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(F40) COTTON: Gossypium hirsutum (L.), ‘Delta Pine Delta Pearl’ EFFICACY OF SELECTED INSECTICIDES AGAINST TARNISHED PLANT BUG ON COTTON, 2004 D. R. Cook LSU AgCenter Northeast Research Station St. Joseph, LA 71366 Phone: (318) 766-3769 Fax: (318) 766-4278 E-mail: dcook@agcenter.lsu.edu D. R. Burns E. Burris Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) Cotton seed were planted on a Commerce silt loam soil on 8 Jul. Plot size was four rows (centered on 40 inches) by 50 feet. Treatments (Table 1) were replicated four times in a RCB design. Treatments were applied on 24 Sep with a high clearance sprayer and CO charged spray system calibrated to deliver 10 gpa through Teejet TX-12 hollow cone nozzles (2 per row). Treatment efficacy was determined by sampling the center two rows of each plot with a sweep net (25 sweeps/row) at 3, 5 and 7 DAT. Data were subjected to ANOVA and means separated according to Fisher’s Protected LSD (P ≤ 0.05). A total of 0.04 inches of rainfall occurred from the application date until the end of sampling. There were no significant differences among treatments for TPB adults at 3, 5, or 7 DAT, or across sample dates (Table 1). However, all insecticide treatments significantly reduced TPB nymphs compared to the non-treated control at all sampling dates and for the season (Table 1). Plots treated with Vydate, Orthene, or Bidrin had significantly fewer TPB nymphs compared to plots treated with Intruder at 3 DAT. At 5 DAT, Bidrin significantly reduced densities of TPB nymphs compared to Trimax, Intruder, or Diamond. Plots treated with Orthene or Bidrin had significantly fewer of TPB nymphs compared to plots treated with Trimax or Intruder in overall comparison across sample dates. No phytotoxicity was observed with any of the insecticide treatments in this test. Table 1. Tarnished plant bugs / 25 sweeps 3 DAT 5 DAT 7 DAT Season means Treatment/ Rate formulation lb (AI)/acre Adults Nymphs Adults Nymphs Adults Nymphs Adults Nymphs Centric 40WG 0.05 1.4a 4.6bc 3.6a 4.0bc 1.9a 5.5b 2.3a 4.7bcd Trimax 4F 0.047 3.0a 5.3bc 2.5a 6.1b 1.1a 6.1b 2.2a 5.8bc Vydate 3.77L 0.33 2.3a 3.4c 3.2a 3.9bc 3.6a 3.7b 3.0a 3.8cd Orthene 90S 0.33 2.9a 2.6c 2.0a 3.6bc 3.5a 3.9b 2.8a 3.4d Bidrin 8E 0.33 1.5a 2.6c 2.8a 1.6c 3.4a 3.4b 2.5a 2.5d Intruder 70WP 0.05 2.6a 7.0b 3.8a 5.5b 3.8a 6.5b 3.4a 6.3b Diamond 0.83EC 0.045 2.6a 3.9bc 2.4a 5.3b 3.0a 4.8b 2.7a 4.6bcd Untreated check --- 2.9a 11.1a 2.9a 10.0a 2.5a 13.4a 2.8a 10.8a P > F 0.22 <0.01 0.72 <0.01 0.13 <0.01 0.76 <0.01 Means within columns sharing a common letter are not significantly different based on an F-protected LSD (P > 0.05). Means across all sample dates.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2005
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