Arthropod Management Tests, 2017, 1–2 doi: 10.1093/amt/tsx080 Section F: Field & Cereal Crops PEANUT: Arachis hypogaea L. Acaricidal Control of Twospotted Spider Mites in Peanut, 2016 1,2 3 William H. Gay and Mark R. Abney Department of Entomology, University of Georgia, 222 Rockhouse Rd., Ashburn, GA 31714, Phone: (229) 567-3448, 2 3 Fax: (229) 567-0135 (email@example.com), Corresponding author, e-mail: firstname.lastname@example.org, and Department of Entomology, University of Georgia, 2360 Rainwater Rd., Tifton, GA 31793 (email@example.com) Subject Editor: Clyde Sorenson TwoSpotted Spider Mite (TSSM): Tetranychus urticae (Koch) Peanut (groundnut) j Arachis hypogaea twospotted spider mite j Tetranychus urticae The twospotted spider mite (TSSM) is an important peanut pest were sampled 1 day before application and 1, 4, 7, and 13 days af- due to feeding damage that can result in plant stress and reduced ter application. All data were collected from the two middle rows yield especially in hot, dry conditions. A trial was conducted to of each plot. All data were subjected to ANOVA for treatment ef- evaluate efficacy of miticides on TSSM eggs and crawlers in pea- fects. Means were separated using Fisher’s LSD (P 0.05) and are nut. This trial was conducted from 17 to 31 Aug in Wilcox presented in Table 1. County, GA, in a nonirrigated, commercial peanut field that expe- Use of nonionic surfactant with Agri Mek resulted in signifi- rienced moderate to severe drought stress from Jun until harvest. cantly fewer TSSM crawlers 7 and 13 DAT, and fewer TSSM eggs An RCB split plot design was used to evaluate the main plot factor 13 DAT compared to Agri Mek alone. The addition of a nonionic of miticide and the subplot factor of surfactant. Main plots were 8- surfactant to all other treatments did not affect populations of row wide and 25-ft long and were replicated four times on single TSSM eggs and crawlers when compared to the miticide treatments row peanuts seeded at a rate of approximately 7 seed per ft with alone. Portal þ NIS significantly reduced TSSM crawlers 4 DAT 36 inch between row spacing. Treatments were applied on 18 Aug compared to all other treatments except Portal alone, and Comite using a CO pressurized backpack sprayer with a 6-ft spray width II þBifenture. Comite II þ NIS, Comite II þ Bifenture, Comite operating at 4.2 mph and 35 psi with four nozzles (Conejet TXVS II þ Bifenture þ NIS, Portal, Portal þNIS, and Agri Mek þ NIS sig- 26) delivering 20 gpa. TSSM populations were sampled by collect- nificantly reduced TSSM eggs and crawlers at 13 DAT compared to ing 10 quadrifoliate leaves at random from each plot on each sam- the check, Bifenture, and Bifenture þ NIS. Bifenture did not cause a ple date. A single leaflet from the same position on each leaf was significant reduction of TSSM eggs or crawlers compared to the removed, and eggs and crawlers on 50% of the lower surface of check. Comite II þ Bifenture did not reduce TSSM populations each leaflet were counted using a dissecting microscope. Mites when compared to the use of Comite II alone. V C The Author 2017. 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 Downloaded from https://academic.oup.com/amt/article-abstract/42/1/tsx080/3858131 firstname.lastname@example.org by Ed 'DeepDyve' Gillespie user on 07 June 2018 2 Arthropod Management Tests, 2017, Vol. 42, No. 1 Table 1 Twospotted spider mites/leaf area sampled 19-Aug 22-Aug 25-Aug 31-Aug Treatment/formulation Rate amt/acre 1 DAT 4 DAT 7 DAT 13 DAT — Crawlers Eggs Crawlers Eggs Crawlers Eggs Crawlers Eggs Check — 86.7a 362.0a 59.2a 341.0ab 105.2a 222.6a 279.0a 179.8a Comite II EC 36 oz 62.2a 365.8a 10.4bcd 10.0b 1.1b 8.0b 4.9c 24.4ab Comite II EC þ 36 oz 84.6a 545.0a 9.2bcd 38.1ab 5.4b 32.3ab 1.3c 5.8b NIS SL 1% v/v Comite II EC þ 36 oz 50.5a 306.5a 5.7cde 12.3b 1.8b 10.7b 1.7c 2.5b Bifenture EC 6 oz Comite II EC þ 36 oz 60.4a 471.8a 17.7abc 46.8ab 2.7b 26.9ab 4.9c 15.3b Bifenture EC þ 6oz NIS SL 1% v/v Bifenture EC 6 oz 125.7a 405.0a 44.1ab 473.3a 162.8a 384.4a 127.1ab 205.7a Bifenture EC þ 6 oz 73.7a 341.8a 38.7ab 350.7ab 145.4a 379.9a 110.8ab 183.7a NIS SL 1% v/v Agri Mek EC 3.5 oz 75.3a 296.8a 41.5ab 31.1ab 48.3a 78.6ab 36.0b 141.4a Agri Mek EC þ 3.5 oz 62.9a 531.0a 15.6a-d 30.7ab 4.1b 18.9ab 0.2c 1.5b NIS SL 1% v/v Portal EC 32 oz 37.4a 292.5a 2.8de 32.5ab 1.6b 41.0ab 4.6c 11.7b Portal EC þ 32 oz 33.4a 225.0a 1.0e 19.6ab 2.0b 26.4ab 3.1c 6.9b NIS SL 1% v/v Means in a column followed by the same letter are not signiﬁcantly different (P> 0.05, Fisher’s LSD). Downloaded from https://academic.oup.com/amt/article-abstract/42/1/tsx080/3858131 by Ed 'DeepDyve' Gillespie user on 07 June 2018
Arthropod Management Tests – Oxford University Press
Published: May 29, 2017
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