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Arthropod Management Tests, 2015, 1–2 doi: 10.1093/amt/tsv158 (F29) ALFALFA: Medicago sativa L. ‘CUF-101’ Insecticide Efficacy Against Spotted Alfalfa Aphid, 2014a* Eric T. Natwick and Martin I. Lopez 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 (etnatwick@ucdavis.edu; marlopez@ucdavis. edu) and Corresponding author, e-mail: etnatwick@ucdavis.edu Subject Editor: Donald Cook Alfalfa | Medicago sativa spotted alfalfa aphid | Therioaphis trifolii forma O,O-Diethyl 0-3,5,6-trichloro-2-pyridyl phosphorothioate; and (R)-cyano (3-phenoxyphenyl) methyl (1S,3S)-rel-3-[(1Z)-2- chloro-3,3,3-trifluoro-1-propen-1-yl]-2,2-dimethylcyclopropanecarboxylate; O,O-diethyl- O-(3,5,6-trichloro-2-pyridinyl) phosphorothioate; N-[methyloxido[1-[6-(trifluoromethyl)-3-pyridinyl]ethyl]-k4-sulfanylidene] cyanamide; 4-[[(6-chloro-3- pyridinyl)methyl](2,2-difluoroethyl)amino]-2(5H)-furanone; 3-bromo-N-[2-bromo-4-chloro-6-[[(1-cyclopropylethyl)amino]- carbonyl]phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide; N-(cyanomethyl)-4-(trifluoromethyl)-3-pyridinecar- boxamide; (E)- N1 -[(6-chloro-3-pyridyl)methyl]-N2-cyano-N1-methyl acetamidine The objective of the study was to evaluate the efficacy of the new laboratory. Data sets were analyzed using a two-way ANOVA and old insecticidal compounds used against SAA on alfalfa and means separated by Tukey’s honestly significant difference grown for hay production under desert growing conditions. A test (P 0.05). field study was conducted during the spring of 2014 at the UC The 2014 SAA levels were typical of what is found in Imperial Desert Research and Extension Center. A stand of alfalfa, ‘CUF Valley alfalfa during early-Feb to mid-Feb. There were no differ- 101’, was used for the experiment. The experimental design was ences among the treatment means for SAA on 4 Feb, 1 DPT an RCB using four replicates with 12 insecticidal treatments and (Table 1). All insecticide treatments resulted in SAA means that an untreated check. Plots measured 13.33 ft by 50 ft and insecti- were significantly lower than the untreated check, the Cyclaniliprole cide treatments were applied on 5 Feb 2014, using a ground 50SL treatments, and all Assail 30WG treatments at 5 DAT and 7 broadcast application with a handheld CO backpack sprayer DAT (Table 1). Only the insecticide treatments of Cyclaniliprole with a boom covering a 13.33 ft swath operated at 30 psi, deliver- 50SL at 16.4 oz/acre and at 20 oz/acre did not reduce SAA com- ing 20 gpa through 10 (TJ-80015) nozzles. The SAA population pared to the untreated check at 14 DAT. Only the insecticide treat- wasmeasuredineachplotwithastandard 15-inch-diameterin- ments of Lorsban Advanced, Transform WG at 1.5 oz/acre and sect net consisting of ten 180 sweeps; means reported in the ta- Assail 30WG at 7 oz/acre significantly reduced SAA compared to bles are per sweep. Pretreatment samples were collected on 4 Feb, the untreated check at 21 DAT. All insecticide treatments resulted in and indicated as 1 DPT in the table. Posttreatment samples were PTAs for SAA that were lower than the untreated check, except collected on 10 Feb or 5 days after treatment (DAT), 12 Feb (7 Cyclaniliprole 50SL at 16.4 oz/acre and at 20 oz/acre and Assail DAT), 19Feb(14DAT), and 26Feb(21DAT). Sweepsamples 30WG at 5 oz/acre. None of the insecticide treatments resulted in were bagged, labeled, and frozen for later counting of SAA in the any injury to the alfalfa plants. * This research was supported by industry gifts of products and research funding. V C The Author 2015. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com 2 Arthropod Management Tests, 2015, Vol. 40, No. 1 Table 1 SAA per 10 sweeps Treatment/ Rate w xz z z z yz formulation amt/acre 1 DPT 5 DAT 7 DAT 14 DAT 21 DAT PTA Check ——– 143.75 a 266.79 a 405.54 a 451.06 a 9.46 a 341.69 a Cobalt Advanced 26.0 fl oz 251.25 a 1.21 e 2.16 e 5.91 b 1.00 abc 3.74 de Lorsban Advanced 26.0 fl oz 165.75 a 2.20 e 8.32 b-e 2.83 b 0.41 c 3.96 de Transform 50WG 0.75 oz 141.50 a 0.68 e 9.71 b-e 0.56 b 0.93 abc 4.30 de Transform 50WG 1.50 oz 177.50 a 2.94 de 3.28 de 7.63 b 0.00 c 4.99 de Sivanto 200SL 7.0 fl oz 195.25 a 7.75 cde 5.16 cde 1.34 b 1.40 abc 5.85 cde Sivanto 200SL 10.0 fl oz 189.00 a 2.31 e 3.24 de 2.31 b 1.03 abc 2.75 e Cyclaniliprole 50SL 16.4 fl oz 118.50 a 196.47 ab 94.96 abc 212.21 a 4.01 abc 141.00 ab Cyclaniliprole 50SL 20.0 fl oz 180.00 a 63.95 abc 188.23 a 224.22 a 8.96 ab 149.49 ab Cyclaniliprole 50SLþ Beleaf 50SG 10.9 fl oz 1.71 oz 156.75 a 50.86 a-d 30.77 a-e 2.03 b 0.78 abc 25.54 bcd Assail 30SG 3.0 oz 260.50 a 53.78 a-d 62.55 a-d 7.45 b 1.38 abc 40.54 bc Assail 30SG 5.0 oz 161.75 a 73.61 abc 105.17 ab 7.92 b 0.56 bc 57.38 ab Assail 30SG 7.0 oz 237.00 a 16.56 b-e 56.58 a-d 14.20 b 0.41 c 26.54 bcd Means within columns followed by the same letter are not significantly different, Tukey’s honestly significant difference test; P> 0.05. Days pretreatment. Days after treatment. Posttreatment average. Log (Xþ 1) transformed data used for analysis, back transformed means shown in the table.
Arthropod Management Tests – Oxford University Press
Published: Dec 31, 2015
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