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EVALUATION OF EFFICAY OF SELECTED INSECTICIDES AGAINST FALL ARMYWORMS IN PASTURES, 2012

EVALUATION OF EFFICAY OF SELECTED INSECTICIDES AGAINST FALL ARMYWORMS IN PASTURES, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F51 (G22) BERMUDAGRASS (PASTURE): (Cynodon dactylon) TALL FESCUE (PASTURE): (Festuca arundinacea) EVALUATION OF EFFICAY OF SELECTED INSECTICIDES AGAINST FALL ARMYWORMS IN PASTURES, 2012 Jared S. Chapman LSU Agricultural Center Department of Entomology 212A Macon Ridge Rd. Winnsboro, LA 71295 Office (318)435-2157 Email Jchapman@agcenter.lsu.edu K.D. Emfinger kemfinger@agcenter.lsu.edu T. Shelby Williams Twilliams@agcenter.lsu.edu D. Kerns Dkerns@agcenter.lsu.edu Fall armyworm (FAW): Spodoptera fruigiperda (J.E. Smith) Selected foliar insecticides were evaluated for control of FAW in pasture at the Macon Ridge Research Station in Franklin Parish near Winnsboro, LA. The test was initiated on 23 Jul 2012. Plot size was 13.33 ft × 40 ft. Treatments were arranged in a RCB design. Insecticides were applied by John Deere 6000 high cycle calibrated to deliver 10 gpa with TX-8 hollow cone at 55 psi compressed CO on 23 Jul. FAW larvae populations were assessed by taking by 25 sweeps/plot with a standard 15 inch sweep net. FAW larvae were separated based on size, small and large. Percent control was calculated based on a Henderson-Tilton formula. Evaluations were conducted on 23, 26 and 30 Jul (0, 3 and 7 DAT). Data were analyzed using an F protected LSD (P < 0.05). Pre-treatment counts of FAW larvae on 23 Jul averaged 37.46, 20.92, and 58.38 large, small and total larvae per 25 sweeps respectively. At 3 DAT there were no differences among treatments for small larvae and only Declare and Prevathon had fewer large and total FAW larvae compared to the untreated. Based on analysis of calculated percent control at 3 DAT, all of the treatments provided significant control with the exception of Dimilin. Dimilin is an IGR so control at 3 DAT isn’t expected. By 7 DAT the FAW population had declined across the entire test and no significant differences could be detected. Table 1. Number of FAW per 25 sweeps Jul 23(Pretreatment) Jul 26 (3 DAT) Jul 30 (7 DAT) Treatment/ Rate formulation fl oz/acre Large Small Total Large Small Total % control Large Small Total % control Untreated --- 39.25a 12.75a 52.00a 26.0 0a 1.00a 27.00a 0.00a 0.25a 0.25a 0.50a 0.00a Baythroid XL 1 EC 2.8 36.50a 12.75a 49.75a 10.25a 0.00a 10.25a 61.08b 0.50a 0.25a 0.75a 25.00a Karate Z 2.08 EC 1.92 44.75a 29.00a 73.75a 13.25a 0.75a 14.00a 61.45b 0.50a 0.50a 1.00a 0.00a Dimilin 4L 2.0 24.25a 26.75a 51.00a 10.75a 2.00a 12.75a 43.58a 0.25a 0.25a 0.50a 25.00a Declare 1.25 EC 1.54 44.25a 21.00a 65.25a 5.25b 1.50a 6.75b 78.81b 0.25a 0.75a 1.00a 0.00a Prevathon 0.43 SC 14.0 35.75a 23.25a 59.00a 6.25b 1.25a 7.75b 65.43b 0.00a 0.25a 0.25a 25.00a Values in a column followed by the same letter are not different based an F protected LSD (P ≥ 0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF EFFICAY OF SELECTED INSECTICIDES AGAINST FALL ARMYWORMS IN PASTURES, 2012

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Oxford University Press
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10.4182/amt.2013.G22
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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F51 (G22) BERMUDAGRASS (PASTURE): (Cynodon dactylon) TALL FESCUE (PASTURE): (Festuca arundinacea) EVALUATION OF EFFICAY OF SELECTED INSECTICIDES AGAINST FALL ARMYWORMS IN PASTURES, 2012 Jared S. Chapman LSU Agricultural Center Department of Entomology 212A Macon Ridge Rd. Winnsboro, LA 71295 Office (318)435-2157 Email Jchapman@agcenter.lsu.edu K.D. Emfinger kemfinger@agcenter.lsu.edu T. Shelby Williams Twilliams@agcenter.lsu.edu D. Kerns Dkerns@agcenter.lsu.edu Fall armyworm (FAW): Spodoptera fruigiperda (J.E. Smith) Selected foliar insecticides were evaluated for control of FAW in pasture at the Macon Ridge Research Station in Franklin Parish near Winnsboro, LA. The test was initiated on 23 Jul 2012. Plot size was 13.33 ft × 40 ft. Treatments were arranged in a RCB design. Insecticides were applied by John Deere 6000 high cycle calibrated to deliver 10 gpa with TX-8 hollow cone at 55 psi compressed CO on 23 Jul. FAW larvae populations were assessed by taking by 25 sweeps/plot with a standard 15 inch sweep net. FAW larvae were separated based on size, small and large. Percent control was calculated based on a Henderson-Tilton formula. Evaluations were conducted on 23, 26 and 30 Jul (0, 3 and 7 DAT). Data were analyzed using an F protected LSD (P < 0.05). Pre-treatment counts of FAW larvae on 23 Jul averaged 37.46, 20.92, and 58.38 large, small and total larvae per 25 sweeps respectively. At 3 DAT there were no differences among treatments for small larvae and only Declare and Prevathon had fewer large and total FAW larvae compared to the untreated. Based on analysis of calculated percent control at 3 DAT, all of the treatments provided significant control with the exception of Dimilin. Dimilin is an IGR so control at 3 DAT isn’t expected. By 7 DAT the FAW population had declined across the entire test and no significant differences could be detected. Table 1. Number of FAW per 25 sweeps Jul 23(Pretreatment) Jul 26 (3 DAT) Jul 30 (7 DAT) Treatment/ Rate formulation fl oz/acre Large Small Total Large Small Total % control Large Small Total % control Untreated --- 39.25a 12.75a 52.00a 26.0 0a 1.00a 27.00a 0.00a 0.25a 0.25a 0.50a 0.00a Baythroid XL 1 EC 2.8 36.50a 12.75a 49.75a 10.25a 0.00a 10.25a 61.08b 0.50a 0.25a 0.75a 25.00a Karate Z 2.08 EC 1.92 44.75a 29.00a 73.75a 13.25a 0.75a 14.00a 61.45b 0.50a 0.50a 1.00a 0.00a Dimilin 4L 2.0 24.25a 26.75a 51.00a 10.75a 2.00a 12.75a 43.58a 0.25a 0.25a 0.50a 25.00a Declare 1.25 EC 1.54 44.25a 21.00a 65.25a 5.25b 1.50a 6.75b 78.81b 0.25a 0.75a 1.00a 0.00a Prevathon 0.43 SC 14.0 35.75a 23.25a 59.00a 6.25b 1.25a 7.75b 65.43b 0.00a 0.25a 0.25a 25.00a Values in a column followed by the same letter are not different based an F protected LSD (P ≥ 0.05).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2013

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