot consisted of a single 50 ft row with 30-inch spacing between rows. The field was planted to soybeans during the 2003 growing season. ‘NC+ 5433RB’ hybrid field corn was planted (N-S row orientation) on 19 Apr with a 2-row JD Maximerge planter with finger pickup seed metering units. Soil temperature at 4 inches was 60ºF at planting. Seed treatments were commercially applied (ST). Corn was planted either at a 1.25 or 2 inch depth. Planter press wheels were adjusted for either optimum seed to soil contact or positioned upwards so that no seed to soil contact occurred (open seed trench). Immediately after planting, labeled rates of pre-emergence (PRE) herbicides (Epic DF and Aatrex-Nine-O) were broadcast over the north ½ of the test site. Precipitation on 22 Apr (0.50 inches) and 24 Apr (0.35 inches) moved loose soil into the open seed trenches and covered the seed. Established plant populations were evaluated on 12 May. The total number of plants were recorded for each plot and converted to plants per acre (PPA). On 3 Jun, a post-emergence herbicide application of RoundUp WeatherMax was broadcast over the entire test site. Extended leaf heights (ELHs) were evaluated on 24 Jun. ELHs were recorded from 20 randomly selected plants in the middle of each plot. Plots were machine harvested on 11-12 Oct. Percent moisture and lbs of grain were recorded and corrected to 56 lbs/bu at 15.5% moisture. Yield levels were also corrected for 0.17% handling shrinkage for every moisture percentage point above 15.5% grain moisture. Data were analyzed using ANOVA with mean separation using Fisher’s protected LSD (P ≤ 0.05). Wireworm injury was very low at the test site but enough to measure the differences among treatments. No herbicide injury was observed. Minor rodent and/or bird feeding damage was observed in some plots in which the seed trench was not closed. In general, the major factor limiting PPA, ELHs and yield levels was press wheel adjustment. Optimum seed to soil contact statistically enhanced PPA, ELH and yield. Further, a 2-inch planting depth in combination with no seed to soil contact resulted in both significantly greater PPA and yield compared to a planting depth of 1.25 inches with no seed to soil contact. Optimum PRE Avg Treatment/ Rate amt planting Press wheel herbicide Avg ELH Yield a b c d formulation product/kernel Placement depth adjustment application PPA (inches) (bu/acre) Poncho 250 0.25 mg ST 1.25 Yes No 31,363a 60.75a 253.1a Poncho 250 0.25 mg ST 2 Yes Yes 31,102a 60.65a 251.2ab Poncho 250 0.25 mg ST 1.25 Yes Yes 30,666a 60.05ab 249.7ab Untreated --- --- 1.25 Yes No 30,579a 59.65abc 249.1ab Untreated --- --- 2 Yes Yes 29,882ab 58.23abcd 247.1ab Poncho 250 0.25 mg ST 2 Yes No 29,882ab 58.10abcd 244.4ab Untreated --- --- 2 Yes No 29,185ab 57.88abcd 242.7ab Poncho 250 0.25 mg ST 2 No No 29,098ab 57.20bcde 233.2ab Untreated --- --- 1.25 Yes Yes 29,011ab 57.05cde 225.7abc Poncho 250 0.25 mg ST 2 No Yes 28,924ab 57.05cde 224.9abc Untreated --- --- 2 No Yes 27,530bc 56.88cde 222.5bc Untreated --- --- 2 No No 25,439c 56.85cde 196.2c Poncho 250 0.25 mg ST 1.25 No Yes 17,163d 56.43de 165.1d Untreated --- --- 1.25 No Yes 16,901d 56.08de 158.9d Poncho 250 0.25 mg ST 1.25 No No 11,587e 55.93de 107.8e Untreated --- --- 1.25 No No 10,019e 54.75e 90.3e LSD (0.05) 2,947 2.88 30.4 P <0.0001 0.0021 <0.0001 Means sharing a common letter are not statistically different (LSD, P > 0.05). ST, seed treatment, applied commercially. Corn was planted at either 1.25 or 2 inch depth. Planter press wheels were adjusted for either optimum seed to soil contact or no seed to soil contact leaving an open seed trench. Labeled rates of pre-emergence herbicides, Epic DF and Aatrex-Nine-O were applied immediately after planting. Plots were machine harvested on 11-12 October. Percent moisture and lbs of grain were recorded and converted to 56 lbs/bu at 15.5% moisture. Yields were also corrected for 0.17% handling shrinkage for every moisture percentage point above 15.5% grain moisture. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

LARVAL WIREWORM CONTROL, 2004C

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2155-9856
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10.1093/amt/30.1.F18
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Abstract

