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INSECTICIDE EFFICACY: ALFALFA WEEVIL IN ALFALFA, 2012

INSECTICIDE EFFICACY: ALFALFA WEEVIL IN ALFALFA, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F4 (F4) ALFALFA: Medicago sativa L. ‘CUF-101’ Eric T. Natwick University of California Agriculture and Natural Resources Desert Research and Extension Center 1050 E. Holton Rd. Holtville, CA 92250 Phone: (760) 352-9474 Fax: (760) 352-0846 E-mail: etnatwick@ucdavis.edu Martin I. Lopez E-mail: marlopez@ucdavis.edu Egyptian alfalfa weevil (EAW): Hypera brunnipennis (Boheman) The objective of the study was to evaluate the efficacy of the new and old insecticidal compounds used against EAW larvae on alfalfa grown for hay production under desert growing conditions. The study was conducted during the spring of 2011 at the UC Desert Research and Extension Center. The experimental design was RCB using four replicates with seven insecticidal treatments and an untreated check. Plots measured 20 ft by 50 ft and insecticide treatments were applied on 13 Mar 2012, using a broadcast application with a tractor mounted boom. Broadcast insecticide spray treatments were applied using a Lee Spider Spray Trac, tractor mounted spray boom, operated at 25 psi, delivering 36.1 gpa through 13 nozzles (TJ- 60 11003VS) in a 20 ft wide spray swath. The larval EAW population was measured in each plot with a standard 15-inch diameter insect net consisting of ten 180 sweeps. Pre-treatment samples were collected on 12 Mar, and indicated as 1DPT in the table. Post-treatment samples were collected on the following dates 16 Mar, 20 Mar, and 27 Mar and reported in the table as days after treatment (DAT), 3DAT, 7DAT, 14DAT, respectively. Sweep samples were bagged, labeled, and frozen for later counting of EAW larvae in the laboratory. Data sets were analyzed using a 2-way ANOVA and means separated by protected LSD (P ≤ 0.05). The 2012 EAW larvae levels were typical of what is found in Imperial Valley alfalfa during Mar. There were no differences among the means for EAW larvae on 12 Mar 1DPT (Table 1). All insecticide treatments had means for EAW larvae that were significantly lower than the means for the untreated check on all post-treatment sampling dates except for Centric on 20 Mar, 14DAT. Cobalt provided the highest level of EAW control and residual activity through 14DAT. None of the insecticide treatments showed any injury to the alfalfa plants. This research was supported by industry gifts. Table 1. EAW larvae per 10 Sweeps w xz z z yz Treatment Rate/acre 1DPT 3 DAT 7 DAT 14 DAT PTA Check --- 19.75 27.25a 22.00a 9.00a 19.42a Endigo 2.06 ZC 4.0 fl oz 27.25 1.00cd 0.25c 0.00d 0.42cd Endigo Zcx 2.71 ZC 4.0 fl oz 27.00 4.00bc 1.00c 0.25d 1.75bc Centric 40 WG 3.5 dry oz 26.00 5.00bc 6.75b 5.50ab 5.75b Voliam Xpress 1.25 ZC 9.0 fl oz 26.25 3.00cd 0.50c 1.75bcd 1.75bcd Cobalt 2.54 EC 24 fl oz 24.50 0.50d 0.25c 0.00d 0.25d Warrior Zeon 2.08 CS 1.92 fl oz 18.75 1.00d 0.50c 0.50cd 0.67cd Lorsban Advanced 32.0 fl oz 30.00 8.75b 3.00bc 3.00bc 4.92b Means within columns followed by the same letter are not significantly different, P>0.05, LSD. Pre-treatment Post treatment average. Log (X+1) transformed data were used for analysis, but actual means are reported. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

INSECTICIDE EFFICACY: ALFALFA WEEVIL IN ALFALFA, 2012

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Oxford University Press
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2155-9856
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10.4182/amt.2013.F4
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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F4 (F4) ALFALFA: Medicago sativa L. ‘CUF-101’ Eric T. Natwick University of California Agriculture and Natural Resources Desert Research and Extension Center 1050 E. Holton Rd. Holtville, CA 92250 Phone: (760) 352-9474 Fax: (760) 352-0846 E-mail: etnatwick@ucdavis.edu Martin I. Lopez E-mail: marlopez@ucdavis.edu Egyptian alfalfa weevil (EAW): Hypera brunnipennis (Boheman) The objective of the study was to evaluate the efficacy of the new and old insecticidal compounds used against EAW larvae on alfalfa grown for hay production under desert growing conditions. The study was conducted during the spring of 2011 at the UC Desert Research and Extension Center. The experimental design was RCB using four replicates with seven insecticidal treatments and an untreated check. Plots measured 20 ft by 50 ft and insecticide treatments were applied on 13 Mar 2012, using a broadcast application with a tractor mounted boom. Broadcast insecticide spray treatments were applied using a Lee Spider Spray Trac, tractor mounted spray boom, operated at 25 psi, delivering 36.1 gpa through 13 nozzles (TJ- 60 11003VS) in a 20 ft wide spray swath. The larval EAW population was measured in each plot with a standard 15-inch diameter insect net consisting of ten 180 sweeps. Pre-treatment samples were collected on 12 Mar, and indicated as 1DPT in the table. Post-treatment samples were collected on the following dates 16 Mar, 20 Mar, and 27 Mar and reported in the table as days after treatment (DAT), 3DAT, 7DAT, 14DAT, respectively. Sweep samples were bagged, labeled, and frozen for later counting of EAW larvae in the laboratory. Data sets were analyzed using a 2-way ANOVA and means separated by protected LSD (P ≤ 0.05). The 2012 EAW larvae levels were typical of what is found in Imperial Valley alfalfa during Mar. There were no differences among the means for EAW larvae on 12 Mar 1DPT (Table 1). All insecticide treatments had means for EAW larvae that were significantly lower than the means for the untreated check on all post-treatment sampling dates except for Centric on 20 Mar, 14DAT. Cobalt provided the highest level of EAW control and residual activity through 14DAT. None of the insecticide treatments showed any injury to the alfalfa plants. This research was supported by industry gifts. Table 1. EAW larvae per 10 Sweeps w xz z z yz Treatment Rate/acre 1DPT 3 DAT 7 DAT 14 DAT PTA Check --- 19.75 27.25a 22.00a 9.00a 19.42a Endigo 2.06 ZC 4.0 fl oz 27.25 1.00cd 0.25c 0.00d 0.42cd Endigo Zcx 2.71 ZC 4.0 fl oz 27.00 4.00bc 1.00c 0.25d 1.75bc Centric 40 WG 3.5 dry oz 26.00 5.00bc 6.75b 5.50ab 5.75b Voliam Xpress 1.25 ZC 9.0 fl oz 26.25 3.00cd 0.50c 1.75bcd 1.75bcd Cobalt 2.54 EC 24 fl oz 24.50 0.50d 0.25c 0.00d 0.25d Warrior Zeon 2.08 CS 1.92 fl oz 18.75 1.00d 0.50c 0.50cd 0.67cd Lorsban Advanced 32.0 fl oz 30.00 8.75b 3.00bc 3.00bc 4.92b Means within columns followed by the same letter are not significantly different, P>0.05, LSD. Pre-treatment Post treatment average. Log (X+1) transformed data were used for analysis, but actual means are reported.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2013

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