(F18) CORN (FIELD): Zea mays L. ‘NC+ 5433RB’ Terry DeVries University of Nebraska-Lincoln South Central Agricultural Laboratory 842 Road 313, P.O. Box 66 Clay Center, NE 68933 Phone: (402) 762-4405 Fax: (402) 762-4411 E-mail: tdevries1@unl.edu Robert J. Wright University of Nebraska-Lincoln 202 Plant Industry Bldg. Dept. of Entomology Lincoln NE 68583-0816 E-mail: rwright2@unl.edu Wireworm (WW); Melanotus sp. The interaction of seed treatments, planting depth, press wheel adjustment and pre-emergence herbicide applications were evaluated for their impacts on yield and effectiveness against larval wireworm on a Crete silt loam at Clay Center, NE. Experimental design was a RCB with 4 replicates. Each plot consisted of a single 50 ft row with 30-inch spacing between rows. The field was planted to soybeans during the 2003 growing season. ‘NC+ 5433RB’ hybrid field corn was planted (N-S row orientation) on 19 Apr with a 2-row JD Maximerge planter with finger pickup seed metering units. Soil temperature at 4 inches was 60ºF at planting. Seed treatments were commercially applied (ST). Corn was planted either at a 1.25 or 2 inch depth. Planter press wheels were adjusted for either optimum seed to soil contact or positioned upwards so that no seed to soil contact occurred (open seed trench). Immediately after planting, labeled rates of pre-emergence (PRE) herbicides (Epic DF and Aatrex-Nine-O) were broadcast over the north ½ of the test site. Precipitation on 22 Apr (0.50 inches) and 24 Apr (0.35 inches) moved loose soil into the open seed trenches and covered the seed. Established plant populations were evaluated on 12 May. The total number of plants were recorded for each plot and converted to plants per acre (PPA). On 3 Jun, a post-emergence herbicide application of RoundUp WeatherMax was broadcast over the entire test site. Extended leaf heights (ELHs) were evaluated on 24 Jun. ELHs were recorded from 20 randomly selected plants in the middle of each plot. Plots were machine harvested on 11-12 Oct. Percent moisture and lbs of grain were recorded and corrected to 56 lbs/bu at 15.5% moisture. Yield levels were also corrected for 0.17% handling shrinkage for every moisture percentage point above 15.5% grain moisture. Data were analyzed using ANOVA with mean separation using Fisher’s protected LSD (P ≤ 0.05). Wireworm injury was very low at the test site but enough to measure the differences among treatments. No herbicide injury was observed. Minor rodent and/or bird feeding damage was observed in some plots in which the seed trench was not closed. In general, the major factor limiting PPA, ELHs and yield levels was press wheel adjustment. Optimum seed to soil contact statistically enhanced PPA, ELH and yield. Further, a 2-inch planting depth in combination with no seed to soil contact resulted in both significantly greater PPA and yield compared to a planting depth of 1.25 inches with no seed to soil contact. Optimum PRE Avg Treatment/ Rate amt planting Press wheel herbicide Avg ELH Yield a b c d formulation product/kernel Placement depth adjustment application PPA (inches) (bu/acre) Poncho 250 0.25 mg ST 1.25 Yes No 31,363a 60.75a 253.1a Poncho 250 0.25 mg ST 2 Yes Yes 31,102a 60.65a 251.2ab Poncho 250 0.25 mg ST 1.25 Yes Yes 30,666a 60.05ab 249.7ab Untreated --- --- 1.25 Yes No 30,579a 59.65abc 249.1ab Untreated --- --- 2 Yes Yes 29,882ab 58.23abcd 247.1ab Poncho 250 0.25 mg ST 2 Yes No 29,882ab 58.10abcd 244.4ab Untreated --- --- 2 Yes No 29,185ab 57.88abcd 242.7ab Poncho 250 0.25 mg ST 2 No No 29,098ab 57.20bcde 233.2ab Untreated --- --- 1.25 Yes Yes 29,011ab 57.05cde 225.7abc Poncho 250 0.25 mg ST 2 No Yes 28,924ab 57.05cde 224.9abc Untreated --- --- 2 No Yes 27,530bc 56.88cde 222.5bc Untreated --- --- 2 No No 25,439c 56.85cde 196.2c Poncho 250 0.25 mg ST 1.25 No Yes 17,163d 56.43de 165.1d Untreated --- --- 1.25 No Yes 16,901d 56.08de 158.9d Poncho 250 0.25 mg ST 1.25 No No 11,587e 55.93de 107.8e Untreated --- --- 1.25 No No 10,019e 54.75e 90.3e LSD (0.05) 2,947 2.88 30.4 P <0.0001 0.0021 <0.0001 Means sharing a common letter are not statistically different (LSD, P > 0.05). ST, seed treatment, applied commercially. Corn was planted at either 1.25 or 2 inch depth. Planter press wheels were adjusted for either optimum seed to soil contact or no seed to soil contact leaving an open seed trench. Labeled rates of pre-emergence herbicides, Epic DF and Aatrex-Nine-O were applied immediately after planting. Plots were machine harvested on 11-12 October. Percent moisture and lbs of grain were recorded and converted to 56 lbs/bu at 15.5% moisture. Yields were also corrected for 0.17% handling shrinkage for every moisture percentage point above 15.5% grain moisture.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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